CMAKE-VARIABLES(7) CMake CMAKE-VARIABLES(7)

cmake-variables - CMake Variables Reference

This page documents variables that are provided by CMake or have meaning to CMake when set by project code.

For general information on variables, see the Variables section in the cmake-language manual.

NOTE:

CMake reserves identifiers that:
  • begin with CMAKE_ (upper-, lower-, or mixed-case), or
  • begin with _CMAKE_ (upper-, lower-, or mixed-case), or
  • begin with _ followed by the name of any CMake Command.

Name of archiving tool for static libraries.

This specifies the name of the program that creates archive or static libraries.

Number of command line arguments passed to CMake in script mode.

When run in -P script mode, CMake sets this variable to the number of command line arguments. See also CMAKE_ARGV0, 1, 2 ...

Command line argument passed to CMake in script mode.

When run in -P script mode, CMake sets this variable to the first command line argument. It then also sets CMAKE_ARGV1, CMAKE_ARGV2, ... and so on, up to the number of command line arguments given. See also CMAKE_ARGC.

The path to the top level of the build tree.

This is the full path to the top level of the current CMake build tree. For an in-source build, this would be the same as CMAKE_SOURCE_DIR.

When run in -P script mode, CMake sets the variables CMAKE_BINARY_DIR, CMAKE_SOURCE_DIR, CMAKE_CURRENT_BINARY_DIR and CMAKE_CURRENT_SOURCE_DIR to the current working directory.

This variable exists only for backwards compatibility. It contains the same value as CMAKE_MAKE_PROGRAM. Use that variable instead.

Major version of CMake used to create the CMakeCache.txt file

This stores the major version of CMake used to write a CMake cache file. It is only different when a different version of CMake is run on a previously created cache file.

Minor version of CMake used to create the CMakeCache.txt file

This stores the minor version of CMake used to write a CMake cache file. It is only different when a different version of CMake is run on a previously created cache file.

Patch version of CMake used to create the CMakeCache.txt file

This stores the patch version of CMake used to write a CMake cache file. It is only different when a different version of CMake is run on a previously created cache file.

The directory with the CMakeCache.txt file.

This is the full path to the directory that has the CMakeCache.txt file in it. This is the same as CMAKE_BINARY_DIR.

Deprecated since version 3.21: This variable has poor support on Ninja Multi-Config, and predates the existence of the $<CONFIG> generator expression. Use $<CONFIG> instead.

Build-time reference to per-configuration output subdirectory.

For native build systems supporting multiple configurations in the build tree (such as Visual Studio Generators and Xcode), the value is a reference to a build-time variable specifying the name of the per-configuration output subdirectory. On Makefile Generators this evaluates to . because there is only one configuration in a build tree. Example values:

$(ConfigurationName) = Visual Studio 9
$(Configuration)     = Visual Studio 10
$(CONFIGURATION)     = Xcode
.                    = Make-based tools
.                    = Ninja
${CONFIGURATION}     = Ninja Multi-Config

Since these values are evaluated by the native build system, this variable is suitable only for use in command lines that will be evaluated at build time. Example of intended usage:

add_executable(mytool mytool.c)
add_custom_command(
  OUTPUT out.txt
  COMMAND ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/mytool
          ${CMAKE_CURRENT_SOURCE_DIR}/in.txt out.txt
  DEPENDS mytool in.txt
  )
add_custom_target(drive ALL DEPENDS out.txt)

Note that CMAKE_CFG_INTDIR is no longer necessary for this purpose but has been left for compatibility with existing projects. Instead add_custom_command() recognizes executable target names in its COMMAND option, so ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/mytool can be replaced by just mytool.

This variable is read-only. Setting it is undefined behavior. In multi-configuration build systems the value of this variable is passed as the value of preprocessor symbol CMAKE_INTDIR to the compilation of all source files.

The full path to the cmake(1) executable.

This is the full path to the CMake executable cmake(1) which is useful from custom commands that want to use the cmake -E option for portable system commands. (e.g. /usr/local/bin/cmake)

New in version 3.13.

Full path to cpack(1) command installed with CMake.

This is the full path to the CPack executable cpack(1) which is useful from custom commands that want to use the cmake(1) -E option for portable system commands.

Intended to indicate whether CMake is cross compiling, but note limitations discussed below.

This variable will be set to true by CMake if the CMAKE_SYSTEM_NAME variable has been set manually (i.e. in a toolchain file or as a cache entry from the cmake command line). In most cases, manually setting CMAKE_SYSTEM_NAME will only be done when cross compiling, since it will otherwise be given the same value as CMAKE_HOST_SYSTEM_NAME if not manually set, which is correct for the non-cross-compiling case. In the event that CMAKE_SYSTEM_NAME is manually set to the same value as CMAKE_HOST_SYSTEM_NAME, then CMAKE_CROSSCOMPILING will still be set to true.

Another case to be aware of is that builds targeting Apple platforms other than macOS are handled differently to other cross compiling scenarios. Rather than relying on CMAKE_SYSTEM_NAME to select the target platform, Apple device builds use CMAKE_OSX_SYSROOT to select the appropriate SDK, which indirectly determines the target platform. Furthermore, when using the Xcode generator, developers can switch between device and simulator builds at build time rather than having a single choice at configure time, so the concept of whether the build is cross compiling or not is more complex. Therefore, the use of CMAKE_CROSSCOMPILING is not recommended for projects targeting Apple devices.

New in version 3.3.

This variable is only used when CMAKE_CROSSCOMPILING is on. It should point to a command on the host system that can run executable built for the target system.

If this variable contains a semicolon-separated list, then the first value is the command and remaining values are its arguments.

The command will be used to run try_run() generated executables, which avoids manual population of the TryRunResults.cmake file.

It is also used as the default value for the CROSSCOMPILING_EMULATOR target property of executables.

Full path to ctest(1) command installed with CMake.

This is the full path to the CTest executable ctest(1) which is useful from custom commands that want to use the cmake(1) -E option for portable system commands.

The path to the binary directory currently being processed.

This the full path to the build directory that is currently being processed by cmake. Each directory added by add_subdirectory() will create a binary directory in the build tree, and as it is being processed this variable will be set. For in-source builds this is the current source directory being processed.

When run in -P script mode, CMake sets the variables CMAKE_BINARY_DIR, CMAKE_SOURCE_DIR, CMAKE_CURRENT_BINARY_DIR and CMAKE_CURRENT_SOURCE_DIR to the current working directory.

New in version 3.17.

When executing code inside a function(), this variable contains the name of the current function. It can be useful for diagnostic or debug messages.

See also CMAKE_CURRENT_FUNCTION_LIST_DIR, CMAKE_CURRENT_FUNCTION_LIST_FILE and CMAKE_CURRENT_FUNCTION_LIST_LINE.

New in version 3.17.

When executing code inside a function(), this variable contains the full directory of the listfile that defined the current function.

It is quite common practice in CMake for modules to use some additional files, such as templates to be copied in after substituting CMake variables. In such cases, a function needs to know where to locate those files in a way that doesn't depend on where the function is called. Without CMAKE_CURRENT_FUNCTION_LIST_DIR, the code to do that would typically use the following pattern:

set(_THIS_MODULE_BASE_DIR "${CMAKE_CURRENT_LIST_DIR}")
function(foo)
  configure_file(
    "${_THIS_MODULE_BASE_DIR}/some.template.in"
    some.output
  )
endfunction()

Using CMAKE_CURRENT_FUNCTION_LIST_DIR inside the function instead eliminates the need for the extra variable which would otherwise be visible outside the function's scope. The above example can be written in the more concise and more robust form:

function(foo)
  configure_file(
    "${CMAKE_CURRENT_FUNCTION_LIST_DIR}/some.template.in"
    some.output
  )
endfunction()

See also CMAKE_CURRENT_FUNCTION, CMAKE_CURRENT_FUNCTION_LIST_FILE and CMAKE_CURRENT_FUNCTION_LIST_LINE.

New in version 3.17.

When executing code inside a function(), this variable contains the full path to the listfile that defined the current function.

See also CMAKE_CURRENT_FUNCTION, CMAKE_CURRENT_FUNCTION_LIST_DIR and CMAKE_CURRENT_FUNCTION_LIST_LINE.

New in version 3.17.

When executing code inside a function(), this variable contains the line number in the listfile where the current function was defined.

See also CMAKE_CURRENT_FUNCTION, CMAKE_CURRENT_FUNCTION_LIST_DIR and CMAKE_CURRENT_FUNCTION_LIST_FILE.

Full directory of the listfile currently being processed.

As CMake processes the listfiles in your project this variable will always be set to the directory where the listfile which is currently being processed (CMAKE_CURRENT_LIST_FILE) is located. The value has dynamic scope. When CMake starts processing commands in a source file it sets this variable to the directory where this file is located. When CMake finishes processing commands from the file it restores the previous value. Therefore the value of the variable inside a macro or function is the directory of the file invoking the bottom-most entry on the call stack, not the directory of the file containing the macro or function definition.

See also CMAKE_CURRENT_LIST_FILE.

Full path to the listfile currently being processed.

As CMake processes the listfiles in your project this variable will always be set to the one currently being processed. The value has dynamic scope. When CMake starts processing commands in a source file it sets this variable to the location of the file. When CMake finishes processing commands from the file it restores the previous value. Therefore the value of the variable inside a macro or function is the file invoking the bottom-most entry on the call stack, not the file containing the macro or function definition.

See also CMAKE_PARENT_LIST_FILE.

The line number of the current file being processed.

This is the line number of the file currently being processed by cmake.

If CMake is currently processing deferred calls scheduled by the cmake_language(DEFER) command, this variable evaluates to DEFERRED instead of a specific line number.

The path to the source directory currently being processed.

This the full path to the source directory that is currently being processed by cmake.

When run in -P script mode, CMake sets the variables CMAKE_BINARY_DIR, CMAKE_SOURCE_DIR, CMAKE_CURRENT_BINARY_DIR and CMAKE_CURRENT_SOURCE_DIR to the current working directory.

Enables tracing output for target properties.

This variable can be populated with a list of properties to generate debug output for when evaluating target properties. Currently it can only be used when evaluating:

  • AUTOUIC_OPTIONS
  • COMPILE_DEFINITIONS
  • COMPILE_FEATURES
  • COMPILE_OPTIONS
  • INCLUDE_DIRECTORIES
  • LINK_DIRECTORIES
  • LINK_OPTIONS
  • POSITION_INDEPENDENT_CODE
  • SOURCES

target properties and any other property listed in COMPATIBLE_INTERFACE_STRING and other COMPATIBLE_INTERFACE_ properties. It outputs an origin for each entry in the target property. Default is unset.

New in version 3.10.

Specify labels for the current directory.

This is used to initialize the LABELS directory property.

Name of library containing dlopen and dlclose.

The name of the library that has dlopen and dlclose in it, usually -ldl on most UNIX machines.

New in version 3.17.

Default value for DOTNET_TARGET_FRAMEWORK property of targets.

This variable is used to initialize the DOTNET_TARGET_FRAMEWORK property on all targets. See that target property for additional information.

Setting CMAKE_DOTNET_TARGET_FRAMEWORK may be necessary when working with C# and newer .NET framework versions to avoid referencing errors with the ALL_BUILD CMake target.

This variable is only evaluated for Visual Studio Generators VS 2010 and above.

New in version 3.12.

Default value for DOTNET_TARGET_FRAMEWORK_VERSION property of targets.

This variable is used to initialize the DOTNET_TARGET_FRAMEWORK_VERSION property on all targets. See that target property for additional information. When set, CMAKE_DOTNET_TARGET_FRAMEWORK takes precednece over this variable. See that variable or the associated target property DOTNET_TARGET_FRAMEWORK for additional information.

Setting CMAKE_DOTNET_TARGET_FRAMEWORK_VERSION may be necessary when working with C# and newer .NET framework versions to avoid referencing errors with the ALL_BUILD CMake target.

This variable is only evaluated for Visual Studio Generators VS 2010 and above.

Full path to cmake-gui(1) or ccmake(1). Defined only for Makefile Generators when not using an "extra" generator for an IDE.

This is the full path to the CMake executable that can graphically edit the cache. For example, cmake-gui(1) or ccmake(1).

The suffix for executables on this platform.

The suffix to use for the end of an executable filename if any, .exe on Windows.

CMAKE_EXECUTABLE_SUFFIX_<LANG> overrides this for language <LANG>.

The suffix to use for the end of an executable filename of <LANG> compiler target architecture, if any.

It overrides CMAKE_EXECUTABLE_SUFFIX for language <LANG>.

The extra generator used to build the project. See cmake-generators(7).

When using the Eclipse, CodeBlocks, CodeLite, Kate or Sublime generators, CMake generates Makefiles (CMAKE_GENERATOR) and additionally project files for the respective IDE. This IDE project file generator is stored in CMAKE_EXTRA_GENERATOR (e.g. Eclipse CDT4).

Additional suffixes for shared libraries.

Extensions for shared libraries other than that specified by CMAKE_SHARED_LIBRARY_SUFFIX, if any. CMake uses this to recognize external shared library files during analysis of libraries linked by a target.

New in version 3.17.

Print extra find call information for the following commands to standard error:

  • find_program()
  • find_library()
  • find_file()
  • find_path()
  • find_package()

Output is designed for human consumption and not for parsing. Enabling this variable is equivalent to using cmake --debug-find with the added ability to enable debugging for a subset of find calls.

set(CMAKE_FIND_DEBUG_MODE TRUE)
find_program(...)
set(CMAKE_FIND_DEBUG_MODE FALSE)

Default is unset.

New in version 3.1.1.

Defined by the find_package() command while loading a find module to record the caller-specified package name. See command documentation for details.

New in version 3.7.

The sorting direction used by CMAKE_FIND_PACKAGE_SORT_ORDER. It can assume one of the following values:

DEC
Default. Ordering is done in descending mode. The highest folder found will be tested first.
ASC
Ordering is done in ascending mode. The lowest folder found will be tested first.

If CMAKE_FIND_PACKAGE_SORT_ORDER is not set or is set to NONE this variable has no effect.

New in version 3.7.

The default order for sorting packages found using find_package(). It can assume one of the following values:

NONE
Default. No attempt is done to sort packages. The first valid package found will be selected.
NAME
Sort packages lexicographically before selecting one.
NATURAL
Sort packages using natural order (see strverscmp(3) manual), i.e. such that contiguous digits are compared as whole numbers.

Natural sorting can be employed to return the highest version when multiple versions of the same library are found by find_package(). For example suppose that the following libraries have been found:

  • libX-1.1.0
  • libX-1.2.9
  • libX-1.2.10

By setting NATURAL order we can select the one with the highest version number libX-1.2.10.

set(CMAKE_FIND_PACKAGE_SORT_ORDER NATURAL)
find_package(libX CONFIG)

The sort direction can be controlled using the CMAKE_FIND_PACKAGE_SORT_DIRECTION variable (by default decrescent, e.g. lib-B will be tested before lib-A).

The generator used to build the project. See cmake-generators(7).

The name of the generator that is being used to generate the build files. (e.g. Unix Makefiles, Ninja, etc.)

The value of this variable should never be modified by project code. A generator may be selected via the cmake(1) -G option, interactively in cmake-gui(1), or via the CMAKE_GENERATOR environment variable.

New in version 3.11.

Generator-specific instance specification provided by user.

Some CMake generators support selection of an instance of the native build system when multiple instances are available. If the user specifies an instance (e.g. by setting this cache entry or via the CMAKE_GENERATOR_INSTANCE environment variable), or after a default instance is chosen when a build tree is first configured, the value will be available in this variable.

The value of this variable should never be modified by project code. A toolchain file specified by the CMAKE_TOOLCHAIN_FILE variable may initialize CMAKE_GENERATOR_INSTANCE as a cache entry. Once a given build tree has been initialized with a particular value for this variable, changing the value has undefined behavior.

Instance specification is supported only on specific generators:

For the Visual Studio 15 2017 generator (and above) this specifies the absolute path to the VS installation directory of the selected VS instance.

See native build system documentation for allowed instance values.

New in version 3.1.

Generator-specific target platform specification provided by user.

Some CMake generators support a target platform name to be given to the native build system to choose a compiler toolchain. If the user specifies a platform name (e.g. via the cmake(1) -A option or via the CMAKE_GENERATOR_PLATFORM environment variable) the value will be available in this variable.

The value of this variable should never be modified by project code. A toolchain file specified by the CMAKE_TOOLCHAIN_FILE variable may initialize CMAKE_GENERATOR_PLATFORM. Once a given build tree has been initialized with a particular value for this variable, changing the value has undefined behavior.

Platform specification is supported only on specific generators:

  • For Visual Studio Generators with VS 2005 and above this specifies the target architecture.
  • For Green Hills MULTI this specifies the target architecture.

See native build system documentation for allowed platform names.

On Visual Studio Generators the selected platform name is provided in the CMAKE_VS_PLATFORM_NAME variable.

Native build system toolset specification provided by user.

Some CMake generators support a toolset specification to tell the native build system how to choose a compiler. If the user specifies a toolset (e.g. via the cmake(1) -T option or via the CMAKE_GENERATOR_TOOLSET environment variable) the value will be available in this variable.

The value of this variable should never be modified by project code. A toolchain file specified by the CMAKE_TOOLCHAIN_FILE variable may initialize CMAKE_GENERATOR_TOOLSET. Once a given build tree has been initialized with a particular value for this variable, changing the value has undefined behavior.

Toolset specification is supported only on specific generators:

  • Visual Studio Generators for VS 2010 and above
  • The Xcode generator for Xcode 3.0 and above
  • The Green Hills MULTI generator

See native build system documentation for allowed toolset names.

The Visual Studio Generators support toolset specification using one of these forms:
  • toolset
  • toolset[,key=value]*
  • key=value[,key=value]*

The toolset specifies the toolset name. The selected toolset name is provided in the CMAKE_VS_PLATFORM_TOOLSET variable.

The key=value pairs form a comma-separated list of options to specify generator-specific details of the toolset selection. Supported pairs are:

cuda=<version>|<path>
Specify the CUDA toolkit version to use or the path to a standalone CUDA toolkit directory. Supported by VS 2010 and above. The version can only be used with the CUDA toolkit VS integration globally installed. See the CMAKE_VS_PLATFORM_TOOLSET_CUDA and CMAKE_VS_PLATFORM_TOOLSET_CUDA_CUSTOM_DIR variables.
host=<arch>
Specify the host tools architecture as x64 or x86. Supported by VS 2013 and above. See the CMAKE_VS_PLATFORM_TOOLSET_HOST_ARCHITECTURE variable.
version=<version>
Specify the toolset version to use. Supported by VS 2017 and above with the specified toolset installed. See the CMAKE_VS_PLATFORM_TOOLSET_VERSION variable.
VCTargetsPath=<path>
Specify an alternative VCTargetsPath value for Visual Studio project files. This allows use of VS platform extension configuration files (.props and .targets) that are not installed with VS.

These are unstable interfaces with no compatibility guarantees because they hook into undocumented internal CMake implementation details. Institutions may use these to internally maintain support for non-public Visual Studio platforms and toolsets, but must accept responsibility to make updates as changes are made to CMake.

Additional key=value pairs are available:

customFlagTableDir=<path>
New in version 3.21.

Specify the absolute path to a directory from which to load custom flag tables stored as JSON documents with file names of the form <platform>_<toolset>_<tool>.json or <platform>_<tool>.json, where <platform> is the CMAKE_VS_PLATFORM_NAME, <toolset> is the CMAKE_VS_PLATFORM_TOOLSET, and <tool> is the tool for which the flag table is meant. This naming pattern is an internal CMake implementation detail. The <tool> names are undocumented. The format of the .json flag table files is undocumented.

The prefix for import libraries that you link to.

The prefix to use for the name of an import library if used on this platform.

CMAKE_IMPORT_LIBRARY_PREFIX_<LANG> overrides this for language <LANG>.

The suffix for import libraries that you link to.

The suffix to use for the end of an import library filename if used on this platform.

CMAKE_IMPORT_LIBRARY_SUFFIX_<LANG> overrides this for language <LANG>.

This variable is used to initialize the JOB_POOL_COMPILE property on all the targets. See JOB_POOL_COMPILE for additional information.
This variable is used to initialize the JOB_POOL_LINK property on all the targets. See JOB_POOL_LINK for additional information.

New in version 3.17.

This variable is used to initialize the JOB_POOL_PRECOMPILE_HEADER property on all the targets. See JOB_POOL_PRECOMPILE_HEADER for additional information.

New in version 3.11.

If the JOB_POOLS global property is not set, the value of this variable is used in its place. See JOB_POOLS for additional information.

New in version 3.9.

A wrapper around ar adding the appropriate --plugin option for the compiler.

See also CMAKE_AR.

New in version 3.9.

A wrapper around ranlib adding the appropriate --plugin option for the compiler.

See also CMAKE_RANLIB.

New in version 3.16.

Language-specific suffix for libraries that you link to.

The suffix to use for the end of a library filename, .lib on Windows.

The suffix for libraries that you link to.

The suffix to use for the end of a library filename, .lib on Windows.

New in version 3.4.

End a link line such that static system libraries are used.

Some linkers support switches such as -Bstatic and -Bdynamic to determine whether to use static or shared libraries for -lXXX options. CMake uses these options to set the link type for libraries whose full paths are not known or (in some cases) are in implicit link directories for the platform. By default CMake adds an option at the end of the library list (if necessary) to set the linker search type back to its starting type. This property switches the final linker search type to -Bstatic regardless of how it started.

This variable is used to initialize the target property LINK_SEARCH_END_STATIC for all targets. If set, its value is also used by the try_compile() command.

See also CMAKE_LINK_SEARCH_START_STATIC.

New in version 3.4.

Assume the linker looks for static libraries by default.

Some linkers support switches such as -Bstatic and -Bdynamic to determine whether to use static or shared libraries for -lXXX options. CMake uses these options to set the link type for libraries whose full paths are not known or (in some cases) are in implicit link directories for the platform. By default the linker search type is assumed to be -Bdynamic at the beginning of the library list. This property switches the assumption to -Bstatic. It is intended for use when linking an executable statically (e.g. with the GNU -static option).

This variable is used to initialize the target property LINK_SEARCH_START_STATIC for all targets. If set, its value is also used by the try_compile() command.

See also CMAKE_LINK_SEARCH_END_STATIC.

First version number component of the CMAKE_VERSION variable.

Tool that can launch the native build system. The value may be the full path to an executable or just the tool name if it is expected to be in the PATH.

The tool selected depends on the CMAKE_GENERATOR used to configure the project:

  • The Makefile Generators set this to make, gmake, or a generator-specific tool (e.g. nmake for NMake Makefiles).

    These generators store CMAKE_MAKE_PROGRAM in the CMake cache so that it may be edited by the user.

  • The Ninja generator sets this to ninja.

    This generator stores CMAKE_MAKE_PROGRAM in the CMake cache so that it may be edited by the user.

  • The Xcode generator sets this to xcodebuild.

    This generator prefers to lookup the build tool at build time rather than to store CMAKE_MAKE_PROGRAM in the CMake cache ahead of time. This is because xcodebuild is easy to find.

    For compatibility with versions of CMake prior to 3.2, if a user or project explicitly adds CMAKE_MAKE_PROGRAM to the CMake cache then CMake will use the specified value.

  • The Visual Studio Generators set this to the full path to MSBuild.exe (VS >= 10), devenv.com (VS 7,8,9), or VCExpress.exe (VS Express 8,9). (See also variables CMAKE_VS_MSBUILD_COMMAND and CMAKE_VS_DEVENV_COMMAND.

    These generators prefer to lookup the build tool at build time rather than to store CMAKE_MAKE_PROGRAM in the CMake cache ahead of time. This is because the tools are version-specific and can be located using the Windows Registry. It is also necessary because the proper build tool may depend on the project content (e.g. the Intel Fortran plugin to VS 10 and 11 requires devenv.com to build its .vfproj project files even though MSBuild.exe is normally preferred to support the CMAKE_GENERATOR_TOOLSET).

    For compatibility with versions of CMake prior to 3.0, if a user or project explicitly adds CMAKE_MAKE_PROGRAM to the CMake cache then CMake will use the specified value if possible.

  • The Green Hills MULTI generator sets this to the full path to gbuild.exe(Windows) or gbuild(Linux) based upon the toolset being used.

    Once the generator has initialized a particular value for this variable, changing the value has undefined behavior.

The CMAKE_MAKE_PROGRAM variable is set for use by project code. The value is also used by the cmake(1) --build and ctest(1) --build-and-test tools to launch the native build process.

New in version 3.2.

The number of matches with the last regular expression.

When a regular expression match is used, CMake fills in CMAKE_MATCH_<n> variables with the match contents. The CMAKE_MATCH_COUNT variable holds the number of match expressions when these are filled.

New in version 3.9.

Capture group <n> matched by the last regular expression, for groups 0 through 9. Group 0 is the entire match. Groups 1 through 9 are the subexpressions captured by () syntax.

When a regular expression match is used, CMake fills in CMAKE_MATCH_<n> variables with the match contents. The CMAKE_MATCH_COUNT variable holds the number of match expressions when these are filled.

The <min> version of CMake given to the most recent call to the cmake_minimum_required(VERSION) command in the current variable scope or any parent variable scope.

Second version number component of the CMAKE_VERSION variable.

New in version 3.11.

This variable is used to initialize the NETRC option for file(DOWNLOAD) and file(UPLOAD) commands and the module ExternalProject. See those commands for additional information.

The local option takes precedence over this variable.

New in version 3.11.

This variable is used to initialize the NETRC_FILE option for file(DOWNLOAD) and file(UPLOAD) commands and the module ExternalProject. See those commands for additional information.

The local option takes precedence over this variable.

Full path to the CMake file that included the current one.

While processing a CMake file loaded by include() or find_package() this variable contains the full path to the file including it. The top of the include stack is always the CMakeLists.txt for the current directory. See also CMAKE_CURRENT_LIST_FILE.

Third version number component of the CMAKE_VERSION variable.

New in version 3.9.

The description of the top level project.

This variable holds the description of the project as specified in the top level CMakeLists.txt file by a project() command. In the event that the top level CMakeLists.txt contains multiple project() calls, the most recently called one from that top level CMakeLists.txt will determine the value that CMAKE_PROJECT_DESCRIPTION contains. For example, consider the following top level CMakeLists.txt:

cmake_minimum_required(VERSION 3.0)
project(First DESCRIPTION "I am First")
project(Second DESCRIPTION "I am Second")
add_subdirectory(sub)
project(Third DESCRIPTION "I am Third")

And sub/CMakeLists.txt with the following contents:

project(SubProj DESCRIPTION "I am SubProj")
message("CMAKE_PROJECT_DESCRIPTION = ${CMAKE_PROJECT_DESCRIPTION}")

The most recently seen project() command from the top level CMakeLists.txt would be project(Second ...), so this will print:

CMAKE_PROJECT_DESCRIPTION = I am Second

To obtain the description from the most recent call to project() in the current directory scope or above, see the PROJECT_DESCRIPTION variable.

New in version 3.12.

The homepage URL of the top level project.

This variable holds the homepage URL of the project as specified in the top level CMakeLists.txt file by a project() command. In the event that the top level CMakeLists.txt contains multiple project() calls, the most recently called one from that top level CMakeLists.txt will determine the value that CMAKE_PROJECT_HOMEPAGE_URL contains. For example, consider the following top level CMakeLists.txt:

cmake_minimum_required(VERSION 3.0)
project(First HOMEPAGE_URL "http://first.example.com")
project(Second HOMEPAGE_URL "http://second.example.com")
add_subdirectory(sub)
project(Third HOMEPAGE_URL "http://third.example.com")

And sub/CMakeLists.txt with the following contents:

project(SubProj HOMEPAGE_URL "http://subproj.example.com")
message("CMAKE_PROJECT_HOMEPAGE_URL = ${CMAKE_PROJECT_HOMEPAGE_URL}")

The most recently seen project() command from the top level CMakeLists.txt would be project(Second ...), so this will print:

CMAKE_PROJECT_HOMEPAGE_URL = http://second.example.com

To obtain the homepage URL from the most recent call to project() in the current directory scope or above, see the PROJECT_HOMEPAGE_URL variable.

The name of the top level project.

This variable holds the name of the project as specified in the top level CMakeLists.txt file by a project() command. In the event that the top level CMakeLists.txt contains multiple project() calls, the most recently called one from that top level CMakeLists.txt will determine the name that CMAKE_PROJECT_NAME contains. For example, consider the following top level CMakeLists.txt:

cmake_minimum_required(VERSION 3.0)
project(First)
project(Second)
add_subdirectory(sub)
project(Third)

And sub/CMakeLists.txt with the following contents:

project(SubProj)
message("CMAKE_PROJECT_NAME = ${CMAKE_PROJECT_NAME}")

The most recently seen project() command from the top level CMakeLists.txt would be project(Second), so this will print:

CMAKE_PROJECT_NAME = Second

To obtain the name from the most recent call to project() in the current directory scope or above, see the PROJECT_NAME variable.

New in version 3.12.

The version of the top level project.

This variable holds the version of the project as specified in the top level CMakeLists.txt file by a project() command. In the event that the top level CMakeLists.txt contains multiple project() calls, the most recently called one from that top level CMakeLists.txt will determine the value that CMAKE_PROJECT_VERSION contains. For example, consider the following top level CMakeLists.txt:

cmake_minimum_required(VERSION 3.0)
project(First VERSION 1.2.3)
project(Second VERSION 3.4.5)
add_subdirectory(sub)
project(Third VERSION 6.7.8)

And sub/CMakeLists.txt with the following contents:

project(SubProj VERSION 1)
message("CMAKE_PROJECT_VERSION = ${CMAKE_PROJECT_VERSION}")

The most recently seen project() command from the top level CMakeLists.txt would be project(Second ...), so this will print:

CMAKE_PROJECT_VERSION = 3.4.5

To obtain the version from the most recent call to project() in the current directory scope or above, see the PROJECT_VERSION variable.

New in version 3.12.

The major version of the top level project.

This variable holds the major version of the project as specified in the top level CMakeLists.txt file by a project() command. Please see CMAKE_PROJECT_VERSION documentation for the behavior when multiple project() commands are used in the sources.

New in version 3.12.

The minor version of the top level project.

This variable holds the minor version of the project as specified in the top level CMakeLists.txt file by a project() command. Please see CMAKE_PROJECT_VERSION documentation for the behavior when multiple project() commands are used in the sources.

New in version 3.12.

The patch version of the top level project.

This variable holds the patch version of the project as specified in the top level CMakeLists.txt file by a project() command. Please see CMAKE_PROJECT_VERSION documentation for the behavior when multiple project() commands are used in the sources.

New in version 3.12.

The tweak version of the top level project.

This variable holds the tweak version of the project as specified in the top level CMakeLists.txt file by a project() command. Please see CMAKE_PROJECT_VERSION documentation for the behavior when multiple project() commands are used in the sources.

Name of randomizing tool for static libraries.

This specifies name of the program that randomizes libraries on UNIX, not used on Windows, but may be present.

Install directory for running cmake.

This is the install root for the running CMake and the Modules directory can be found here. This is commonly used in this format: ${CMAKE_ROOT}/Modules

New in version 3.13.

Specify whether to report a message for each make rule.

If set in the cache it is used to initialize the value of the RULE_MESSAGES property. Users may disable the option in their local build tree to disable granular messages and report only as each target completes in Makefile builds.

Full path to the cmake(1) -P script file currently being processed.

When run in cmake(1) -P script mode, CMake sets this variable to the full path of the script file. When run to configure a CMakeLists.txt file, this variable is not set.

The prefix for shared libraries that you link to.

The prefix to use for the name of a shared library, lib on UNIX.

CMAKE_SHARED_LIBRARY_PREFIX_<LANG> overrides this for language <LANG>.

The suffix for shared libraries that you link to.

The suffix to use for the end of a shared library filename, .dll on Windows.

CMAKE_SHARED_LIBRARY_SUFFIX_<LANG> overrides this for language <LANG>.

The prefix for loadable modules that you link to.

The prefix to use for the name of a loadable module on this platform.

CMAKE_SHARED_MODULE_PREFIX_<LANG> overrides this for language <LANG>.

The suffix for shared libraries that you link to.

The suffix to use for the end of a loadable module filename on this platform

CMAKE_SHARED_MODULE_SUFFIX_<LANG> overrides this for language <LANG>.

Size of a void pointer.

This is set to the size of a pointer on the target machine, and is determined by a try compile. If a 64-bit size is found, then the library search path is modified to look for 64-bit libraries first.

Whether to disable generation of installation rules.

If TRUE, CMake will neither generate installation rules nor will it generate cmake_install.cmake files. This variable is FALSE by default.

If true, do not add run time path information.

If this is set to TRUE, then the rpath information is not added to compiled executables. The default is to add rpath information if the platform supports it. This allows for easy running from the build tree. To omit RPATH in the install step, but not the build step, use CMAKE_SKIP_INSTALL_RPATH instead.

The path to the top level of the source tree.

This is the full path to the top level of the current CMake source tree. For an in-source build, this would be the same as CMAKE_BINARY_DIR.

When run in -P script mode, CMake sets the variables CMAKE_BINARY_DIR, CMAKE_SOURCE_DIR, CMAKE_CURRENT_BINARY_DIR and CMAKE_CURRENT_SOURCE_DIR to the current working directory.

The prefix for static libraries that you link to.

The prefix to use for the name of a static library, lib on UNIX.

CMAKE_STATIC_LIBRARY_PREFIX_<LANG> overrides this for language <LANG>.

The suffix for static libraries that you link to.

The suffix to use for the end of a static library filename, .lib on Windows.

CMAKE_STATIC_LIBRARY_SUFFIX_<LANG> overrides this for language <LANG>.

New in version 3.15.

Swift module output directory.

This variable is used to initialize the Swift_MODULE_DIRECTORY property on all the targets. See the target property for additional information.

New in version 3.15.1.

Number of threads for parallel compilation for Swift targets.

This variable controls the number of parallel jobs that the swift driver creates for building targets. If not specified, it will default to the number of logical CPUs on the host.

Path to toolchain file supplied to cmake(1).

This variable is specified on the command line when cross-compiling with CMake. It is the path to a file which is read early in the CMake run and which specifies locations for compilers and toolchain utilities, and other target platform and compiler related information.

Relative paths are allowed and are interpreted first as relative to the build directory, and if not found, relative to the source directory.

This is initialized by the CMAKE_TOOLCHAIN_FILE environment variable if it is set when a new build tree is first created.

Defined to 0 for compatibility with code written for older CMake versions that may have defined higher values.

NOTE:

In CMake versions 2.8.2 through 2.8.12, this variable holds the fourth version number component of the CMAKE_VERSION variable.

Enable verbose output from Makefile builds.

This variable is a cache entry initialized (to FALSE) by the project() command. Users may enable the option in their local build tree to get more verbose output from Makefile builds and show each command line as it is launched.

The CMake version string as three non-negative integer components separated by . and possibly followed by - and other information. The first two components represent the feature level and the third component represents either a bug-fix level or development date.

Release versions and release candidate versions of CMake use the format:

<major>.<minor>.<patch>[-rc<n>]

where the <patch> component is less than 20000000. Development versions of CMake use the format:

<major>.<minor>.<date>[-<id>]

where the <date> component is of format CCYYMMDD and <id> may contain arbitrary text. This represents development as of a particular date following the <major>.<minor> feature release.

Individual component values are also available in variables:

  • CMAKE_MAJOR_VERSION
  • CMAKE_MINOR_VERSION
  • CMAKE_PATCH_VERSION
  • CMAKE_TWEAK_VERSION

Use the if() command VERSION_LESS, VERSION_GREATER, VERSION_EQUAL, VERSION_LESS_EQUAL, or VERSION_GREATER_EQUAL operators to compare version string values against CMAKE_VERSION using a component-wise test. Version component values may be 10 or larger so do not attempt to compare version strings as floating-point numbers.

NOTE:

CMake versions 2.8.2 through 2.8.12 used three components for the feature level. Release versions represented the bug-fix level in a fourth component, i.e. <major>.<minor>.<patch>[.<tweak>][-rc<n>]. Development versions represented the development date in the fourth component, i.e. <major>.<minor>.<patch>.<date>[-<id>].

CMake versions prior to 2.8.2 used three components for the feature level and had no bug-fix component. Release versions used an even-valued second component, i.e. <major>.<even-minor>.<patch>[-rc<n>]. Development versions used an odd-valued second component with the development date as the third component, i.e. <major>.<odd-minor>.<date>.

The CMAKE_VERSION variable is defined by CMake 2.6.3 and higher. Earlier versions defined only the individual component variables.

The generators for Visual Studio 9 2008 and above set this variable to the devenv.com command installed with the corresponding Visual Studio version. Note that this variable may be empty on Visual Studio Express editions because they do not provide this tool.

This variable is not defined by other generators even if devenv.com is installed on the computer.

The CMAKE_VS_MSBUILD_COMMAND is also provided for Visual Studio 10 2010 and above. See also the CMAKE_MAKE_PROGRAM variable.

The generators for Visual Studio 10 2010 and above set this variable to the MSBuild.exe command installed with the corresponding Visual Studio version.

This variable is not defined by other generators even if MSBuild.exe is installed on the computer.

The CMAKE_VS_DEVENV_COMMAND is also provided for the non-Express editions of Visual Studio. See also the CMAKE_MAKE_PROGRAM variable.

New in version 3.1.

When using a Visual Studio generator with the CMAKE_SYSTEM_NAME variable set to Android, this variable contains the version number of the installed NVIDIA Nsight Tegra Visual Studio Edition.

New in version 3.1.

Visual Studio target platform name used by the current generator.

VS 8 and above allow project files to specify a target platform. CMake provides the name of the chosen platform in this variable. See the CMAKE_GENERATOR_PLATFORM variable for details.

See also the CMAKE_VS_PLATFORM_NAME_DEFAULT variable.

New in version 3.14.3.

Default for the Visual Studio target platform name for the current generator without considering the value of the CMAKE_GENERATOR_PLATFORM variable. For Visual Studio Generators for VS 2017 and below this is always Win32. For VS 2019 and above this is based on the host platform.

See also the CMAKE_VS_PLATFORM_NAME variable.

Visual Studio Platform Toolset name.

VS 10 and above use MSBuild under the hood and support multiple compiler toolchains. CMake may specify a toolset explicitly, such as v110 for VS 11 or Windows7.1SDK for 64-bit support in VS 10 Express. CMake provides the name of the chosen toolset in this variable.

See the CMAKE_GENERATOR_TOOLSET variable for details.

New in version 3.9.

NVIDIA CUDA Toolkit version whose Visual Studio toolset to use.

The Visual Studio Generators for VS 2010 and above support using a CUDA toolset provided by a CUDA Toolkit. The toolset version number may be specified by a field in CMAKE_GENERATOR_TOOLSET of the form cuda=8.0. Or it is automatically detected if a path to a standalone CUDA directory is specified in the form cuda=C:\path\to\cuda. If none is specified CMake will choose a default version. CMake provides the selected CUDA toolset version in this variable. The value may be empty if no CUDA Toolkit with Visual Studio integration is installed.

New in version 3.16.

Path to standalone NVIDIA CUDA Toolkit (eg. extracted from installer).

The Visual Studio Generators for VS 2010 and above support using a standalone (non-installed) NVIDIA CUDA toolkit. The path may be specified by a field in CMAKE_GENERATOR_TOOLSET of the form cuda=C:\path\to\cuda. The given directory must at least contain the nvcc compiler in path .\bin and must provide Visual Studio integration files in path .\extras\visual_studio_integration\ MSBuildExtensions\. One can create a standalone CUDA toolkit directory by either opening a installer with 7zip or copying the files that are extracted by the running installer. The value may be empty if no path to a standalone CUDA Toolkit was specified.

New in version 3.8.

Visual Studio preferred tool architecture.

The Visual Studio Generators for VS 2013 and above support using either the 32-bit or 64-bit host toolchains by specifying a host=x86 or host=x64 value in the CMAKE_GENERATOR_TOOLSET option. CMake provides the selected toolchain architecture preference in this variable (x86, x64, or empty).

New in version 3.12.

Visual Studio Platform Toolset version.

The Visual Studio Generators for VS 2017 and above allow to select minor versions of the same toolset. The toolset version number may be specified by a field in CMAKE_GENERATOR_TOOLSET of the form version=14.11. If none is specified CMake will choose a default toolset. The value may be empty if no minor version was selected and the default is used.

If the value is not empty, it is the version number that MSBuild uses in its Microsoft.VCToolsVersion.*.props file names.

New in version 3.19.7: VS 16.9's toolset may also be specified as 14.28.16.9 because VS 16.10 uses the file name Microsoft.VCToolsVersion.14.28.16.9.props.

New in version 3.19.7.

The version= field may be given a three-component toolset version such as 14.28.29910, and CMake will convert it to the name used by MSBuild Microsoft.VCToolsVersion.*.props files. This is useful to distinguish between VS 16.8's 14.28.29333 toolset and VS 16.9's 14.28.29910 toolset. It also matches vcvarsall's -vcvars_ver= behavior.

New in version 3.4.

Visual Studio Windows Target Platform Version.

When targeting Windows 10 and above Visual Studio 2015 and above support specification of a target Windows version to select a corresponding SDK. The CMAKE_SYSTEM_VERSION variable may be set to specify a version. Otherwise CMake computes a default version based on the Windows SDK versions available. The chosen Windows target version number is provided in CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION. If no Windows 10 SDK is available this value will be empty.

One may set a CMAKE_WINDOWS_KITS_10_DIR environment variable to an absolute path to tell CMake to look for Windows 10 SDKs in a custom location. The specified directory is expected to contain Include/10.0.* directories.

See also CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION_MAXIMUM.

New in version 3.19.

Override the Windows 10 SDK Maximum Version for VS 2015 and beyond.

The CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION_MAXIMUM variable may be set to a false value (e.g. OFF, FALSE, or 0) or the SDK version to use as the maximum (e.g. 10.0.14393.0). If unset, the default depends on which version of Visual Studio is targeted by the current generator.

This can be used in conjunction with CMAKE_SYSTEM_VERSION, which CMake uses to select CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION.

New in version 3.19.

Xcode build system selection.

The Xcode generator defines this variable to indicate which variant of the Xcode build system will be used. The value is the version of Xcode in which the corresponding build system first became mature enough for use by CMake. The possible values are:

1
The original Xcode build system. This is the default when using Xcode 11.x or below.
12
The Xcode "new build system" introduced by Xcode 10. It became mature enough for use by CMake in Xcode 12. This is the default when using Xcode 12.x or above.

The CMAKE_XCODE_BUILD_SYSTEM variable is informational and should not be modified by project code. See the Xcode Build System Selection documentation section to select the Xcode build system.

Xcode compiler selection.

Xcode supports selection of a compiler from one of the installed toolsets. CMake provides the name of the chosen toolset in this variable, if any is explicitly selected (e.g. via the cmake(1) -T option).

Top level binary directory for the named project.

A variable is created with the name used in the project() command, and is the binary directory for the project. This can be useful when add_subdirectory() is used to connect several projects.

New in version 3.12.

Value given to the DESCRIPTION option of the most recent call to the project() command with project name <PROJECT-NAME>, if any.

New in version 3.12.

Value given to the HOMEPAGE_URL option of the most recent call to the project() command with project name <PROJECT-NAME>, if any.

New in version 3.21.

A boolean variable indicating whether the named project was called in a top level CMakeLists.txt file.

To obtain the value from the most recent call to project() in the current directory scope or above, see the PROJECT_IS_TOP_LEVEL variable.

The variable value will be true in:

  • the top-level directory of the project
  • the top-level directory of an external project added by ExternalProject

The variable value will be false in:

  • a directory added by add_subdirectory()
  • a directory added by FetchContent

Top level source directory for the named project.

A variable is created with the name used in the project() command, and is the source directory for the project. This can be useful when add_subdirectory() is used to connect several projects.

Value given to the VERSION option of the most recent call to the project() command with project name <PROJECT-NAME>, if any.

See also the component-wise version variables <PROJECT-NAME>_VERSION_MAJOR, <PROJECT-NAME>_VERSION_MINOR, <PROJECT-NAME>_VERSION_PATCH, and <PROJECT-NAME>_VERSION_TWEAK.

First version number component of the <PROJECT-NAME>_VERSION variable as set by the project() command.

Second version number component of the <PROJECT-NAME>_VERSION variable as set by the project() command.

Third version number component of the <PROJECT-NAME>_VERSION variable as set by the project() command.

Fourth version number component of the <PROJECT-NAME>_VERSION variable as set by the project() command.

Full path to build directory for project.

This is the binary directory of the most recent project() command.

New in version 3.9.

Short project description given to the project command.

This is the description given to the most recently called project() command in the current directory scope or above. To obtain the description of the top level project, see the CMAKE_PROJECT_DESCRIPTION variable.

New in version 3.12.

The homepage URL of the project.

This is the homepage URL given to the most recently called project() command in the current directory scope or above. To obtain the homepage URL of the top level project, see the CMAKE_PROJECT_HOMEPAGE_URL variable.

New in version 3.21.

A boolean variable indicating whether the most recently called project() command in the current scope or above was in the top level CMakeLists.txt file.

Some modules should only be included as part of the top level CMakeLists.txt file to not cause unintended side effects in the build tree, and this variable can be used to conditionally execute such code. For example, consider the CTest module, which creates targets and options:

project(MyProject)
...
if(PROJECT_IS_TOP_LEVEL)
  include(CTest)
endif()

The variable value will be true in:

  • the top-level directory of the project
  • the top-level directory of an external project added by ExternalProject

The variable value will be false in:

  • a directory added by add_subdirectory()
  • a directory added by FetchContent

Name of the project given to the project command.

This is the name given to the most recently called project() command in the current directory scope or above. To obtain the name of the top level project, see the CMAKE_PROJECT_NAME variable.

This is the source directory of the last call to the project() command made in the current directory scope or one of its parents. Note, it is not affected by calls to project() made within a child directory scope (i.e. from within a call to add_subdirectory() from the current scope).

Value given to the VERSION option of the most recent call to the project() command, if any.

See also the component-wise version variables PROJECT_VERSION_MAJOR, PROJECT_VERSION_MINOR, PROJECT_VERSION_PATCH, and PROJECT_VERSION_TWEAK.

First version number component of the PROJECT_VERSION variable as set by the project() command.

Second version number component of the PROJECT_VERSION variable as set by the project() command.

Third version number component of the PROJECT_VERSION variable as set by the project() command.

Fourth version number component of the PROJECT_VERSION variable as set by the project() command.

Global flag to cause add_library() to create shared libraries if on.

If present and true, this will cause all libraries to be built shared unless the library was explicitly added as a static library. This variable is often added to projects as an option() so that each user of a project can decide if they want to build the project using shared or static libraries.

List of files which have been installed using an ABSOLUTE DESTINATION path.

This variable is defined by CMake-generated cmake_install.cmake scripts. It can be used (read-only) by programs or scripts that source those install scripts. This is used by some CPack generators (e.g. RPM).

Semicolon-separated list of directories specifying a search path for macOS application bundles used by the find_program(), and find_package() commands.

Deprecated since version 3.15.

Switch between strict and relaxed automoc mode.

By default, AUTOMOC behaves exactly as described in the documentation of the AUTOMOC target property. When set to TRUE, it accepts more input and tries to find the correct input file for moc even if it differs from the documented behavior. In this mode it e.g. also checks whether a header file is intended to be processed by moc when a "foo.moc" file has been included.

Relaxed mode has to be enabled for KDE4 compatibility.

Deprecated. See CMake Policy CMP0001 documentation.

Specifies the build type on single-configuration generators.

This statically specifies what build type (configuration) will be built in this build tree. Possible values are empty, Debug, Release, RelWithDebInfo, MinSizeRel, ... This variable is only meaningful to single-configuration generators (such as Makefile Generators and Ninja) i.e. those which choose a single configuration when CMake runs to generate a build tree as opposed to multi-configuration generators which offer selection of the build configuration within the generated build environment. There are many per-config properties and variables (usually following clean SOME_VAR_<CONFIG> order conventions), such as CMAKE_C_FLAGS_<CONFIG>, specified as uppercase: CMAKE_C_FLAGS_[DEBUG|RELEASE|RELWITHDEBINFO|MINSIZEREL|...]. For example, in a build tree configured to build type Debug, CMake will see to having CMAKE_C_FLAGS_DEBUG settings get added to the CMAKE_C_FLAGS settings. See also CMAKE_CONFIGURATION_TYPES.

Note that configuration names are case-insensitive. The value of this variable will be the same as it is specified when invoking CMake. For instance, if -DCMAKE_BUILD_TYPE=ReLeAsE is specified, then the value of CMAKE_BUILD_TYPE will be ReLeAsE.

New in version 3.19.

When cross compiling for windows with clang-cl, this variable can be an absolute path pointing to a clang virtual file system yaml file, which will enable clang-cl to resolve windows header names on a case sensitive file system.

New in version 3.11.

Change the compiler id in the generated CodeBlocks project files.

CodeBlocks uses its own compiler id string which differs from CMAKE_<LANG>_COMPILER_ID. If this variable is left empty, CMake tries to recognize the CodeBlocks compiler id automatically. Otherwise the specified string is used in the CodeBlocks project file. See the CodeBlocks documentation for valid compiler id strings.

Other IDEs like QtCreator that also use the CodeBlocks generator may ignore this setting.

New in version 3.10.

Change the way the CodeBlocks generator creates project files.

If this variable evaluates to ON the generator excludes from the project file any files that are located outside the project root.

New in version 3.7.

Change the way the CodeLite generator creates projectfiles.

If this variable evaluates to ON at the end of the top-level CMakeLists.txt file, the generator creates projectfiles based on targets rather than projects.

Enables color output when using the Makefile Generators.

When enabled, the generated Makefiles will produce colored output. Default is ON.

Specifies the available build types on multi-config generators.

This specifies what build types (configurations) will be available such as Debug, Release, RelWithDebInfo etc. This has reasonable defaults on most platforms, but can be extended to provide other build types.

See CMAKE_BUILD_TYPE for specifying the configuration with single-config generators.

New in version 3.6.

When set to TRUE in a directory, the build system produced by the Makefile Generators is set up to only consider dependencies on source files that appear either in the source or in the binary directories. Changes to source files outside of these directories will not cause rebuilds.

This should be used carefully in cases where some source files are picked up through external headers during the build.

Variable for disabling find_package() calls.

Every non-REQUIRED find_package() call in a project can be disabled by setting the variable CMAKE_DISABLE_FIND_PACKAGE_<PackageName> to TRUE. This can be used to build a project without an optional package, although that package is installed.

This switch should be used during the initial CMake run. Otherwise if the package has already been found in a previous CMake run, the variables which have been stored in the cache will still be there. In that case it is recommended to remove the cache variables for this package from the cache using the cache editor or cmake(1) -U

New in version 3.6.

This cache variable is used by the Eclipse project generator. See cmake-generators(7).

The Eclipse project generator generates so-called linked resources e.g. to the subproject root dirs in the source tree or to the source files of targets. This can be disabled by setting this variable to FALSE.

New in version 3.6.

This cache variable is used by the Eclipse project generator. See cmake-generators(7).

If this variable is set to TRUE, the Eclipse project generator will generate an Eclipse project in CMAKE_SOURCE_DIR . This project can then be used in Eclipse e.g. for the version control functionality. CMAKE_ECLIPSE_GENERATE_SOURCE_PROJECT defaults to FALSE; so nothing is written into the source directory.

New in version 3.6.

This cache variable is used by the Eclipse project generator. See cmake-generators(7).

This variable holds arguments which are used when Eclipse invokes the make tool. By default it is initialized to hold flags to enable parallel builds (using -j typically).

New in version 3.16.

This cache variable tells the Eclipse CDT4 project generator to set the resource encoding to the given value in generated project files. If no value is given, no encoding will be set.

New in version 3.6.

This cache variable is used by the Eclipse project generator. See cmake-generators(7).

When using the Eclipse project generator, CMake tries to find the Eclipse executable and detect the version of it. Depending on the version it finds, some features are enabled or disabled. If CMake doesn't find Eclipse, it assumes the oldest supported version, Eclipse Callisto (3.2).

Whether to issue errors for deprecated functionality.

If TRUE, use of deprecated functionality will issue fatal errors. If this variable is not set, CMake behaves as if it were set to FALSE.

Ask cmake_install.cmake script to error out as soon as a file with absolute INSTALL DESTINATION is encountered.

The fatal error is emitted before the installation of the offending file takes place. This variable is used by CMake-generated cmake_install.cmake scripts. If one sets this variable to ON while running the script, it may get fatal error messages from the script.

New in version 3.15.

If this variable is set to STDERR, STDOUT or NONE then commands in execute_process() calls will be printed to either stderr or stdout or not at all.

New in version 3.5.

Enable/Disable output of compile commands during generation.

If enabled, generates a compile_commands.json file containing the exact compiler calls for all translation units of the project in machine-readable form. The format of the JSON file looks like:

[
  {
    "directory": "/home/user/development/project",
    "command": "/usr/bin/c++ ... -c ../foo/foo.cc",
    "file": "../foo/foo.cc"
  },
  ...
  {
    "directory": "/home/user/development/project",
    "command": "/usr/bin/c++ ... -c ../foo/bar.cc",
    "file": "../foo/bar.cc"
  }
]

This is initialized by the CMAKE_EXPORT_COMPILE_COMMANDS environment variable, and initializes the EXPORT_COMPILE_COMMANDS target property for all targets.

NOTE:

This option is implemented only by Makefile Generators and the Ninja. It is ignored on other generators.

This option currently does not work well in combination with the UNITY_BUILD target property or the CMAKE_UNITY_BUILD variable.

New in version 3.15.

Enables the export(PACKAGE) command when CMP0090 is set to NEW.

The export(PACKAGE) command does nothing by default. In some cases it is desirable to write to the user package registry, so the CMAKE_EXPORT_PACKAGE_REGISTRY variable may be set to enable it.

If CMP0090 is not set to NEW this variable does nothing, and the CMAKE_EXPORT_NO_PACKAGE_REGISTRY variable controls the behavior instead.

See also Disabling the Package Registry.

New in version 3.1.

Disable the export(PACKAGE) command when CMP0090 is not set to NEW.

In some cases, for example for packaging and for system wide installations, it is not desirable to write the user package registry. If the CMAKE_EXPORT_NO_PACKAGE_REGISTRY variable is enabled, the export(PACKAGE) command will do nothing.

If CMP0090 is set to NEW this variable does nothing, and the CMAKE_EXPORT_PACKAGE_REGISTRY variable controls the behavior instead.

See also Disabling the Package Registry.

New in version 3.4.

This variable affects how find_* commands choose between macOS Application Bundles and unix-style package components.

On Darwin or systems supporting macOS Application Bundles, the CMAKE_FIND_APPBUNDLE variable can be set to empty or one of the following:

FIRST
Try to find application bundles before standard programs. This is the default on Darwin.
LAST
Try to find application bundles after standard programs.
ONLY
Only try to find application bundles.
NEVER
Never try to find application bundles.

New in version 3.4.

This variable affects how find_* commands choose between macOS Frameworks and unix-style package components.

On Darwin or systems supporting macOS Frameworks, the CMAKE_FIND_FRAMEWORK variable can be set to empty or one of the following:

FIRST
Try to find frameworks before standard libraries or headers. This is the default on Darwin.
LAST
Try to find frameworks after standard libraries or headers.
ONLY
Only try to find frameworks.
NEVER
Never try to find frameworks.

New in version 3.9.

Specify a <suffix> to tell the find_library() command to search in a lib<suffix> directory before each lib directory that would normally be searched.

This overrides the behavior of related global properties:

  • FIND_LIBRARY_USE_LIB32_PATHS
  • FIND_LIBRARY_USE_LIB64_PATHS
  • FIND_LIBRARY_USE_LIBX32_PATHS

Prefixes to prepend when looking for libraries.

This specifies what prefixes to add to library names when the find_library() command looks for libraries. On UNIX systems this is typically lib, meaning that when trying to find the foo library it will look for libfoo.

Suffixes to append when looking for libraries.

This specifies what suffixes to add to library names when the find_library() command looks for libraries. On Windows systems this is typically .lib and .dll, meaning that when trying to find the foo library it will look for foo.dll etc.

Exclude the values of the CMAKE_INSTALL_PREFIX and CMAKE_STAGING_PREFIX variables from CMAKE_SYSTEM_PREFIX_PATH. CMake adds these project-destination prefixes to CMAKE_SYSTEM_PREFIX_PATH by default in order to support building a series of dependent packages and installing them into a common prefix. Set CMAKE_FIND_NO_INSTALL_PREFIX to TRUE to suppress this behavior.

The CMAKE_SYSTEM_PREFIX_PATH is initialized on the first call to a project() or enable_language() command. Therefore one must set CMAKE_FIND_NO_INSTALL_PREFIX before this in order to take effect. A user may set the variable as a cache entry on the command line to achieve this.

Note that the prefix(es) may still be searched for other reasons, such as being the same prefix as the CMake installation, or for being a built-in system prefix.

New in version 3.1.

Deprecated since version 3.16: Use the CMAKE_FIND_USE_PACKAGE_REGISTRY variable instead.

By default this variable is not set. If neither CMAKE_FIND_USE_PACKAGE_REGISTRY nor CMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY is set, then find_package() will use the User Package Registry unless the NO_CMAKE_PACKAGE_REGISTRY option is provided.

CMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY is ignored if CMAKE_FIND_USE_PACKAGE_REGISTRY is set.

In some cases, for example to locate only system wide installations, it is not desirable to use the User Package Registry when searching for packages. If the CMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY variable is TRUE, all the find_package() commands will skip the User Package Registry as if they were called with the NO_CMAKE_PACKAGE_REGISTRY argument.

See also Disabling the Package Registry.

New in version 3.1.

Deprecated since version 3.16: Use the CMAKE_FIND_USE_SYSTEM_PACKAGE_REGISTRY variable instead.

By default this variable is not set. If neither CMAKE_FIND_USE_SYSTEM_PACKAGE_REGISTRY nor CMAKE_FIND_PACKAGE_NO_SYSTEM_PACKAGE_REGISTRY is set, then find_package() will use the System Package Registry unless the NO_CMAKE_SYSTEM_PACKAGE_REGISTRY option is provided.

CMAKE_FIND_PACKAGE_NO_SYSTEM_PACKAGE_REGISTRY is ignored if CMAKE_FIND_USE_SYSTEM_PACKAGE_REGISTRY is set.

In some cases, it is not desirable to use the System Package Registry when searching for packages. If the CMAKE_FIND_PACKAGE_NO_SYSTEM_PACKAGE_REGISTRY variable is TRUE, all the find_package() commands will skip the System Package Registry as if they were called with the NO_CMAKE_SYSTEM_PACKAGE_REGISTRY argument.

See also Disabling the Package Registry.

New in version 3.15.

Tell find_package() to try "Config" mode before "Module" mode if no mode was specified.

The command find_package() operates without an explicit mode when the reduced signature is used without the MODULE option. In this case, by default, CMake first tries Module mode by searching for a Find<pkg>.cmake module. If it fails, CMake then searches for the package using Config mode.

Set CMAKE_FIND_PACKAGE_PREFER_CONFIG to TRUE to tell find_package() to first search using Config mode before falling back to Module mode.

This variable may be useful when a developer has compiled a custom version of a common library and wishes to link it to a dependent project. If this variable is set to TRUE, it would prevent a dependent project's call to find_package() from selecting the default library located by the system's Find<pkg>.cmake module before finding the developer's custom built library.

Once this variable is set, it is the responsibility of the exported <pkg>Config.cmake files to provide the same result variables as the Find<pkg>.cmake modules so that dependent projects can use them interchangeably.

New in version 3.14.

Set to TRUE to tell find_package() calls to resolve symbolic links in the value of <PackageName>_DIR.

This is helpful in use cases where the package search path points at a proxy directory in which symlinks to the real package locations appear. This is not enabled by default because there are also common use cases in which the symlinks should be preserved.

Tell find_package() to warn if called without an explicit mode.

If find_package() is called without an explicit mode option (MODULE, CONFIG, or NO_MODULE) and no Find<pkg>.cmake module is in CMAKE_MODULE_PATH then CMake implicitly assumes that the caller intends to search for a package configuration file. If no package configuration file is found then the wording of the failure message must account for both the case that the package is really missing and the case that the project has a bug and failed to provide the intended Find module. If instead the caller specifies an explicit mode option then the failure message can be more specific.

Set CMAKE_FIND_PACKAGE_WARN_NO_MODULE to TRUE to tell find_package() to warn when it implicitly assumes Config mode. This helps developers enforce use of an explicit mode in all calls to find_package() within a project.

This variable has no effect if CMAKE_FIND_PACKAGE_PREFER_CONFIG is set to TRUE.

Semicolon-separated list of root paths to search on the filesystem.

This variable is most useful when cross-compiling. CMake uses the paths in this list as alternative roots to find filesystem items with find_package(), find_library() etc.

This variable controls whether the CMAKE_FIND_ROOT_PATH and CMAKE_SYSROOT are used by find_file() and find_path().

If set to ONLY, then only the roots in CMAKE_FIND_ROOT_PATH will be searched. If set to NEVER, then the roots in CMAKE_FIND_ROOT_PATH will be ignored and only the host system root will be used. If set to BOTH, then the host system paths and the paths in CMAKE_FIND_ROOT_PATH will be searched.

This variable controls whether the CMAKE_FIND_ROOT_PATH and CMAKE_SYSROOT are used by find_library().

If set to ONLY, then only the roots in CMAKE_FIND_ROOT_PATH will be searched. If set to NEVER, then the roots in CMAKE_FIND_ROOT_PATH will be ignored and only the host system root will be used. If set to BOTH, then the host system paths and the paths in CMAKE_FIND_ROOT_PATH will be searched.

This variable controls whether the CMAKE_FIND_ROOT_PATH and CMAKE_SYSROOT are used by find_package().

If set to ONLY, then only the roots in CMAKE_FIND_ROOT_PATH will be searched. If set to NEVER, then the roots in CMAKE_FIND_ROOT_PATH will be ignored and only the host system root will be used. If set to BOTH, then the host system paths and the paths in CMAKE_FIND_ROOT_PATH will be searched.

This variable controls whether the CMAKE_FIND_ROOT_PATH and CMAKE_SYSROOT are used by find_program().

If set to ONLY, then only the roots in CMAKE_FIND_ROOT_PATH will be searched. If set to NEVER, then the roots in CMAKE_FIND_ROOT_PATH will be ignored and only the host system root will be used. If set to BOTH, then the host system paths and the paths in CMAKE_FIND_ROOT_PATH will be searched.

New in version 3.16.

Controls the default behavior of the following commands for whether or not to search paths provided by cmake-specific environment variables:

  • find_program()
  • find_library()
  • find_file()
  • find_path()
  • find_package()

This is useful in cross-compiling environments.

By default this variable is not set, which is equivalent to it having a value of TRUE. Explicit options given to the above commands take precedence over this variable.

See also the CMAKE_FIND_USE_CMAKE_PATH, CMAKE_FIND_USE_CMAKE_SYSTEM_PATH, CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH, CMAKE_FIND_USE_SYSTEM_PACKAGE_REGISTRY, CMAKE_FIND_USE_PACKAGE_REGISTRY, and CMAKE_FIND_USE_PACKAGE_ROOT_PATH variables.

New in version 3.16.

Controls the default behavior of the following commands for whether or not to search paths provided by cmake-specific cache variables:

  • find_program()
  • find_library()
  • find_file()
  • find_path()
  • find_package()

This is useful in cross-compiling environments.

By default this variable is not set, which is equivalent to it having a value of TRUE. Explicit options given to the above commands take precedence over this variable.

See also the CMAKE_FIND_USE_CMAKE_ENVIRONMENT_PATH, CMAKE_FIND_USE_CMAKE_SYSTEM_PATH, CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH, CMAKE_FIND_USE_SYSTEM_PACKAGE_REGISTRY, CMAKE_FIND_USE_PACKAGE_REGISTRY, and CMAKE_FIND_USE_PACKAGE_ROOT_PATH variables.

New in version 3.16.

Controls the default behavior of the following commands for whether or not to search paths provided by platform-specific cmake variables:

  • find_program()
  • find_library()
  • find_file()
  • find_path()
  • find_package()

This is useful in cross-compiling environments.

By default this variable is not set, which is equivalent to it having a value of TRUE. Explicit options given to the above commands take precedence over this variable.

See also the CMAKE_FIND_USE_CMAKE_PATH, CMAKE_FIND_USE_CMAKE_ENVIRONMENT_PATH, CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH, CMAKE_FIND_USE_SYSTEM_PACKAGE_REGISTRY, CMAKE_FIND_USE_PACKAGE_REGISTRY, and CMAKE_FIND_USE_PACKAGE_ROOT_PATH variables.

New in version 3.16.

Controls the default behavior of the find_package() command for whether or not to search paths provided by the User Package Registry.

By default this variable is not set and the behavior will fall back to that determined by the deprecated CMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY variable. If that is also not set, then find_package() will use the User Package Registry unless the NO_CMAKE_PACKAGE_REGISTRY option is provided.

This variable takes precedence over CMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY when both are set.

In some cases, for example to locate only system wide installations, it is not desirable to use the User Package Registry when searching for packages. If the CMAKE_FIND_USE_PACKAGE_REGISTRY variable is FALSE, all the find_package() commands will skip the User Package Registry as if they were called with the NO_CMAKE_PACKAGE_REGISTRY argument.

See also Disabling the Package Registry and the CMAKE_FIND_USE_CMAKE_PATH, CMAKE_FIND_USE_CMAKE_ENVIRONMENT_PATH, CMAKE_FIND_USE_CMAKE_SYSTEM_PATH, CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH, CMAKE_FIND_USE_SYSTEM_PACKAGE_REGISTRY, and CMAKE_FIND_USE_PACKAGE_ROOT_PATH variables.

New in version 3.16.

Controls the default behavior of the following commands for whether or not to search paths provided by <PackageName>_ROOT variables:

  • find_program()
  • find_library()
  • find_file()
  • find_path()
  • find_package()

By default this variable is not set, which is equivalent to it having a value of TRUE. Explicit options given to the above commands take precedence over this variable.

See also the CMAKE_FIND_USE_CMAKE_PATH, CMAKE_FIND_USE_CMAKE_ENVIRONMENT_PATH, CMAKE_FIND_USE_CMAKE_SYSTEM_PATH, CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH, CMAKE_FIND_USE_SYSTEM_PACKAGE_REGISTRY, and CMAKE_FIND_USE_PACKAGE_REGISTRY variables.

New in version 3.16.

Controls the default behavior of the following commands for whether or not to search paths provided by standard system environment variables:

  • find_program()
  • find_library()
  • find_file()
  • find_path()
  • find_package()

This is useful in cross-compiling environments.

By default this variable is not set, which is equivalent to it having a value of TRUE. Explicit options given to the above commands take precedence over this variable.

See also the CMAKE_FIND_USE_CMAKE_PATH, CMAKE_FIND_USE_CMAKE_ENVIRONMENT_PATH, CMAKE_FIND_USE_CMAKE_SYSTEM_PATH, CMAKE_FIND_USE_PACKAGE_REGISTRY, CMAKE_FIND_USE_PACKAGE_ROOT_PATH, and CMAKE_FIND_USE_SYSTEM_PACKAGE_REGISTRY variables.

New in version 3.16.

Controls searching the System Package Registry by the find_package() command.

By default this variable is not set and the behavior will fall back to that determined by the deprecated CMAKE_FIND_PACKAGE_NO_SYSTEM_PACKAGE_REGISTRY variable. If that is also not set, then find_package() will use the System Package Registry unless the NO_CMAKE_SYSTEM_PACKAGE_REGISTRY option is provided.

This variable takes precedence over CMAKE_FIND_PACKAGE_NO_SYSTEM_PACKAGE_REGISTRY when both are set.

In some cases, for example to locate only user specific installations, it is not desirable to use the System Package Registry when searching for packages. If the CMAKE_FIND_USE_SYSTEM_PACKAGE_REGISTRY variable is FALSE, all the find_package() commands will skip the System Package Registry as if they were called with the NO_CMAKE_SYSTEM_PACKAGE_REGISTRY argument.

See also Disabling the Package Registry.

See also the CMAKE_FIND_USE_CMAKE_PATH, CMAKE_FIND_USE_CMAKE_ENVIRONMENT_PATH, CMAKE_FIND_USE_CMAKE_SYSTEM_PATH, CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH, CMAKE_FIND_USE_PACKAGE_REGISTRY, and CMAKE_FIND_USE_PACKAGE_ROOT_PATH variables.

Semicolon-separated list of directories specifying a search path for macOS frameworks used by the find_library(), find_package(), find_path(), and find_file() commands.

Semicolon-separated list of directories to be ignored by the find_program(), find_library(), find_file(), and find_path() commands. This is useful in cross-compiling environments where some system directories contain incompatible but possibly linkable libraries. For example, on cross-compiled cluster environments, this allows a user to ignore directories containing libraries meant for the front-end machine.

By default this is empty; it is intended to be set by the project. Note that CMAKE_IGNORE_PATH takes a list of directory names, not a list of prefixes. To ignore paths under prefixes (bin, include, lib, etc.), specify them explicitly.

See also the CMAKE_PREFIX_PATH, CMAKE_LIBRARY_PATH, CMAKE_INCLUDE_PATH, and CMAKE_PROGRAM_PATH variables.

Whether to append or prepend directories by default in include_directories().

This variable affects the default behavior of the include_directories() command. Setting this variable to ON is equivalent to using the BEFORE option in all uses of that command.

Whether to force prepending of project include directories.

This variable affects the order of include directories generated in compiler command lines. If set to ON, it causes the CMAKE_SOURCE_DIR and the CMAKE_BINARY_DIR to appear first.

Semicolon-separated list of directories specifying a search path for the find_file() and find_path() commands. By default it is empty, it is intended to be set by the project. See also CMAKE_SYSTEM_INCLUDE_PATH and CMAKE_PREFIX_PATH.

Default component used in install() commands.

If an install() command is used without the COMPONENT argument, these files will be grouped into a default component. The name of this default install component will be taken from this variable. It defaults to Unspecified.

New in version 3.11.

Default permissions for directories created implicitly during installation of files by install() and file(INSTALL).

If make install is invoked and directories are implicitly created they get permissions set by CMAKE_INSTALL_DEFAULT_DIRECTORY_PERMISSIONS variable or platform specific default permissions if the variable is not set.

Implicitly created directories are created if they are not explicitly installed by install() command but are needed to install a file on a certain path. Example of such locations are directories created due to the setting of CMAKE_INSTALL_PREFIX.

Expected content of the CMAKE_INSTALL_DEFAULT_DIRECTORY_PERMISSIONS variable is a list of permissions that can be used by install() command PERMISSIONS section.

Example usage:

set(CMAKE_INSTALL_DEFAULT_DIRECTORY_PERMISSIONS
     OWNER_READ
     OWNER_WRITE
     OWNER_EXECUTE
     GROUP_READ
   )

New in version 3.1.

Specify verbosity of installation script code generated by the install() command (using the file(INSTALL) command). For paths that are newly installed or updated, installation may print lines like:

-- Installing: /some/destination/path

For paths that are already up to date, installation may print lines like:

-- Up-to-date: /some/destination/path

The CMAKE_INSTALL_MESSAGE variable may be set to control which messages are printed:

ALWAYS
Print both Installing and Up-to-date messages.
LAZY
Print Installing but not Up-to-date messages.
NEVER
Print neither Installing nor Up-to-date messages.

Other values have undefined behavior and may not be diagnosed.

If this variable is not set, the default behavior is ALWAYS.

Install directory used by install().

If make install is invoked or INSTALL is built, this directory is prepended onto all install directories. This variable defaults to /usr/local on UNIX and c:/Program Files/${PROJECT_NAME} on Windows. See CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT for how a project might choose its own default.

On UNIX one can use the DESTDIR mechanism in order to relocate the whole installation. See DESTDIR for more information.

The installation prefix is also added to CMAKE_SYSTEM_PREFIX_PATH so that find_package(), find_program(), find_library(), find_path(), and find_file() will search the prefix for other software.

NOTE:

Use the GNUInstallDirs module to provide GNU-style options for the layout of directories within the installation.

New in version 3.7.1.

CMake sets this variable to a TRUE value when the CMAKE_INSTALL_PREFIX has just been initialized to its default value, typically on the first run of CMake within a new build tree. This can be used by project code to change the default without overriding a user-provided value:

if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
  set(CMAKE_INSTALL_PREFIX "/my/default" CACHE PATH "..." FORCE)
endif()

Semicolon-separated list of directories specifying a search path for the find_library() command. By default it is empty, it is intended to be set by the project. See also CMAKE_SYSTEM_LIBRARY_PATH and CMAKE_PREFIX_PATH.
New in version 3.13.

Whether to append or prepend directories by default in link_directories().

This variable affects the default behavior of the link_directories() command. Setting this variable to ON is equivalent to using the BEFORE option in all uses of that command.

Use the MFC library for an executable or dll.

Enables the use of the Microsoft Foundation Classes (MFC). It should be set to 1 for the static MFC library, and 2 for the shared MFC library. This is used in Visual Studio project files.

Usage example:

add_definitions(-D_AFXDLL)
set(CMAKE_MFC_FLAG 2)
add_executable(CMakeSetup WIN32 ${SRCS})

Contents of CMAKE_MFC_FLAG may use generator expressions.

New in version 3.14.

Maximum recursion depth for CMake scripts. It is intended to be set on the command line with -DCMAKE_MAXIMUM_RECURSION_DEPTH=<x>, or within CMakeLists.txt by projects that require a large recursion depth. Projects that set this variable should provide the user with a way to override it. For example:

# About to perform deeply recursive actions
if(NOT CMAKE_MAXIMUM_RECURSION_DEPTH)
  set(CMAKE_MAXIMUM_RECURSION_DEPTH 2000)
endif()

If it is not set, or is set to a non-integer value, a sensible default limit is used. If the recursion limit is reached, the script terminates immediately with a fatal error.

Calling any of the following commands increases the recursion depth:

  • include()
  • find_package()
  • add_subdirectory()
  • try_compile()
  • ctest_read_custom_files()
  • ctest_run_script() (unless NEW_PROCESS is specified)
  • User-defined function()'s and macro()'s (note that function() and macro() themselves don't increase recursion depth)
  • Reading or writing variables that are being watched by a variable_watch()

New in version 3.17.

When enabled by the cmake --log-context command line option or the CMAKE_MESSAGE_CONTEXT_SHOW variable, the message() command converts the CMAKE_MESSAGE_CONTEXT list into a dot-separated string surrounded by square brackets and prepends it to each line for messages of log levels NOTICE and below.

For logging contexts to work effectively, projects should generally APPEND and POP_BACK an item to the current value of CMAKE_MESSAGE_CONTEXT rather than replace it. Projects should not assume the message context at the top of the source tree is empty, as there are scenarios where the context might have already been set (e.g. hierarchical projects).

WARNING:

Valid context names are restricted to anything that could be used as a CMake variable name. All names that begin with an underscore or the string cmake_ are also reserved for use by CMake and should not be used by projects.

Example:

function(bar)
  list(APPEND CMAKE_MESSAGE_CONTEXT "bar")
  message(VERBOSE "bar VERBOSE message")
endfunction()
function(baz)
  list(APPEND CMAKE_MESSAGE_CONTEXT "baz")
  message(DEBUG "baz DEBUG message")
endfunction()
function(foo)
  list(APPEND CMAKE_MESSAGE_CONTEXT "foo")
  bar()
  message(TRACE "foo TRACE message")
  baz()
endfunction()
list(APPEND CMAKE_MESSAGE_CONTEXT "top")
message(VERBOSE "Before `foo`")
foo()
message(VERBOSE "After `foo`")
list(POP_BACK CMAKE_MESSAGE_CONTEXT)

Which results in the following output:

-- [top] Before `foo`
-- [top.foo.bar] bar VERBOSE message
-- [top.foo] foo TRACE message
-- [top.foo.baz] baz DEBUG message
-- [top] After `foo`

New in version 3.17.

Setting this variable to true enables showing a context with each line logged by the message() command (see CMAKE_MESSAGE_CONTEXT for how the context itself is specified).

This variable is an alternative to providing the --log-context option on the cmake command line. Whereas the command line option will apply only to that one CMake run, setting CMAKE_MESSAGE_CONTEXT_SHOW to true as a cache variable will ensure that subsequent CMake runs will continue to show the message context.

Projects should not set CMAKE_MESSAGE_CONTEXT_SHOW. It is intended for users so that they may control whether or not to include context with messages.

New in version 3.16.

The message() command joins the strings from this list and for log levels of NOTICE and below, it prepends the resultant string to each line of the message.

Example:

list(APPEND listVar one two three)
message(VERBOSE [[Collected items in the "listVar":]])
list(APPEND CMAKE_MESSAGE_INDENT "  ")
foreach(item IN LISTS listVar)
  message(VERBOSE ${item})
endforeach()
list(POP_BACK CMAKE_MESSAGE_INDENT)
message(VERBOSE "No more indent")

Which results in the following output:

-- Collected items in the "listVar":
--   one
--   two
--   three
-- No more indent

New in version 3.17.

When set, this variable specifies the logging level used by the message() command. Valid values are the same as those for the --log-level command line option of the cmake(1) program. If this variable is set and the --log-level command line option is given, the command line option takes precedence.

The main advantage to using this variable is to make a log level persist between CMake runs. Setting it as a cache variable will ensure that subsequent CMake runs will continue to use the chosen log level.

Projects should not set this variable, it is intended for users so that they may control the log level according to their own needs.

Semicolon-separated list of directories specifying a search path for CMake modules to be loaded by the include() or find_package() commands before checking the default modules that come with CMake. By default it is empty, it is intended to be set by the project.

Default for CMake Policy CMP<NNNN> when it is otherwise left unset.

Commands cmake_minimum_required(VERSION) and cmake_policy(VERSION) by default leave policies introduced after the given version unset. Set CMAKE_POLICY_DEFAULT_CMP<NNNN> to OLD or NEW to specify the default for policy CMP<NNNN>, where <NNNN> is the policy number.

This variable should not be set by a project in CMake code; use cmake_policy(SET) instead. Users running CMake may set this variable in the cache (e.g. -DCMAKE_POLICY_DEFAULT_CMP<NNNN>=<OLD|NEW>) to set a policy not otherwise set by the project. Set to OLD to quiet a policy warning while using old behavior or to NEW to try building the project with new behavior.

Explicitly enable or disable the warning when CMake Policy CMP<NNNN> is not set. This is meaningful only for the few policies that do not warn by default:
  • CMAKE_POLICY_WARNING_CMP0025 controls the warning for policy CMP0025.
  • CMAKE_POLICY_WARNING_CMP0047 controls the warning for policy CMP0047.
  • CMAKE_POLICY_WARNING_CMP0056 controls the warning for policy CMP0056.
  • CMAKE_POLICY_WARNING_CMP0060 controls the warning for policy CMP0060.
  • CMAKE_POLICY_WARNING_CMP0065 controls the warning for policy CMP0065.
  • CMAKE_POLICY_WARNING_CMP0066 controls the warning for policy CMP0066.
  • CMAKE_POLICY_WARNING_CMP0067 controls the warning for policy CMP0067.
  • CMAKE_POLICY_WARNING_CMP0082 controls the warning for policy CMP0082.
  • CMAKE_POLICY_WARNING_CMP0089 controls the warning for policy CMP0089.
  • CMAKE_POLICY_WARNING_CMP0102 controls the warning for policy CMP0102.
  • CMAKE_POLICY_WARNING_CMP0112 controls the warning for policy CMP0112.
  • CMAKE_POLICY_WARNING_CMP0116 controls the warning for policy CMP0116.
  • CMAKE_POLICY_WARNING_CMP0126 controls the warning for policy CMP0126.

This variable should not be set by a project in CMake code. Project developers running CMake may set this variable in their cache to enable the warning (e.g. -DCMAKE_POLICY_WARNING_CMP<NNNN>=ON). Alternatively, running cmake(1) with the --debug-output, --trace, or --trace-expand option will also enable the warning.

Semicolon-separated list of directories specifying installation prefixes to be searched by the find_package(), find_program(), find_library(), find_file(), and find_path() commands. Each command will add appropriate subdirectories (like bin, lib, or include) as specified in its own documentation.

By default this is empty. It is intended to be set by the project.

See also CMAKE_SYSTEM_PREFIX_PATH, CMAKE_INCLUDE_PATH, CMAKE_LIBRARY_PATH, CMAKE_PROGRAM_PATH, and CMAKE_IGNORE_PATH.

Semicolon-separated list of directories specifying a search path for the find_program() command. By default it is empty, it is intended to be set by the project. See also CMAKE_SYSTEM_PROGRAM_PATH and CMAKE_PREFIX_PATH.

New in version 3.15.

A CMake language file or module to be included as the last step of all project() command calls. This is intended for injecting custom code into project builds without modifying their source.

See also the CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE, CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE_BEFORE and CMAKE_PROJECT_INCLUDE_BEFORE variables.

New in version 3.15.

A CMake language file or module to be included as the first step of all project() command calls. This is intended for injecting custom code into project builds without modifying their source.

See also the CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE, CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE_BEFORE and CMAKE_PROJECT_INCLUDE variables.

A CMake language file or module to be included as the last step of any project() command calls that specify <PROJECT-NAME> as the project name. This is intended for injecting custom code into project builds without modifying their source.

See also the CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE_BEFORE, CMAKE_PROJECT_INCLUDE and CMAKE_PROJECT_INCLUDE_BEFORE variables.

New in version 3.17.

A CMake language file or module to be included as the first step of any project() command calls that specify <PROJECT-NAME> as the project name. This is intended for injecting custom code into project builds without modifying their source.

See also the CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE, CMAKE_PROJECT_INCLUDE and CMAKE_PROJECT_INCLUDE_BEFORE variables.

Don't make the install target depend on the all target.

By default, the install target depends on the all target. This has the effect, that when make install is invoked or INSTALL is built, first the all target is built, then the installation starts. If CMAKE_SKIP_INSTALL_ALL_DEPENDENCY is set to TRUE, this dependency is not created, so the installation process will start immediately, independent from whether the project has been completely built or not.

This variable may be set to a path to install to when cross-compiling. This can be useful if the path in CMAKE_SYSROOT is read-only, or otherwise should remain pristine.

The CMAKE_STAGING_PREFIX location is also used as a search prefix by the find_* commands. This can be controlled by setting the CMAKE_FIND_NO_INSTALL_PREFIX variable.

If any RPATH/RUNPATH entries passed to the linker contain the CMAKE_STAGING_PREFIX, the matching path fragments are replaced with the CMAKE_INSTALL_PREFIX.

New in version 3.8.

This variable contains a list of env vars as a list of tokens with the syntax var=value.

Example:

set(CMAKE_SUBLIME_TEXT_2_ENV_SETTINGS
   "FOO=FOO1\;FOO2\;FOON"
   "BAR=BAR1\;BAR2\;BARN"
   "BAZ=BAZ1\;BAZ2\;BAZN"
   "FOOBAR=FOOBAR1\;FOOBAR2\;FOOBARN"
   "VALID="
   )

In case of malformed variables CMake will fail:

set(CMAKE_SUBLIME_TEXT_2_ENV_SETTINGS
    "THIS_IS_NOT_VALID"
    )

New in version 3.8.

If this variable evaluates to ON at the end of the top-level CMakeLists.txt file, the Sublime Text 2 extra generator excludes the build tree from the .sublime-project if it is inside the source tree.

New in version 3.12.

If CMAKE_SUPPRESS_REGENERATION is OFF, which is default, then CMake adds a special target on which all other targets depend that checks the build system and optionally re-runs CMake to regenerate the build system when the target specification source changes.

If this variable evaluates to ON at the end of the top-level CMakeLists.txt file, CMake will not add the regeneration target to the build system or perform any build system checks.

Path to pass to the compiler in the --sysroot flag.

The CMAKE_SYSROOT content is passed to the compiler in the --sysroot flag, if supported. The path is also stripped from the RPATH/RUNPATH if necessary on installation. The CMAKE_SYSROOT is also used to prefix paths searched by the find_* commands.

This variable may only be set in a toolchain file specified by the CMAKE_TOOLCHAIN_FILE variable.

See also the CMAKE_SYSROOT_COMPILE and CMAKE_SYSROOT_LINK variables.

New in version 3.9.

Path to pass to the compiler in the --sysroot flag when compiling source files. This is the same as CMAKE_SYSROOT but is used only for compiling sources and not linking.

This variable may only be set in a toolchain file specified by the CMAKE_TOOLCHAIN_FILE variable.

New in version 3.9.

Path to pass to the compiler in the --sysroot flag when linking. This is the same as CMAKE_SYSROOT but is used only for linking and not compiling sources.

This variable may only be set in a toolchain file specified by the CMAKE_TOOLCHAIN_FILE variable.

New in version 3.4.

Search path for macOS application bundles used by the find_program(), and find_package() commands. By default it contains the standard directories for the current system. It is not intended to be modified by the project, use CMAKE_APPBUNDLE_PATH for this.

New in version 3.4.

Search path for macOS frameworks used by the find_library(), find_package(), find_path(), and find_file() commands. By default it contains the standard directories for the current system. It is not intended to be modified by the project, use CMAKE_FRAMEWORK_PATH for this.

Semicolon-separated list of directories to be ignored by the find_program(), find_library(), find_file(), and find_path() commands. This is useful in cross-compiling environments where some system directories contain incompatible but possibly linkable libraries. For example, on cross-compiled cluster environments, this allows a user to ignore directories containing libraries meant for the front-end machine.

By default this contains a list of directories containing incompatible binaries for the host system. See the CMAKE_IGNORE_PATH variable that is intended to be set by the project.

See also the CMAKE_SYSTEM_PREFIX_PATH, CMAKE_SYSTEM_LIBRARY_PATH, CMAKE_SYSTEM_INCLUDE_PATH, and CMAKE_SYSTEM_PROGRAM_PATH variables.

Semicolon-separated list of directories specifying a search path for the find_file() and find_path() commands. By default this contains the standard directories for the current system. It is not intended to be modified by the project; use CMAKE_INCLUDE_PATH for this. See also CMAKE_SYSTEM_PREFIX_PATH.

Semicolon-separated list of directories specifying a search path for the find_library() command. By default this contains the standard directories for the current system. It is not intended to be modified by the project; use CMAKE_LIBRARY_PATH for this. See also CMAKE_SYSTEM_PREFIX_PATH.

Semicolon-separated list of directories specifying installation prefixes to be searched by the find_package(), find_program(), find_library(), find_file(), and find_path() commands. Each command will add appropriate subdirectories (like bin, lib, or include) as specified in its own documentation.

By default this contains the system directories for the current system, the CMAKE_INSTALL_PREFIX, and the CMAKE_STAGING_PREFIX. The installation and staging prefixes may be excluded by setting the CMAKE_FIND_NO_INSTALL_PREFIX variable.

The system directories that are contained in CMAKE_SYSTEM_PREFIX_PATH are locations that typically include installed software. An example being /usr/local for UNIX based platforms. In addition to standard platform locations, CMake will also add values to CMAKE_SYSTEM_PREFIX_PATH based on environment variables. The environment variables and search locations that CMake uses may evolve over time, as platforms and their conventions also evolve. The following provides an indicative list of environment variables and locations that CMake searches, but they are subject to change:

CrayLinuxEnvironment:
  • ENV{SYSROOT_DIR}/
  • ENV{SYSROOT_DIR}/usr
  • ENV{SYSROOT_DIR}/usr/local
Darwin:
ENV{SDKROOT}/usr When CMAKE_OSX_SYSROOT is not explicitly specified.
OpenBSD:
ENV{LOCALBASE}
Unix:
ENV{CONDA_PREFIX} when using a conda compiler
Windows:
  • ENV{ProgramW6432}
  • ENV{ProgramFiles}
  • ENV{ProgramFiles(x86)}
  • ENV{SystemDrive}/Program Files
  • ENV{SystemDrive}/Program Files (x86)

CMAKE_SYSTEM_PREFIX_PATH is not intended to be modified by the project; use CMAKE_PREFIX_PATH for this.

See also CMAKE_SYSTEM_INCLUDE_PATH, CMAKE_SYSTEM_LIBRARY_PATH, CMAKE_SYSTEM_PROGRAM_PATH, and CMAKE_SYSTEM_IGNORE_PATH.

Semicolon-separated list of directories specifying a search path for the find_program() command. By default this contains the standard directories for the current system. It is not intended to be modified by the project; use CMAKE_PROGRAM_PATH for this. See also CMAKE_SYSTEM_PREFIX_PATH.

Specify the default value for the file(DOWNLOAD) and file(UPLOAD) commands' TLS_VERIFY options. If not set, the default is off.

This setting is also used by the ExternalProject module for internal calls to file(DOWNLOAD).

TLS verification can help provide confidence that one is connecting to the desired server. When downloading known content, one should also use file hashes to verify it.

set(CMAKE_TLS_VERIFY TRUE)

Specify a CMake file that overrides platform information.

CMake loads the specified file while enabling support for each language from either the project() or enable_language() commands. It is loaded after CMake's builtin compiler and platform information modules have been loaded but before the information is used. The file may set platform information variables to override CMake's defaults.

This feature is intended for use only in overriding information variables that must be set before CMake builds its first test project to check that the compiler for a language works. It should not be used to load a file in cases that a normal include() will work. Use it only as a last resort for behavior that cannot be achieved any other way. For example, one may set the CMAKE_C_FLAGS_INIT variable to change the default value used to initialize the CMAKE_C_FLAGS variable before it is cached. The override file should NOT be used to set anything that could be set after languages are enabled, such as variables like CMAKE_RUNTIME_OUTPUT_DIRECTORY that affect the placement of binaries. Information set in the file will be used for try_compile() and try_run() builds too.

Whether to issue warnings for deprecated functionality.

If not FALSE, use of deprecated functionality will issue warnings. If this variable is not set, CMake behaves as if it were set to TRUE.

When running cmake(1), this option can be enabled with the -Wdeprecated option, or disabled with the -Wno-deprecated option.

Ask cmake_install.cmake script to warn each time a file with absolute INSTALL DESTINATION is encountered.

This variable is used by CMake-generated cmake_install.cmake scripts. If one sets this variable to ON while running the script, it may get warning messages from the script.

New in version 3.9.

If enabled, the Xcode generator will generate schema files. These are useful to invoke analyze, archive, build-for-testing and test actions from the command line.

This variable initializes the XCODE_GENERATE_SCHEME target property on all targets.

New in version 3.11.

If enabled, the Xcode generator will generate only a single Xcode project file for the topmost project() command instead of generating one for every project() command.

This could be useful to speed up the CMake generation step for large projects and to work-around a bug in the ZERO_CHECK logic.

New in version 3.19.

This variable is used to initialize the XCODE_LINK_BUILD_PHASE_MODE property on targets. It affects the methods that the Xcode generator uses to link different kinds of libraries. Its default value is NONE.

New in version 3.13.

Whether to enable Address Sanitizer in the Diagnostics section of the generated Xcode scheme.

This variable initializes the XCODE_SCHEME_ADDRESS_SANITIZER property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.13.

Whether to enable Detect use of stack after return in the Diagnostics section of the generated Xcode scheme.

This variable initializes the XCODE_SCHEME_ADDRESS_SANITIZER_USE_AFTER_RETURN property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.16.

Whether to enable Allow debugging when using document Versions Browser in the Options section of the generated Xcode scheme.

This variable initializes the XCODE_SCHEME_DEBUG_DOCUMENT_VERSIONING property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.13.

Whether to disable the Main Thread Checker in the Diagnostics section of the generated Xcode scheme.

This variable initializes the XCODE_SCHEME_DISABLE_MAIN_THREAD_CHECKER property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.13.

Whether to enable Dynamic Library Loads in the Diagnostics section of the generated Xcode scheme.

This variable initializes the XCODE_SCHEME_DYNAMIC_LIBRARY_LOADS property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.13.

Whether to enable Dynamic Linker API usage in the Diagnostics section of the generated Xcode scheme.

This variable initializes the XCODE_SCHEME_DYNAMIC_LINKER_API_USAGE property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.17.

Specify environment variables that should be added to the Arguments section of the generated Xcode scheme.

If set to a list of environment variables and values of the form MYVAR=value those environment variables will be added to the scheme.

This variable initializes the XCODE_SCHEME_ENVIRONMENT property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.13.

Whether to enable Guard Malloc in the Diagnostics section of the generated Xcode scheme.

This variable initializes the XCODE_SCHEME_GUARD_MALLOC property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.13.

Whether to enable the Main Thread Checker option Pause on issues in the Diagnostics section of the generated Xcode scheme.

This variable initializes the XCODE_SCHEME_MAIN_THREAD_CHECKER_STOP property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.13.

Whether to enable Malloc Guard Edges in the Diagnostics section of the generated Xcode scheme.

This variable initializes the XCODE_SCHEME_MALLOC_GUARD_EDGES property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.13.

Whether to enable Malloc Scribble in the Diagnostics section of the generated Xcode scheme.

This variable initializes the XCODE_SCHEME_MALLOC_SCRIBBLE property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.13.

Whether to enable Malloc Stack in the Diagnostics section of the generated Xcode scheme.

This variable initializes the XCODE_SCHEME_MALLOC_STACK property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.13.

Whether to enable Thread Sanitizer in the Diagnostics section of the generated Xcode scheme.

This variable initializes the XCODE_SCHEME_THREAD_SANITIZER property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.13.

Whether to enable Thread Sanitizer - Pause on issues in the Diagnostics section of the generated Xcode scheme.

This variable initializes the XCODE_SCHEME_THREAD_SANITIZER_STOP property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.13.

Whether to enable Undefined Behavior Sanitizer in the Diagnostics section of the generated Xcode scheme.

This variable initializes the XCODE_SCHEME_UNDEFINED_BEHAVIOUR_SANITIZER property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.13.

Whether to enable Undefined Behavior Sanitizer option Pause on issues in the Diagnostics section of the generated Xcode scheme.

This variable initializes the XCODE_SCHEME_UNDEFINED_BEHAVIOUR_SANITIZER_STOP property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.17.

Specify the Working Directory of the Run and Profile actions in the generated Xcode scheme.

This variable initializes the XCODE_SCHEME_WORKING_DIRECTORY property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.13.

Whether to enable Zombie Objects in the Diagnostics section of the generated Xcode scheme.

This variable initializes the XCODE_SCHEME_ZOMBIE_OBJECTS property on all targets.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.

New in version 3.12.

Calls to find_package(<PackageName>) will search in prefixes specified by the <PackageName>_ROOT CMake variable, where <PackageName> is the name given to the find_package() call and _ROOT is literal. For example, find_package(Foo) will search prefixes specified in the Foo_ROOT CMake variable (if set). See policy CMP0074.

This variable may hold a single prefix or a semicolon-separated list of multiple prefixes.

See also the <PackageName>_ROOT environment variable.

New in version 3.7.

Set to 1 when the target system (CMAKE_SYSTEM_NAME) is Android.

Set to True when the target system is an Apple platform (macOS, iOS, tvOS or watchOS).

True if the Borland compiler is being used.

This is set to true if the Borland compiler is being used.

New in version 3.20.

When Cross Compiling for Android with the NDK and using an Android NDK version 11 or higher, this variable is provided by CMake to report the NDK version number.

Discouraged. Use CMAKE_SIZEOF_VOID_P instead.

Set to a true value when using a Microsoft Visual Studio cl compiler that targets a 64-bit architecture.

Using the Visual Studio 2005 compiler from Microsoft

Set to true when using the Visual Studio 2005 compiler from Microsoft.

True for Apple macOS operating systems.

Set to true when the host system is Apple macOS.

New in version 3.6.

True for Oracle Solaris operating systems.

Set to true when the host system is Oracle Solaris.

Composite Name of OS CMake is being run on.

This variable is the composite of CMAKE_HOST_SYSTEM_NAME and CMAKE_HOST_SYSTEM_VERSION, e.g. ${CMAKE_HOST_SYSTEM_NAME}-${CMAKE_HOST_SYSTEM_VERSION}. If CMAKE_HOST_SYSTEM_VERSION is not set, then this variable is the same as CMAKE_HOST_SYSTEM_NAME.

Name of the OS CMake is running on.

On systems that have the uname command, this variable is set to the output of uname -s. Linux, Windows, and Darwin for macOS are the values found on the big three operating systems.

The name of the CPU CMake is running on.

On Windows, this variable is set to the value of the environment variable PROCESSOR_ARCHITECTURE.

On systems that support uname, this variable is set to the output of:
  • uname -m on GNU, Linux, Cygwin, Android, or
  • arch on OpenBSD, or
  • on other systems,
  • uname -p if its exit code is nonzero, or
  • uname -m otherwise.

The value of uname -m is used by default.

On Apple Silicon hosts, the architecture printed by uname -m may vary based on CMake's own architecture and that of the invoking process tree.

New in version 3.19.2: On Apple Silicon hosts:

  • The CMAKE_APPLE_SILICON_PROCESSOR variable or the CMAKE_APPLE_SILICON_PROCESSOR environment variable may be set to specify the host architecture explicitly.
  • If CMAKE_OSX_ARCHITECTURES is not set, CMake adds explicit flags to tell the compiler to build for the host architecture so the toolchain does not have to guess based on the process tree's architecture.

The OS version CMake is running on.

A numeric version string for the system. On systems that support uname, this variable is set to the output of uname -r. On other systems this is set to major-minor version numbers.

True for UNIX and UNIX like operating systems.

Set to true when the host system is UNIX or UNIX like (i.e. APPLE and CYGWIN).

True if the host system is running Windows, including Windows 64-bit and MSYS.

Set to false on Cygwin.

Target architecture library directory name, if detected.

This is the value of CMAKE_<LANG>_LIBRARY_ARCHITECTURE as detected for one of the enabled languages.

Regex matching possible target architecture library directory names.

This is used to detect CMAKE_<LANG>_LIBRARY_ARCHITECTURE from the implicit linker search path by matching the <arch> name.

Maximum object file full-path length allowed by native build tools.

CMake computes for every source file an object file name that is unique to the source file and deterministic with respect to the full path to the source file. This allows multiple source files in a target to share the same name if they lie in different directories without rebuilding when one is added or removed. However, it can produce long full paths in a few cases, so CMake shortens the path using a hashing scheme when the full path to an object file exceeds a limit. CMake has a built-in limit for each platform that is sufficient for common tools, but some native tools may have a lower limit. This variable may be set to specify the limit explicitly. The value must be an integer no less than 128.

Composite name of operating system CMake is compiling for.

This variable is the composite of CMAKE_SYSTEM_NAME and CMAKE_SYSTEM_VERSION, e.g. ${CMAKE_SYSTEM_NAME}-${CMAKE_SYSTEM_VERSION}. If CMAKE_SYSTEM_VERSION is not set, then this variable is the same as CMAKE_SYSTEM_NAME.

The name of the operating system for which CMake is to build. See the CMAKE_SYSTEM_VERSION variable for the OS version.

Note that CMAKE_SYSTEM_NAME is not set to anything by default when running in script mode, since it's not building anything.

CMAKE_SYSTEM_NAME is by default set to the same value as the CMAKE_HOST_SYSTEM_NAME variable so that the build targets the host system.

CMAKE_SYSTEM_NAME may be set explicitly when first configuring a new build tree in order to enable cross compiling. In this case the CMAKE_SYSTEM_VERSION variable must also be set explicitly.

When not cross-compiling, this variable has the same value as the CMAKE_HOST_SYSTEM_PROCESSOR variable. In many cases, this will correspond to the target architecture for the build, but this is not guaranteed. (E.g. on Windows, the host may be AMD64 even when using a MSVC cl compiler with a 32-bit target.)

When cross-compiling, a CMAKE_TOOLCHAIN_FILE should set the CMAKE_SYSTEM_PROCESSOR variable to match target architecture that it specifies (via CMAKE_<LANG>_COMPILER and perhaps CMAKE_<LANG>_COMPILER_TARGET).

The version of the operating system for which CMake is to build. See the CMAKE_SYSTEM_NAME variable for the OS name.

When the CMAKE_SYSTEM_NAME variable takes its default value then CMAKE_SYSTEM_VERSION is by default set to the same value as the CMAKE_HOST_SYSTEM_VERSION variable so that the build targets the host system version.

In the case of a host build then CMAKE_SYSTEM_VERSION may be set explicitly when first configuring a new build tree in order to enable targeting the build for a different version of the host operating system than is actually running on the host. This is allowed and not considered cross compiling so long as the binaries built for the specified OS version can still run on the host.

When the CMAKE_SYSTEM_NAME variable is set explicitly to enable cross compiling then the value of CMAKE_SYSTEM_VERSION must also be set explicitly to specify the target system version.

True for Cygwin.

Set to true when using Cygwin.

New in version 3.3.

True when using Green Hills MULTI generator.

New in version 3.14.

Set to 1 when the target system (CMAKE_SYSTEM_NAME) is iOS.

New in version 3.2.

True when using MinGW

Set to true when the compiler is some version of MinGW.

Set to true when the compiler is some version of Microsoft Visual C++ or another compiler simulating the Visual C++ cl command-line syntax.

See also the MSVC_VERSION variable.

Discouraged. Use the MSVC_VERSION variable instead.

True when using the Microsoft Visual Studio v100 toolset (cl version 16) or another compiler that simulates it.

Discouraged. Use the MSVC_VERSION variable instead.

True when using the Microsoft Visual Studio v110 toolset (cl version 17) or another compiler that simulates it.

Discouraged. Use the MSVC_VERSION variable instead.

True when using the Microsoft Visual Studio v120 toolset (cl version 18) or another compiler that simulates it.

New in version 3.1.

Discouraged. Use the MSVC_VERSION variable instead.

True when using the Microsoft Visual Studio v140 or v141 toolset (cl version 19) or another compiler that simulates it.

Discouraged. Use the MSVC_VERSION variable instead.

True when using Microsoft Visual C++ 6.0.

Set to true when the compiler is version 6.0 of Microsoft Visual C++.

Discouraged. Use the MSVC_VERSION variable instead.

True when using Microsoft Visual C++ 7.0.

Set to true when the compiler is version 7.0 of Microsoft Visual C++.

Discouraged. Use the MSVC_VERSION variable instead.

True when using Microsoft Visual C++ 7.1.

Set to true when the compiler is version 7.1 of Microsoft Visual C++.

Discouraged. Use the MSVC_VERSION variable instead.

True when using the Microsoft Visual Studio v80 toolset (cl version 14) or another compiler that simulates it.

Discouraged. Use the MSVC_VERSION variable instead.

True when using the Microsoft Visual Studio v90 toolset (cl version 15) or another compiler that simulates it.

True when using the Microsoft Visual C++ IDE.

Set to true when the target platform is the Microsoft Visual C++ IDE, as opposed to the command line compiler.

NOTE:

This variable is only available after compiler detection has been performed, so it is not available to toolchain files or before the first project() or enable_language() call which uses an MSVC-like compiler.

New in version 3.12.

The toolset version of Microsoft Visual C/C++ being used if any. If MSVC-like is being used, this variable is set based on the version of the compiler as given by the MSVC_VERSION variable.

Known toolset version numbers are:

80        = VS 2005 (8.0)
90        = VS 2008 (9.0)
100       = VS 2010 (10.0)
110       = VS 2012 (11.0)
120       = VS 2013 (12.0)
140       = VS 2015 (14.0)
141       = VS 2017 (15.0)
142       = VS 2019 (16.0)

Compiler versions newer than those known to CMake will be reported as the latest known toolset version.

See also the MSVC_VERSION variable.

The version of Microsoft Visual C/C++ being used if any. If a compiler simulating Visual C++ is being used, this variable is set to the toolset version simulated as given by the _MSC_VER preprocessor definition.

Known version numbers are:

1200      = VS  6.0
1300      = VS  7.0
1310      = VS  7.1
1400      = VS  8.0 (v80 toolset)
1500      = VS  9.0 (v90 toolset)
1600      = VS 10.0 (v100 toolset)
1700      = VS 11.0 (v110 toolset)
1800      = VS 12.0 (v120 toolset)
1900      = VS 14.0 (v140 toolset)
1910-1919 = VS 15.0 (v141 toolset)
1920-1929 = VS 16.0 (v142 toolset)
1930-1939 = VS 17.0 (v143 toolset)

See also the CMAKE_<LANG>_COMPILER_VERSION and MSVC_TOOLSET_VERSION variable.

New in version 3.14.

True when using the MSYS Makefiles generator.

Set to True when the target system is UNIX or UNIX-like (e.g. APPLE and CYGWIN). The CMAKE_SYSTEM_NAME variable should be queried if a more specific understanding of the target system is required.

Set to True when the target system is Windows, including Win64.

New in version 3.1.

True when the CMAKE_SYSTEM_NAME variable is set to WindowsCE.

New in version 3.1.

True when the CMAKE_SYSTEM_NAME variable is set to WindowsPhone.

New in version 3.1.

True when the CMAKE_SYSTEM_NAME variable is set to WindowsStore.

New in version 3.7.

True when using Xcode generator.

Version of Xcode (Xcode generator only).

Under the Xcode generator, this is the version of Xcode as specified in Xcode.app/Contents/version.plist (such as 3.1.2).

New in version 3.17.

Default value for AIX_EXPORT_ALL_SYMBOLS target property. This variable is used to initialize the property on each target as it is created.

New in version 3.4.

Default value for the ANDROID_ANT_ADDITIONAL_OPTIONS target property. See that target property for additional information.

New in version 3.1.

When Cross Compiling for Android with NVIDIA Nsight Tegra Visual Studio Edition, this variable may be set to specify the default value for the ANDROID_API target property. See that target property for additional information.

Otherwise, when Cross Compiling for Android, this variable provides the Android API version number targeted. This will be the same value as the CMAKE_SYSTEM_VERSION variable for Android platforms.

New in version 3.2.

Default value for the ANDROID_API_MIN target property. See that target property for additional information.

New in version 3.4.

When Cross Compiling for Android with NVIDIA Nsight Tegra Visual Studio Edition, this variable may be set to specify the default value for the ANDROID_ARCH target property. See that target property for additional information.

Otherwise, when Cross Compiling for Android, this variable provides the name of the Android architecture corresponding to the value of the CMAKE_ANDROID_ARCH_ABI variable. The architecture name may be one of:

  • arm
  • arm64
  • mips
  • mips64
  • x86
  • x86_64

New in version 3.7.

When Cross Compiling for Android, this variable specifies the target architecture and ABI to be used. Valid values are:

  • arm64-v8a
  • armeabi-v7a
  • armeabi-v6
  • armeabi
  • mips
  • mips64
  • x86
  • x86_64

See also the CMAKE_ANDROID_ARM_MODE and CMAKE_ANDROID_ARM_NEON variables.

New in version 3.7.

When Cross Compiling for Android and CMAKE_ANDROID_ARCH_ABI is set to one of the armeabi architectures, set CMAKE_ANDROID_ARM_MODE to ON to target 32-bit ARM processors (-marm). Otherwise, the default is to target the 16-bit Thumb processors (-mthumb).

New in version 3.7.

When Cross Compiling for Android and CMAKE_ANDROID_ARCH_ABI is set to armeabi-v7a set CMAKE_ANDROID_ARM_NEON to ON to target ARM NEON devices.

New in version 3.4.

Default value for the ANDROID_ASSETS_DIRECTORIES target property. See that target property for additional information.

New in version 3.20.

When Cross Compiling for Android with the NDK, this variable may be set to specify whether exceptions are enabled.

New in version 3.1.

Default value for the ANDROID_GUI target property of executables. See that target property for additional information.

New in version 3.4.

Default value for the ANDROID_JAR_DEPENDENCIES target property. See that target property for additional information.

New in version 3.4.

Default value for the ANDROID_JAR_DIRECTORIES target property. See that target property for additional information.

New in version 3.4.

Default value for the ANDROID_JAVA_SOURCE_DIR target property. See that target property for additional information.

New in version 3.4.

Default value for the ANDROID_NATIVE_LIB_DEPENDENCIES target property. See that target property for additional information.

New in version 3.4.

Default value for the ANDROID_NATIVE_LIB_DIRECTORIES target property. See that target property for additional information.

New in version 3.7.

When Cross Compiling for Android with the NDK, this variable holds the absolute path to the root directory of the NDK. The directory must contain a platforms subdirectory holding the android-<api> directories.

New in version 3.9.

When Cross Compiling for Android with the NDK, this variable may be set to specify whether to use the deprecated per-api-level headers instead of the unified headers.

If not specified, the default will be false if using a NDK version that provides the unified headers and true otherwise.

New in version 3.7.1.

When Cross Compiling for Android with the NDK, this variable provides the NDK's "host tag" used to construct the path to prebuilt toolchains that run on the host.

New in version 3.7.

When Cross Compiling for Android with the NDK, this variable may be set to specify the version of the toolchain to be used as the compiler.

On NDK r19 or above, this variable must be unset or set to clang.

On NDK r18 or below, this variable must be set to one of these forms:

  • <major>.<minor>: GCC of specified version
  • clang<major>.<minor>: Clang of specified version
  • clang: Clang of most recent available version

A toolchain of the requested version will be selected automatically to match the ABI named in the CMAKE_ANDROID_ARCH_ABI variable.

If not specified, the default will be a value that selects the latest available GCC toolchain.

New in version 3.4.

Default value for the ANDROID_PROCESS_MAX target property. See that target property for additional information.

New in version 3.4.

Default value for the ANDROID_PROGUARD target property. See that target property for additional information.

New in version 3.4.

Default value for the ANDROID_PROGUARD_CONFIG_PATH target property. See that target property for additional information.

New in version 3.20.

When Cross Compiling for Android with the NDK, this variable may be set to specify whether RTTI is enabled.

New in version 3.4.

Default value for the ANDROID_SECURE_PROPS_PATH target property. See that target property for additional information.

New in version 3.4.

Default value for the ANDROID_SKIP_ANT_STEP target property. See that target property for additional information.

New in version 3.7.

When Cross Compiling for Android with a Standalone Toolchain, this variable holds the absolute path to the root directory of the toolchain. The specified directory must contain a sysroot subdirectory.

New in version 3.4.

When Cross Compiling for Android with NVIDIA Nsight Tegra Visual Studio Edition, this variable may be set to specify the default value for the ANDROID_STL_TYPE target property. See that target property for additional information.

When Cross Compiling for Android with the NDK, this variable may be set to specify the STL variant to be used. The value may be one of:

none
No C++ Support
system
Minimal C++ without STL
gabi++_static
GAbi++ Static
gabi++_shared
GAbi++ Shared
gnustl_static
GNU libstdc++ Static
gnustl_shared
GNU libstdc++ Shared
c++_static
LLVM libc++ Static
c++_shared
LLVM libc++ Shared
stlport_static
STLport Static
stlport_shared
STLport Shared

The default value is gnustl_static on NDK versions that provide it and otherwise c++_static. Note that this default differs from the native NDK build system because CMake may be used to build projects for Android that are not natively implemented for it and use the C++ standard library.

New in version 3.19.2.

On Apple Silicon hosts running macOS, set this variable to tell CMake what architecture to use for CMAKE_HOST_SYSTEM_PROCESSOR. The value must be either arm64 or x86_64.

The value of this variable should never be modified by project code. It is meant to be set as a cache entry provided by the user, e.g. via -DCMAKE_APPLE_SILICON_PROCESSOR=....

See also the CMAKE_APPLE_SILICON_PROCESSOR environment variable.

Where to put all the ARCHIVE target files when built.

This variable is used to initialize the ARCHIVE_OUTPUT_DIRECTORY property on all the targets. See that target property for additional information.

New in version 3.3.

Where to put all the ARCHIVE target files when built for a specific configuration.

This variable is used to initialize the ARCHIVE_OUTPUT_DIRECTORY_<CONFIG> property on all the targets. See that target property for additional information.

New in version 3.14.

Switch for forwarding origin target dependencies to the corresponding _autogen targets.

This variable is used to initialize the AUTOGEN_ORIGIN_DEPENDS property on all the targets. See that target property for additional information.

By default CMAKE_AUTOGEN_ORIGIN_DEPENDS is ON.

New in version 3.11.

Number of parallel moc or uic processes to start when using AUTOMOC and AUTOUIC.

This variable is used to initialize the AUTOGEN_PARALLEL property on all the targets. See that target property for additional information.

By default CMAKE_AUTOGEN_PARALLEL is unset.

New in version 3.13.

Sets the verbosity of AUTOMOC, AUTOUIC and AUTORCC. A positive integer value or a true boolean value lets the AUTO* generators output additional processing information.

Setting CMAKE_AUTOGEN_VERBOSE has the same effect as setting the VERBOSE environment variable during generation (e.g. by calling make VERBOSE=1). The extra verbosity is limited to the AUTO* generators though.

By default CMAKE_AUTOGEN_VERBOSE is unset.

Whether to handle moc automatically for Qt targets.

This variable is used to initialize the AUTOMOC property on all the targets. See that target property for additional information.

New in version 3.10.

This variable is used to initialize the AUTOMOC_COMPILER_PREDEFINES property on all the targets. See that target property for additional information.

By default it is ON.

New in version 3.9.

Filter definitions used by CMAKE_AUTOMOC to extract file names from source code as additional dependencies for the moc file.

This variable is used to initialize the AUTOMOC_DEPEND_FILTERS property on all the targets. See that target property for additional information.

By default it is empty.

New in version 3.10.

Semicolon-separated list list of macro names used by CMAKE_AUTOMOC to determine if a C++ file needs to be processed by moc.

This variable is used to initialize the AUTOMOC_MACRO_NAMES property on all the targets. See that target property for additional information.

The default value is Q_OBJECT;Q_GADGET;Q_NAMESPACE;Q_NAMESPACE_EXPORT.

Let CMake know that source files that contain CUSTOM_MACRO must be moc processed as well:
set(CMAKE_AUTOMOC ON)
list(APPEND CMAKE_AUTOMOC_MACRO_NAMES "CUSTOM_MACRO")

Additional options for moc when using CMAKE_AUTOMOC.

This variable is used to initialize the AUTOMOC_MOC_OPTIONS property on all the targets. See that target property for additional information.

New in version 3.16.

Whether to generate the -p path prefix option for moc on AUTOMOC enabled Qt targets.

This variable is used to initialize the AUTOMOC_PATH_PREFIX property on all the targets. See that target property for additional information.

The default value is OFF.

Whether to handle rcc automatically for Qt targets.

This variable is used to initialize the AUTORCC property on all the targets. See that target property for additional information.

Additional options for rcc when using CMAKE_AUTORCC.

This variable is used to initialize the AUTORCC_OPTIONS property on all the targets. See that target property for additional information.

# ...
set(CMAKE_AUTORCC_OPTIONS "--compress;9")
# ...

Whether to handle uic automatically for Qt targets.

This variable is used to initialize the AUTOUIC property on all the targets. See that target property for additional information.

Additional options for uic when using CMAKE_AUTOUIC.

This variable is used to initialize the AUTOUIC_OPTIONS property on all the targets. See that target property for additional information.

# ...
set_property(CMAKE_AUTOUIC_OPTIONS "--no-protection")
# ...

New in version 3.9.

Search path list used by CMAKE_AUTOUIC to find included .ui files.

This variable is used to initialize the AUTOUIC_SEARCH_PATHS property on all the targets. See that target property for additional information.

By default it is empty.

New in version 3.8.

Semicolon-separated list specifying runtime path (RPATH) entries to add to binaries linked in the build tree (for platforms that support it). The entries will not be used for binaries in the install tree. See also the CMAKE_INSTALL_RPATH variable.

This is used to initialize the BUILD_RPATH target property for all targets.

New in version 3.14.

Whether to use relative paths for the build RPATH.

This is used to initialize the BUILD_RPATH_USE_ORIGIN target property for all targets, see that property for more details.

New in version 3.9.

Whether to use INSTALL_NAME_DIR on targets in the build tree.

This variable is used to initialize the BUILD_WITH_INSTALL_NAME_DIR property on all targets.

Use the install path for the RPATH.

Normally CMake uses the build tree for the RPATH when building executables etc on systems that use RPATH. When the software is installed the executables etc are relinked by CMake to have the install RPATH. If this variable is set to true then the software is always built with the install path for the RPATH and does not need to be relinked when installed.

New in version 3.1.

Output directory for MS debug symbol .pdb files generated by the compiler while building source files.

This variable is used to initialize the COMPILE_PDB_OUTPUT_DIRECTORY property on all the targets.

New in version 3.1.

Per-configuration output directory for MS debug symbol .pdb files generated by the compiler while building source files.

This is a per-configuration version of CMAKE_COMPILE_PDB_OUTPUT_DIRECTORY. This variable is used to initialize the COMPILE_PDB_OUTPUT_DIRECTORY_<CONFIG> property on all the targets.

Default filename postfix for libraries under configuration <CONFIG>.

When a non-executable target is created its <CONFIG>_POSTFIX target property is initialized with the value of this variable if it is set.

New in version 3.17.

Specifies a semicolon-separated list of configurations available from all build-<Config>.ninja files in the Ninja Multi-Config generator. This variable activates cross-config mode. Targets from each config specified in this variable can be built from any build-<Config>.ninja file. Custom commands will use the configuration native to build-<Config>.ninja. If it is set to all, all configurations from CMAKE_CONFIGURATION_TYPES are cross-configs. If it is not specified, or empty, each build-<Config>.ninja file will only contain build rules for its own configuration.

The value of this variable must be a subset of CMAKE_CONFIGURATION_TYPES.

New in version 3.17.

Set this to a semicolon-separated list of command-line arguments to pass to ctest(1) when running tests through the test (or RUN_TESTS) target of the generated build system.

New in version 3.16.

Default value for CUDA_RESOLVE_DEVICE_SYMBOLS target property. This variable is used to initialize the property on each target as it is created.

New in version 3.17.

Select the CUDA runtime library for use when compiling and linking CUDA. This variable is used to initialize the CUDA_RUNTIME_LIBRARY property on all targets as they are created.

The allowed case insensitive values are:

None
Link with -cudart=none or equivalent flag(s) to use no CUDA runtime library.
Shared
Link with -cudart=shared or equivalent flag(s) to use a dynamically-linked CUDA runtime library.
Static
Link with -cudart=static or equivalent flag(s) to use a statically-linked CUDA runtime library.

Contents of CMAKE_CUDA_RUNTIME_LIBRARY may use generator expressions.

If this variable is not set then the CUDA_RUNTIME_LIBRARY target property will not be set automatically. If that property is not set then CMake uses an appropriate default value based on the compiler to select the CUDA runtime library.

NOTE:

This property has effect only when the CUDA language is enabled. To control the CUDA runtime linking when only using the CUDA SDK with the C or C++ language we recommend using the FindCUDAToolkit module.

New in version 3.11.

Default value for CUDA_SEPARABLE_COMPILATION target property. This variable is used to initialize the property on each target as it is created.

See variable CMAKE_<CONFIG>_POSTFIX.

This variable is a special case of the more-general CMAKE_<CONFIG>_POSTFIX variable for the DEBUG configuration.

New in version 3.17.

Specifies the configuration to use by default in a build.ninja file in the Ninja Multi-Config generator. If this variable is specified, build.ninja uses build rules from build-<Config>.ninja by default. All custom commands are executed with this configuration. If the variable is not specified, the first item from CMAKE_CONFIGURATION_TYPES is used instead.

The value of this variable must be one of the items from CMAKE_CONFIGURATION_TYPES.

New in version 3.17.

Specifies a semicolon-separated list of configurations to build for a target in build.ninja if no :<Config> suffix is specified in the Ninja Multi-Config generator. If it is set to all, all configurations from CMAKE_CROSS_CONFIGS are used. If it is not specified, it defaults to CMAKE_DEFAULT_BUILD_TYPE.

For example, if you set CMAKE_DEFAULT_BUILD_TYPE to Release, but set CMAKE_DEFAULT_CONFIGS to Debug or all, all <target> aliases in build.ninja will resolve to <target>:Debug or <target>:all, but custom commands will still use the Release configuration.

The value of this variable must be a subset of CMAKE_CROSS_CONFIGS or be the same as CMAKE_DEFAULT_BUILD_TYPE. It must not be specified if CMAKE_DEFAULT_BUILD_TYPE or CMAKE_CROSS_CONFIGS is not used.

New in version 3.16.

Default value for DISABLE_PRECOMPILE_HEADERS of targets.

By default CMAKE_DISABLE_PRECOMPILE_HEADERS is OFF.

New in version 3.20.

For the Makefile Generators, source dependencies are now, for a selection of compilers, generated by the compiler itself. By defining this variable with value FALSE, you can restore the legacy behavior (i.e. using CMake for dependencies discovery).

New in version 3.4.

Specify whether executables export symbols for loadable modules.

This variable is used to initialize the ENABLE_EXPORTS target property for executable targets when they are created by calls to the add_executable() command. See the property documentation for details.

Linker flags to be used to create executables.

These flags will be used by the linker when creating an executable.

Flags to be used when linking an executable.

Same as CMAKE_C_FLAGS_* but used by the linker when creating executables.

New in version 3.7.

Value used to initialize the CMAKE_EXE_LINKER_FLAGS_<CONFIG> cache entry the first time a build tree is configured. This variable is meant to be set by a toolchain file. CMake may prepend or append content to the value based on the environment and target platform.

See also CMAKE_EXE_LINKER_FLAGS_INIT.

New in version 3.7.

Value used to initialize the CMAKE_EXE_LINKER_FLAGS cache entry the first time a build tree is configured. This variable is meant to be set by a toolchain file. CMake may prepend or append content to the value based on the environment and target platform.

See also the configuration-specific variable CMAKE_EXE_LINKER_FLAGS_<CONFIG>_INIT.

New in version 3.12.

Set the folder name. Use to organize targets in an IDE.

This variable is used to initialize the FOLDER property on all the targets. See that target property for additional information.

New in version 3.15.

Default value for FRAMEWORK of targets.

This variable is used to initialize the FRAMEWORK property on all the targets. See that target property for additional information.

New in version 3.18.

Default framework filename postfix under configuration <CONFIG> when using a multi-config generator.

When a framework target is created its FRAMEWORK_MULTI_CONFIG_POSTFIX_<CONFIG> target property is initialized with the value of this variable if it is set.

Set to FIXED or FREE to indicate the Fortran source layout.

This variable is used to initialize the Fortran_FORMAT property on all the targets. See that target property for additional information.

Fortran module output directory.

This variable is used to initialize the Fortran_MODULE_DIRECTORY property on all the targets. See that target property for additional information.

New in version 3.18.

Default value for Fortran_PREPROCESS of targets.

This variable is used to initialize the Fortran_PREPROCESS property on all the targets. See that target property for additional information.

New in version 3.14.

ON / OFF boolean to control if the project file for a target should be one single file or multiple files. Refer to GHS_NO_SOURCE_GROUP_FILE for further details.

New in version 3.14.

Switch to enable generation of a global autogen target.

When CMAKE_GLOBAL_AUTOGEN_TARGET is enabled, a custom target autogen is generated. This target depends on all AUTOMOC and AUTOUIC generated <ORIGIN>_autogen targets in the project. By building the global autogen target, all AUTOMOC and AUTOUIC files in the project will be generated.

The name of the global autogen target can be changed by setting CMAKE_GLOBAL_AUTOGEN_TARGET_NAME.

By default CMAKE_GLOBAL_AUTOGEN_TARGET is unset.

See the cmake-qt(7) manual for more information on using CMake with Qt.

<ORIGIN>_autogen targets by default inherit their origin target's dependencies. This might result in unintended dependency target builds when only <ORIGIN>_autogen targets are built. A solution is to disable AUTOGEN_ORIGIN_DEPENDS on the respective origin targets.

New in version 3.14.

Change the name of the global autogen target.

When CMAKE_GLOBAL_AUTOGEN_TARGET is enabled, a global custom target named autogen is created. CMAKE_GLOBAL_AUTOGEN_TARGET_NAME allows to set a different name for that target.

By default CMAKE_GLOBAL_AUTOGEN_TARGET_NAME is unset.

See the cmake-qt(7) manual for more information on using CMake with Qt.

New in version 3.14.

Switch to enable generation of a global autorcc target.

When CMAKE_GLOBAL_AUTORCC_TARGET is enabled, a custom target autorcc is generated. This target depends on all AUTORCC generated <ORIGIN>_arcc_<QRC> targets in the project. By building the global autorcc target, all AUTORCC files in the project will be generated.

The name of the global autorcc target can be changed by setting CMAKE_GLOBAL_AUTORCC_TARGET_NAME.

By default CMAKE_GLOBAL_AUTORCC_TARGET is unset.

See the cmake-qt(7) manual for more information on using CMake with Qt.

New in version 3.14.

Change the name of the global autorcc target.

When CMAKE_GLOBAL_AUTORCC_TARGET is enabled, a global custom target named autorcc is created. CMAKE_GLOBAL_AUTORCC_TARGET_NAME allows to set a different name for that target.

By default CMAKE_GLOBAL_AUTOGEN_TARGET_NAME is unset.

See the cmake-qt(7) manual for more information on using CMake with Qt.

Convert GNU import libraries (.dll.a) to MS format (.lib).

This variable is used to initialize the GNUtoMS property on targets when they are created. See that target property for additional information.

Automatically add the current source and build directories to the include path.

If this variable is enabled, CMake automatically adds CMAKE_CURRENT_SOURCE_DIR and CMAKE_CURRENT_BINARY_DIR to the include path for each directory. These additional include directories do not propagate down to subdirectories. This is useful mainly for out-of-source builds, where files generated into the build tree are included by files located in the source tree.

By default CMAKE_INCLUDE_CURRENT_DIR is OFF.

Automatically add the current source and build directories to the INTERFACE_INCLUDE_DIRECTORIES target property.

If this variable is enabled, CMake automatically adds for each shared library target, static library target, module target and executable target, CMAKE_CURRENT_SOURCE_DIR and CMAKE_CURRENT_BINARY_DIR to the INTERFACE_INCLUDE_DIRECTORIES target property. By default CMAKE_INCLUDE_CURRENT_DIR_IN_INTERFACE is OFF.

Directory name for installed targets on Apple platforms.

CMAKE_INSTALL_NAME_DIR is used to initialize the INSTALL_NAME_DIR property on all targets. See that target property for more information.

New in version 3.16.

Sets the default for whether toolchain-defined rpaths should be removed during installation.

CMAKE_INSTALL_REMOVE_ENVIRONMENT_RPATH is a boolean that provides the default value for the INSTALL_REMOVE_ENVIRONMENT_RPATH property of all subsequently created targets.

The rpath to use for installed targets.

A semicolon-separated list specifying the rpath to use in installed targets (for platforms that support it). This is used to initialize the target property INSTALL_RPATH for all targets.

Add paths to linker search and installed rpath.

CMAKE_INSTALL_RPATH_USE_LINK_PATH is a boolean that if set to True will append to the runtime search path (rpath) of installed binaries any directories outside the project that are in the linker search path or contain linked library files. The directories are appended after the value of the INSTALL_RPATH target property.

This variable is used to initialize the target property INSTALL_RPATH_USE_LINK_PATH for all targets.

New in version 3.9.

Default value for INTERPROCEDURAL_OPTIMIZATION of targets.

This variable is used to initialize the INTERPROCEDURAL_OPTIMIZATION property on all the targets. See that target property for additional information.

New in version 3.9.

Default value for INTERPROCEDURAL_OPTIMIZATION_<CONFIG> of targets.

This variable is used to initialize the INTERPROCEDURAL_OPTIMIZATION_<CONFIG> property on all the targets. See that target property for additional information.

New in version 3.5.

Default value for IOS_INSTALL_COMBINED of targets.

This variable is used to initialize the IOS_INSTALL_COMBINED property on all the targets. See that target property for additional information.

New in version 3.6.

Default value for <LANG>_CLANG_TIDY target property when <LANG> is C, CXX, OBJC or OBJCXX.

This variable is used to initialize the property on each target as it is created. For example:

set(CMAKE_CXX_CLANG_TIDY clang-tidy -checks=-*,readability-*)
add_executable(foo foo.cxx)

New in version 3.4.

Default value for <LANG>_COMPILER_LAUNCHER target property. This variable is used to initialize the property on each target as it is created. This is done only when <LANG> is C, CXX, Fortran, HIP, ISPC, OBJC, OBJCXX, or CUDA.

This variable is initialized to the CMAKE_<LANG>_COMPILER_LAUNCHER environment variable if it is set.

New in version 3.10.

Default value for <LANG>_CPPCHECK target property. This variable is used to initialize the property on each target as it is created. This is done only when <LANG> is C or CXX.

New in version 3.8.

Default value for <LANG>_CPPLINT target property. This variable is used to initialize the property on each target as it is created. This is done only when <LANG> is C or CXX.

New in version 3.3.

Default value for <LANG>_INCLUDE_WHAT_YOU_USE target property. This variable is used to initialize the property on each target as it is created. This is done only when <LANG> is C or CXX.

New in version 3.21.

Default value for <LANG>_LINKER_LAUNCHER target property. This variable is used to initialize the property on each target as it is created. This is done only when <LANG> is C, CXX, OBJC, or OBJCXX.

This variable is initialized to the CMAKE_<LANG>_LINKER_LAUNCHER environment variable if it is set.

New in version 3.16.

Language-specific flag to be used to link a library specified by a path to its file.

The flag will be used before a library file path is given to the linker. This is needed only on very few platforms.

New in version 3.16.

Flag to be used to link a library into a shared library or executable.

This flag will be used to specify a library to link to a shared library or an executable for the specific language. On most compilers this is -l.

Default value for the <LANG>_VISIBILITY_PRESET target property when a target is created.

Where to put all the LIBRARY target files when built.

This variable is used to initialize the LIBRARY_OUTPUT_DIRECTORY property on all the targets. See that target property for additional information.

New in version 3.3.

Where to put all the LIBRARY target files when built for a specific configuration.

This variable is used to initialize the LIBRARY_OUTPUT_DIRECTORY_<CONFIG> property on all the targets. See that target property for additional information.

The flag to be used to add a library search path to a compiler.

The flag will be used to specify a library directory to the compiler. On most compilers this is -L.

Linker flag to be used to specify a .def file for dll creation.

The flag will be used to add a .def file when creating a dll on Windows; this is only defined on Windows.

Whether to skip link dependencies on shared library files.

This variable initializes the LINK_DEPENDS_NO_SHARED property on targets when they are created. See that target property for additional information.

Default value for LINK_INTERFACE_LIBRARIES of targets.

This variable is used to initialize the LINK_INTERFACE_LIBRARIES property on all the targets. See that target property for additional information.

Flag to be used to link a library specified by a path to its file.

The flag will be used before a library file path is given to the linker. This is needed only on very few platforms.

Flag to be used to link a library into an executable.

The flag will be used to specify a library to link to an executable. On most compilers this is -l.

New in version 3.7.

Default value for LINK_WHAT_YOU_USE target property. This variable is used to initialize the property on each target as it is created.

Default value for MACOSX_BUNDLE of targets.

This variable is used to initialize the MACOSX_BUNDLE property on all the targets. See that target property for additional information.

This variable is set to ON by default if CMAKE_SYSTEM_NAME equals to iOS, tvOS or watchOS.

Whether to use rpaths on macOS and iOS.

This variable is used to initialize the MACOSX_RPATH property on all targets.

Default value for MAP_IMPORTED_CONFIG_<CONFIG> of targets.

This variable is used to initialize the MAP_IMPORTED_CONFIG_<CONFIG> property on all the targets. See that target property for additional information.

Linker flags to be used to create modules.

These flags will be used by the linker when creating a module.

Flags to be used when linking a module.

Same as CMAKE_C_FLAGS_* but used by the linker when creating modules.

New in version 3.7.

Value used to initialize the CMAKE_MODULE_LINKER_FLAGS_<CONFIG> cache entry the first time a build tree is configured. This variable is meant to be set by a toolchain file. CMake may prepend or append content to the value based on the environment and target platform.

See also CMAKE_MODULE_LINKER_FLAGS_INIT.

New in version 3.7.

Value used to initialize the CMAKE_MODULE_LINKER_FLAGS cache entry the first time a build tree is configured. This variable is meant to be set by a toolchain file. CMake may prepend or append content to the value based on the environment and target platform.

See also the configuration-specific variable CMAKE_MODULE_LINKER_FLAGS_<CONFIG>_INIT.

New in version 3.10.

Extra PATH locations that should be used when executing add_custom_command() or add_custom_target() when using the Visual Studio 9 2008 (or above) generator. This allows for running commands and using dll's that the IDE environment is not aware of.

If not set explicitly the value is initialized by the CMAKE_MSVCIDE_RUN_PATH environment variable, if set, and otherwise left empty.

New in version 3.15.

Select the MSVC runtime library for use by compilers targeting the MSVC ABI. This variable is used to initialize the MSVC_RUNTIME_LIBRARY property on all targets as they are created. It is also propagated by calls to the try_compile() command into the test project.

The allowed values are:

MultiThreaded
Compile with -MT or equivalent flag(s) to use a multi-threaded statically-linked runtime library.
MultiThreadedDLL
Compile with -MD or equivalent flag(s) to use a multi-threaded dynamically-linked runtime library.
MultiThreadedDebug
Compile with -MTd or equivalent flag(s) to use a multi-threaded statically-linked runtime library.
MultiThreadedDebugDLL
Compile with -MDd or equivalent flag(s) to use a multi-threaded dynamically-linked runtime library.

The value is ignored on non-MSVC compilers but an unsupported value will be rejected as an error when using a compiler targeting the MSVC ABI.

The value may also be the empty string ("") in which case no runtime library selection flag will be added explicitly by CMake. Note that with Visual Studio Generators the native build system may choose to add its own default runtime library selection flag.

Use generator expressions to support per-configuration specification. For example, the code:

set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")

selects for all following targets a multi-threaded statically-linked runtime library with or without debug information depending on the configuration.

If this variable is not set then the MSVC_RUNTIME_LIBRARY target property will not be set automatically. If that property is not set then CMake uses the default value MultiThreaded$<$<CONFIG:Debug>:Debug>DLL to select a MSVC runtime library.

NOTE:

This variable has effect only when policy CMP0091 is set to NEW prior to the first project() or enable_language() command that enables a language using a compiler targeting the MSVC ABI.

New in version 3.6.

Set output files path prefix for the Ninja generator.

Every output files listed in the generated build.ninja will be prefixed by the contents of this variable (a trailing slash is appended if missing). This is useful when the generated ninja file is meant to be embedded as a subninja file into a super ninja project. For example, a ninja build file generated with a command like:

cd top-build-dir/sub &&
cmake -G Ninja -DCMAKE_NINJA_OUTPUT_PATH_PREFIX=sub/ path/to/source

can be embedded in top-build-dir/build.ninja with a directive like this:

subninja sub/build.ninja

The auto-regeneration rule in top-build-dir/build.ninja must have an order-only dependency on sub/build.ninja.

NOTE:

When CMAKE_NINJA_OUTPUT_PATH_PREFIX is set, the project generated by CMake cannot be used as a standalone project. No default targets are specified.

Do not use the builtin binary editor to fix runtime library search paths on installation.

When an ELF or XCOFF binary needs to have a different runtime library search path after installation than it does in the build tree, CMake uses a builtin editor to change the runtime search path in the installed copy. If this variable is set to true then CMake will relink the binary before installation instead of using its builtin editor.

New in version 3.20: This variable also applies to XCOFF binaries' LIBPATH. Prior to the addition of the XCOFF editor in CMake 3.20, this variable applied only to ELF binaries' RPATH/RUNPATH.

Default value for NO_SYSTEM_FROM_IMPORTED of targets.

This variable is used to initialize the NO_SYSTEM_FROM_IMPORTED property on all the targets. See that target property for additional information.

New in version 3.19.

Initializes the OPTIMIZE_DEPENDENCIES target property.

Target specific architectures for macOS and iOS.

This variable is used to initialize the OSX_ARCHITECTURES property on each target as it is created. See that target property for additional information.

The value of this variable should be set prior to the first project() or enable_language() command invocation because it may influence configuration of the toolchain and flags. It is intended to be set locally by the user creating a build tree. This variable should be set as a CACHE entry (or else CMake may remove it while initializing a cache entry of the same name).

Despite the OSX part in the variable name(s) they apply also to other SDKs than macOS like iOS, tvOS, or watchOS.

This variable is ignored on platforms other than Apple.

Specify the minimum version of the target platform (e.g. macOS or iOS) on which the target binaries are to be deployed. CMake uses this variable value for the -mmacosx-version-min flag or their respective target platform equivalents. For older Xcode versions that shipped multiple macOS SDKs this variable also helps to choose the SDK in case CMAKE_OSX_SYSROOT is unset.

If not set explicitly the value is initialized by the MACOSX_DEPLOYMENT_TARGET environment variable, if set, and otherwise computed based on the host platform.

The value of this variable should be set prior to the first project() or enable_language() command invocation because it may influence configuration of the toolchain and flags. It is intended to be set locally by the user creating a build tree. This variable should be set as a CACHE entry (or else CMake may remove it while initializing a cache entry of the same name).

Despite the OSX part in the variable name(s) they apply also to other SDKs than macOS like iOS, tvOS, or watchOS.

This variable is ignored on platforms other than Apple.

Specify the location or name of the macOS platform SDK to be used. CMake uses this value to compute the value of the -isysroot flag or equivalent and to help the find_* commands locate files in the SDK.

If not set explicitly the value is initialized by the SDKROOT environment variable, if set, and otherwise computed based on the CMAKE_OSX_DEPLOYMENT_TARGET or the host platform.

The value of this variable should be set prior to the first project() or enable_language() command invocation because it may influence configuration of the toolchain and flags. It is intended to be set locally by the user creating a build tree. This variable should be set as a CACHE entry (or else CMake may remove it while initializing a cache entry of the same name).

Despite the OSX part in the variable name(s) they apply also to other SDKs than macOS like iOS, tvOS, or watchOS.

This variable is ignored on platforms other than Apple.

New in version 3.18.

This variable is used to initialize the PCH_WARN_INVALID property of targets when they are created.

New in version 3.19.

This variable is used to initialize the PCH_INSTANTIATE_TEMPLATES property of targets when they are created.

Output directory for MS debug symbol .pdb files generated by the linker for executable and shared library targets.

This variable is used to initialize the PDB_OUTPUT_DIRECTORY property on all the targets. See that target property for additional information.

Per-configuration output directory for MS debug symbol .pdb files generated by the linker for executable and shared library targets.

This is a per-configuration version of CMAKE_PDB_OUTPUT_DIRECTORY. This variable is used to initialize the PDB_OUTPUT_DIRECTORY_<CONFIG> property on all the targets. See that target property for additional information.

Default value for POSITION_INDEPENDENT_CODE of targets.

This variable is used to initialize the POSITION_INDEPENDENT_CODE property on all the targets. See that target property for additional information. If set, its value is also used by the try_compile() command.

Where to put all the RUNTIME target files when built.

This variable is used to initialize the RUNTIME_OUTPUT_DIRECTORY property on all the targets. See that target property for additional information.

New in version 3.3.

Where to put all the RUNTIME target files when built for a specific configuration.

This variable is used to initialize the RUNTIME_OUTPUT_DIRECTORY_<CONFIG> property on all the targets. See that target property for additional information.

Linker flags to be used to create shared libraries.

These flags will be used by the linker when creating a shared library.

Flags to be used when linking a shared library.

Same as CMAKE_C_FLAGS_* but used by the linker when creating shared libraries.

New in version 3.7.

Value used to initialize the CMAKE_SHARED_LINKER_FLAGS_<CONFIG> cache entry the first time a build tree is configured. This variable is meant to be set by a toolchain file. CMake may prepend or append content to the value based on the environment and target platform.

See also CMAKE_SHARED_LINKER_FLAGS_INIT.

New in version 3.7.

Value used to initialize the CMAKE_SHARED_LINKER_FLAGS cache entry the first time a build tree is configured. This variable is meant to be set by a toolchain file. CMake may prepend or append content to the value based on the environment and target platform.

See also the configuration-specific variable CMAKE_SHARED_LINKER_FLAGS_<CONFIG>_INIT.

Do not include RPATHs in the build tree.

Normally CMake uses the build tree for the RPATH when building executables etc on systems that use RPATH. When the software is installed the executables etc are relinked by CMake to have the install RPATH. If this variable is set to true then the software is always built with no RPATH.

Do not include RPATHs in the install tree.

Normally CMake uses the build tree for the RPATH when building executables etc on systems that use RPATH. When the software is installed the executables etc are relinked by CMake to have the install RPATH. If this variable is set to true then the software is always installed without RPATH, even if RPATH is enabled when building. This can be useful for example to allow running tests from the build directory with RPATH enabled before the installation step. To omit RPATH in both the build and install steps, use CMAKE_SKIP_RPATH instead.

Flags to be used to create static libraries. These flags will be passed to the archiver when creating a static library.

See also CMAKE_STATIC_LINKER_FLAGS_<CONFIG>.

NOTE:

Static libraries do not actually link. They are essentially archives of object files. The use of the name "linker" in the name of this variable is kept for compatibility.

Flags to be used to create static libraries. These flags will be passed to the archiver when creating a static library in the <CONFIG> configuration.

See also CMAKE_STATIC_LINKER_FLAGS.

NOTE:

Static libraries do not actually link. They are essentially archives of object files. The use of the name "linker" in the name of this variable is kept for compatibility.

New in version 3.7.

Value used to initialize the CMAKE_STATIC_LINKER_FLAGS_<CONFIG> cache entry the first time a build tree is configured. This variable is meant to be set by a toolchain file. CMake may prepend or append content to the value based on the environment and target platform.

See also CMAKE_STATIC_LINKER_FLAGS_INIT.

New in version 3.7.

Value used to initialize the CMAKE_STATIC_LINKER_FLAGS cache entry the first time a build tree is configured. This variable is meant to be set by a toolchain file. CMake may prepend or append content to the value based on the environment and target platform.

See also the configuration-specific variable CMAKE_STATIC_LINKER_FLAGS_<CONFIG>_INIT.

Build configuration used for try_compile() and try_run() projects.

Projects built by try_compile() and try_run() are built synchronously during the CMake configuration step. Therefore a specific build configuration must be chosen even if the generated build system supports multiple configurations.

New in version 3.6.

List of variables that the try_compile() command source file signature must propagate into the test project in order to target the same platform as the host project.

This variable should not be set by project code. It is meant to be set by CMake's platform information modules for the current toolchain, or by a toolchain file when used with CMAKE_TOOLCHAIN_FILE.

Variables meaningful to CMake, such as CMAKE_<LANG>_FLAGS, are propagated automatically. The CMAKE_TRY_COMPILE_PLATFORM_VARIABLES variable may be set to pass custom variables meaningful to a toolchain file. For example, a toolchain file may contain:

set(CMAKE_SYSTEM_NAME ...)
set(CMAKE_TRY_COMPILE_PLATFORM_VARIABLES MY_CUSTOM_VARIABLE)
# ... use MY_CUSTOM_VARIABLE ...

If a user passes -DMY_CUSTOM_VARIABLE=SomeValue to CMake then this setting will be made visible to the toolchain file both for the main project and for test projects generated by the try_compile() command source file signature.

New in version 3.6.

Type of target generated for try_compile() calls using the source file signature. Valid values are:

EXECUTABLE
Use add_executable() to name the source file in the generated project. This is the default if no value is given.
STATIC_LIBRARY
Use add_library() with the STATIC option to name the source file in the generated project. This avoids running the linker and is intended for use with cross-compiling toolchains that cannot link without custom flags or linker scripts.

New in version 3.16.

This variable is used to initialize the UNITY_BUILD property of targets when they are created. Setting it to true enables batch compilation of multiple sources within each target. This feature is known as a Unity or Jumbo build.

Projects should not set this variable, it is intended as a developer control to be set on the cmake(1) command line or other equivalent methods. The developer must have the ability to enable or disable unity builds according to the capabilities of their own machine and compiler.

By default, this variable is not set, which will result in unity builds being disabled.

NOTE:

This option currently does not work well in combination with the CMAKE_EXPORT_COMPILE_COMMANDS variable.

New in version 3.16.

This variable is used to initialize the UNITY_BUILD_BATCH_SIZE property of targets when they are created. It specifies the default upper limit on the number of source files that may be combined in any one unity source file when unity builds are enabled for a target.

New in version 3.20.

This variable is used to initialize the UNITY_BUILD_UNIQUE_ID property of targets when they are created. It specifies the name of the unique identifier generated per file in a unity build.

This variable has no effect. The partially implemented effect it had in previous releases was removed in CMake 3.4.

Default value for the VISIBILITY_INLINES_HIDDEN target property when a target is created.

New in version 3.13.

List of Key=Value records to be set per target as target properties VS_GLOBAL_<variable> with variable=Key and value Value.

For example:

set(CMAKE_VS_GLOBALS
  "DefaultLanguage=en-US"
  "MinimumVisualStudioVersion=14.0"
  )

will set properties VS_GLOBAL_DefaultLanguage to en-US and VS_GLOBAL_MinimumVisualStudioVersion to 14.0 for all targets (except for INTERFACE libraries).

This variable is meant to be set by a toolchain file.

New in version 3.3.

Include INSTALL target to default build.

In Visual Studio solution, by default the INSTALL target will not be part of the default build. Setting this variable will enable the INSTALL target to be part of the default build.

New in version 3.8.

Include PACKAGE target to default build.

In Visual Studio solution, by default the PACKAGE target will not be part of the default build. Setting this variable will enable the PACKAGE target to be part of the default build.

New in version 3.15.

Enable Just My Code with Visual Studio debugger.

This variable is used to initialize the VS_JUST_MY_CODE_DEBUGGING property on all targets when they are created. See that target property for additional information.

New in version 3.12.

This variable allows to override Visual Studio default Exclude Directories.

New in version 3.12.

This variable allows to override Visual Studio default Executable Directories.

New in version 3.12.

This variable allows to override Visual Studio default Include Directories.

New in version 3.12.

This variable allows to override Visual Studio default Library Directories.

New in version 3.12.

This variable allows to override Visual Studio default Library WinRT Directories.

New in version 3.12.

This variable allows to override Visual Studio default Reference Directories.

New in version 3.12.

This variable allows to override Visual Studio default Source Directories.

New in version 3.13.

Inform Visual Studio Generators for VS 2010 and above that the target platform enables WinRT compilation by default and it needs to be explicitly disabled if /ZW or VS_WINRT_COMPONENT is omitted (as opposed to enabling it when either of those options is present)

This makes cmake configuration consistent in terms of WinRT among platforms - if you did not enable the WinRT compilation explicitly, it will be disabled (by either not enabling it or explicitly disabling it)

Note: WinRT compilation is always explicitly disabled for C language source files, even if it is expliclty enabled for a project

This variable is meant to be set by a toolchain file for such platforms.

Default value for WIN32_EXECUTABLE of targets.

This variable is used to initialize the WIN32_EXECUTABLE property on all the targets. See that target property for additional information.

New in version 3.4.

Default value for WINDOWS_EXPORT_ALL_SYMBOLS target property. This variable is used to initialize the property on each target as it is created.

New in version 3.1.

Set Xcode target attributes directly.

Tell the Xcode generator to set <an-attribute> to a given value in the generated Xcode project. Ignored on other generators.

This offers low-level control over the generated Xcode project file. It is meant as a last resort for specifying settings that CMake does not otherwise have a way to control. Although this can override a setting CMake normally produces on its own, doing so bypasses CMake's model of the project and can break things.

See the XCODE_ATTRIBUTE_<an-attribute> target property to set attributes on a specific target.

Contents of CMAKE_XCODE_ATTRIBUTE_<an-attribute> may use "generator expressions" with the syntax $<...>. See the cmake-generator-expressions(7) manual for available expressions. See the cmake-buildsystem(7) manual for more on defining buildsystem properties.

Old executable location variable.

The target property RUNTIME_OUTPUT_DIRECTORY supersedes this variable for a target if it is set. Executable targets are otherwise placed in this directory.

Old library location variable.

The target properties ARCHIVE_OUTPUT_DIRECTORY, LIBRARY_OUTPUT_DIRECTORY, and RUNTIME_OUTPUT_DIRECTORY supersede this variable for a target if they are set. Library targets are otherwise placed in this directory.

New in version 3.7.

True if the C compiler is GNU. Use CMAKE_C_COMPILER_ID instead.

New in version 3.7.

True if the C++ (CXX) compiler is GNU. Use CMAKE_CXX_COMPILER_ID instead.

New in version 3.7.

True if the Fortran compiler is GNU. Use CMAKE_Fortran_COMPILER_ID instead.

New in version 3.18.

Default value for CUDA_ARCHITECTURES property of targets.

Initialized by the CUDAARCHS environment variable if set. Otherwise as follows depending on CMAKE_CUDA_COMPILER_ID:

  • For Clang: the oldest architecture that works.
  • For NVIDIA: the default architecture chosen by the compiler. See policy CMP0104.

Users are encouraged to override this, as the default varies across compilers and compiler versions.

This variable is used to initialize the CUDA_ARCHITECTURES property on all targets. See the target property for additional information.

cmake_minimum_required(VERSION)
if(NOT DEFINED CMAKE_CUDA_ARCHITECTURES)
  set(CMAKE_CUDA_ARCHITECTURES 75)
endif()
project(example LANGUAGES CUDA)

CMAKE_CUDA_ARCHITECTURES will default to 75 unless overridden by the user.

New in version 3.17.

List of features known to the CUDA compiler

These features are known to be available for use with the CUDA compiler. This list is a subset of the features listed in the CMAKE_CUDA_KNOWN_FEATURES global property.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

New in version 3.8.

Default value for CUDA_EXTENSIONS property of targets.

This variable is used to initialize the CUDA_EXTENSIONS property on all targets. See that target property for additional information.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

New in version 3.10.

When CMAKE_CUDA_COMPILER_ID is NVIDIA, CMAKE_CUDA_HOST_COMPILER selects the compiler executable to use when compiling host code for CUDA language files. This maps to the nvcc -ccbin option.

The CMAKE_CUDA_HOST_COMPILER variable may be set explicitly before CUDA is first enabled by a project() or enable_language() command. This can be done via -DCMAKE_CUDA_HOST_COMPILER=... on the command line or in a toolchain file. Or, one may set the CUDAHOSTCXX environment variable to provide a default value.

Once the CUDA language is enabled, the CMAKE_CUDA_HOST_COMPILER variable is read-only and changes to it are undefined behavior.

NOTE:

Since CMAKE_CUDA_HOST_COMPILER is meaningful only when the CMAKE_CUDA_COMPILER_ID is NVIDIA, it does not make sense to set CMAKE_CUDA_HOST_COMPILER without also setting CMAKE_CUDA_COMPILER to NVCC.

NOTE:

Ignored when using Visual Studio Generators.

New in version 3.8.

Default value for CUDA_STANDARD property of targets.

This variable is used to initialize the CUDA_STANDARD property on all targets. See that target property for additional information.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

New in version 3.8.

Default value for CUDA_STANDARD_REQUIRED property of targets.

This variable is used to initialize the CUDA_STANDARD_REQUIRED property on all targets. See that target property for additional information.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

New in version 3.8.

When the CUDA language has been enabled, this provides a semicolon-separated list of include directories provided by the CUDA Toolkit. The value may be useful for C++ source files to include CUDA headers.

New in version 3.1.

List of features known to the C++ compiler

These features are known to be available for use with the C++ compiler. This list is a subset of the features listed in the CMAKE_CXX_KNOWN_FEATURES global property.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

New in version 3.1.

Default value for CXX_EXTENSIONS property of targets.

This variable is used to initialize the CXX_EXTENSIONS property on all targets. See that target property for additional information.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

New in version 3.1.

Default value for CXX_STANDARD property of targets.

This variable is used to initialize the CXX_STANDARD property on all targets. See that target property for additional information.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

New in version 3.1.

Default value for CXX_STANDARD_REQUIRED property of targets.

This variable is used to initialize the CXX_STANDARD_REQUIRED property on all targets. See that target property for additional information.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

New in version 3.1.

List of features known to the C compiler

These features are known to be available for use with the C compiler. This list is a subset of the features listed in the CMAKE_C_KNOWN_FEATURES global property.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

New in version 3.1.

Default value for C_EXTENSIONS property of targets.

This variable is used to initialize the C_EXTENSIONS property on all targets. See that target property for additional information.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

New in version 3.1.

Default value for C_STANDARD property of targets.

This variable is used to initialize the C_STANDARD property on all targets. See that target property for additional information.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

New in version 3.1.

Default value for C_STANDARD_REQUIRED property of targets.

This variable is used to initialize the C_STANDARD_REQUIRED property on all targets. See that target property for additional information.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

Fortran default module output directory.

Most Fortran compilers write .mod files to the current working directory. For those that do not, this is set to . and used when the Fortran_MODULE_DIRECTORY target property is not set.

Fortran flag for module output directory.

This stores the flag needed to pass the value of the Fortran_MODULE_DIRECTORY target property to the compiler.

Fortran flag to enable module output.

Most Fortran compilers write .mod files out by default. For others, this stores the flag needed to enable module output.

New in version 3.21.

Default value for HIP_ARCHITECTURES property of targets.

This is initialized to the architectures reported by rocm_agent_enumerator, if available, and otherwise to the default chosen by the compiler.

This variable is used to initialize the HIP_ARCHITECTURES property on all targets. See the target property for additional information.

New in version 3.19.

ISPC generated header output directory.

This variable is used to initialize the ISPC_HEADER_DIRECTORY property on all the targets. See the target property for additional information.

New in version 3.19.2.

Output suffix to be used for ISPC generated headers.

This variable is used to initialize the ISPC_HEADER_SUFFIX property on all the targets. See the target property for additional information.

New in version 3.19.

Default value for ISPC_INSTRUCTION_SETS property of targets.

This variable is used to initialize the ISPC_INSTRUCTION_SETS property on all targets. See the target property for additional information.

New in version 3.7.1.

When Cross Compiling for Android this variable contains the toolchain binutils machine name (e.g. gcc -dumpmachine). The binutils typically have a <machine>- prefix on their name.

See also CMAKE_<LANG>_ANDROID_TOOLCHAIN_PREFIX and CMAKE_<LANG>_ANDROID_TOOLCHAIN_SUFFIX.

New in version 3.7.

When Cross Compiling for Android this variable contains the absolute path prefixing the toolchain GNU compiler and its binutils.

See also CMAKE_<LANG>_ANDROID_TOOLCHAIN_SUFFIX and CMAKE_<LANG>_ANDROID_TOOLCHAIN_MACHINE.

For example, the path to the linker is:

${CMAKE_CXX_ANDROID_TOOLCHAIN_PREFIX}ld${CMAKE_CXX_ANDROID_TOOLCHAIN_SUFFIX}

New in version 3.7.

When Cross Compiling for Android this variable contains the host platform suffix of the toolchain GNU compiler and its binutils.

See also CMAKE_<LANG>_ANDROID_TOOLCHAIN_PREFIX and CMAKE_<LANG>_ANDROID_TOOLCHAIN_MACHINE.

Rule variable to append to a static archive.

This is a rule variable that tells CMake how to append to a static archive. It is used in place of CMAKE_<LANG>_CREATE_STATIC_LIBRARY on some platforms in order to support large object counts. See also CMAKE_<LANG>_ARCHIVE_CREATE and CMAKE_<LANG>_ARCHIVE_FINISH.

Rule variable to create a new static archive.

This is a rule variable that tells CMake how to create a static archive. It is used in place of CMAKE_<LANG>_CREATE_STATIC_LIBRARY on some platforms in order to support large object counts. See also CMAKE_<LANG>_ARCHIVE_APPEND and CMAKE_<LANG>_ARCHIVE_FINISH.

Rule variable to finish an existing static archive.

This is a rule variable that tells CMake how to finish a static archive. It is used in place of CMAKE_<LANG>_CREATE_STATIC_LIBRARY on some platforms in order to support large object counts. See also CMAKE_<LANG>_ARCHIVE_CREATE and CMAKE_<LANG>_ARCHIVE_APPEND.

New in version 3.20.

Byte order of <LANG> compiler target architecture, if known. If defined and not empty, the value is one of:

BIG_ENDIAN
The target architecture is Big Endian.
LITTLE_ENDIAN
The target architecture is Little Endian.

This is defined for languages C, CXX, OBJC, OBJCXX, and CUDA.

If CMAKE_OSX_ARCHITECTURES specifies multiple architectures, the value of CMAKE_<LANG>_BYTE_ORDER is non-empty only if all architectures share the same byte order.

The full path to the compiler for LANG.

This is the command that will be used as the <LANG> compiler. Once set, you can not change this variable.

This variable can be set by the user during the first time a build tree is configured.

If a non-full path value is supplied then CMake will resolve the full path of the compiler.

The variable could be set in a user supplied toolchain file or via -D on the command line.

NOTE:

Options that are required to make the compiler work correctly can be included as items in a list; they can not be changed.
#set within user supplied toolchain file
set(CMAKE_C_COMPILER /full/path/to/qcc --arg1 --arg2)

or

$ cmake ... -DCMAKE_C_COMPILER='qcc;--arg1;--arg2'

The external toolchain for cross-compiling, if supported.

Some compiler toolchains do not ship their own auxiliary utilities such as archivers and linkers. The compiler driver may support a command-line argument to specify the location of such tools. CMAKE_<LANG>_COMPILER_EXTERNAL_TOOLCHAIN may be set to a path to the external toolchain and will be passed to the compiler driver if supported.

This variable may only be set in a toolchain file specified by the CMAKE_TOOLCHAIN_FILE variable.

Compiler identification string.

A short string unique to the compiler vendor. Possible values include:

Absoft = Absoft Fortran (absoft.com)
ADSP = Analog VisualDSP++ (analog.com)
AppleClang = Apple Clang (apple.com)
ARMCC = ARM Compiler (arm.com)
ARMClang = ARM Compiler based on Clang (arm.com)
Bruce = Bruce C Compiler
CCur = Concurrent Fortran (ccur.com)
Clang = LLVM Clang (clang.llvm.org)
Cray = Cray Compiler (cray.com)
Embarcadero, Borland = Embarcadero (embarcadero.com)
Flang = Flang LLVM Fortran Compiler
Fujitsu = Fujitsu HPC compiler (Trad mode)
FujitsuClang = Fujitsu HPC compiler (Clang mode)
G95 = G95 Fortran (g95.org)
GNU = GNU Compiler Collection (gcc.gnu.org)
GHS = Green Hills Software (www.ghs.com)
HP = Hewlett-Packard Compiler (hp.com)
IAR = IAR Systems (iar.com)
Intel = Intel Compiler (intel.com)
IntelLLVM = Intel LLVM-Based Compiler (intel.com)
MSVC = Microsoft Visual Studio (microsoft.com)
NVHPC = NVIDIA HPC SDK Compiler (nvidia.com)
NVIDIA = NVIDIA CUDA Compiler (nvidia.com)
OpenWatcom = Open Watcom (openwatcom.org)
PGI = The Portland Group (pgroup.com)
PathScale = PathScale (pathscale.com)
SDCC = Small Device C Compiler (sdcc.sourceforge.net)
SunPro = Oracle Solaris Studio (oracle.com)
TI = Texas Instruments (ti.com)
TinyCC = Tiny C Compiler (tinycc.org)
XL, VisualAge, zOS = IBM XL (ibm.com)
XLClang = IBM Clang-based XL (ibm.com)

This variable is not guaranteed to be defined for all compilers or languages.

Defined to true if the language is enabled.

When language <LANG> is enabled by project() or enable_language() this variable is defined to 1.

New in version 3.10.

Command that outputs the compiler pre definitions.

See AUTOMOC which uses CMAKE_CXX_COMPILER_PREDEFINES_COMMAND to generate the AUTOMOC_COMPILER_PREDEFINES.

The target for cross-compiling, if supported.

Some compiler drivers are inherently cross-compilers, such as clang and QNX qcc. These compiler drivers support a command-line argument to specify the target to cross-compile for.

This variable may only be set in a toolchain file specified by the CMAKE_TOOLCHAIN_FILE variable.

Compiler version string.

Compiler version in major[.minor[.patch[.tweak]]] format. This variable is not guaranteed to be defined for all compilers or languages.

For example CMAKE_C_COMPILER_VERSION and CMAKE_CXX_COMPILER_VERSION might indicate the respective C and C++ compiler version.

Rule variable to compile a single object file.

This is a rule variable that tells CMake how to compile a single object file for the language <LANG>.

Rule variable to create a shared library.

This is a rule variable that tells CMake how to create a shared library for the language <LANG>. This rule variable is a ; delimited list of commands to run to perform the linking step.

Rule variable to create a shared module.

This is a rule variable that tells CMake how to create a shared library for the language <LANG>. This rule variable is a ; delimited list of commands to run.

Rule variable to create a static library.

This is a rule variable that tells CMake how to create a static library for the language <LANG>.

Flags for all build types.

<LANG> flags used regardless of the value of CMAKE_BUILD_TYPE.

This is initialized for each language from environment variables:

  • CMAKE_C_FLAGS: Initialized by the CFLAGS environment variable.
  • CMAKE_CXX_FLAGS: Initialized by the CXXFLAGS environment variable.
  • CMAKE_CUDA_FLAGS: Initialized by the CUDAFLAGS environment variable.
  • CMAKE_Fortran_FLAGS: Initialized by the FFLAGS environment variable.

This value is a command-line string fragment. Therefore, multiple options should be separated by spaces, and options with spaces should be quoted.

The flags in this variable will be passed to the compiler before those in the per-configuration CMAKE_<LANG>_FLAGS_<CONFIG> variant, and before flags added by the add_compile_options() or target_compile_options() commands.

Flags for language <LANG> when building for the <CONFIG> configuration.

The flags in this variable will be passed to the compiler after those in the CMAKE_<LANG>_FLAGS variable, but before flags added by the add_compile_options() or target_compile_options() commands.

New in version 3.11.

Value used to initialize the CMAKE_<LANG>_FLAGS_<CONFIG> cache entry the first time a build tree is configured for language <LANG>. This variable is meant to be set by a toolchain file. CMake may prepend or append content to the value based on the environment and target platform.

See also CMAKE_<LANG>_FLAGS_INIT.

This variable is the Debug variant of the CMAKE_<LANG>_FLAGS_<CONFIG> variable.

New in version 3.7.

This variable is the Debug variant of the CMAKE_<LANG>_FLAGS_<CONFIG>_INIT variable.

New in version 3.7.

Value used to initialize the CMAKE_<LANG>_FLAGS cache entry the first time a build tree is configured for language <LANG>. This variable is meant to be set by a toolchain file. CMake may prepend or append content to the value based on the environment and target platform. For example, the contents of a xxxFLAGS environment variable will be prepended, where xxx will be language-specific but not necessarily the same as <LANG> (e.g. CXXFLAGS for CXX, FFLAGS for Fortran, and so on). This value is a command-line string fragment. Therefore, multiple options should be separated by spaces, and options with spaces should be quoted.

See also the configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG>_INIT variable.

This variable is the MinSizeRel variant of the CMAKE_<LANG>_FLAGS_<CONFIG> variable.

New in version 3.7.

This variable is the MinSizeRel variant of the CMAKE_<LANG>_FLAGS_<CONFIG>_INIT variable.

This variable is the Release variant of the CMAKE_<LANG>_FLAGS_<CONFIG> variable.

New in version 3.7.

This variable is the Release variant of the CMAKE_<LANG>_FLAGS_<CONFIG>_INIT variable.

This variable is the RelWithDebInfo variant of the CMAKE_<LANG>_FLAGS_<CONFIG> variable.

New in version 3.7.

This variable is the RelWithDebInfo variant of the CMAKE_<LANG>_FLAGS_<CONFIG>_INIT variable.

File extensions that should be ignored by the build.

This is a list of file extensions that may be part of a project for a given language but are not compiled.

Directories implicitly searched by the compiler for header files.

CMake does not explicitly specify these directories on compiler command lines for language <LANG>. This prevents system include directories from being treated as user include directories on some compilers, which is important for C, CXX, and CUDA to avoid overriding standard library headers.

This value is not used for Fortran because it has no standard library headers and some compilers do not search their implicit include directories for module .mod files.

Implicit linker search path detected for language <LANG>.

Compilers typically pass directories containing language runtime libraries and default library search paths when they invoke a linker. These paths are implicit linker search directories for the compiler's language. CMake automatically detects these directories for each language and reports the results in this variable.

Some toolchains read implicit directories from an environment variable such as LIBRARY_PATH. If using such an environment variable, keep its value consistent when operating in a given build tree because CMake saves the value detected when first creating a build tree.

If policy CMP0060 is not set to NEW, then when a library in one of these directories is given by full path to target_link_libraries() CMake will generate the -l<name> form on link lines for historical purposes.

Implicit linker framework search path detected for language <LANG>.

These paths are implicit linker framework search directories for the compiler's language. CMake automatically detects these directories for each language and reports the results in this variable.

Implicit link libraries and flags detected for language <LANG>.

Compilers typically pass language runtime library names and other flags when they invoke a linker. These flags are implicit link options for the compiler's language. CMake automatically detects these libraries and flags for each language and reports the results in this variable.

Target architecture library directory name detected for <LANG>.

If the <LANG> compiler passes to the linker an architecture-specific system library search directory such as <prefix>/lib/<arch> this variable contains the <arch> name if/as detected by CMake.

Rule variable to link an executable.

Rule variable to link an executable for the given language.

Preference value for linker language selection.

The "linker language" for executable, shared library, and module targets is the language whose compiler will invoke the linker. The LINKER_LANGUAGE target property sets the language explicitly. Otherwise, the linker language is that whose linker preference value is highest among languages compiled and linked into the target. See also the CMAKE_<LANG>_LINKER_PREFERENCE_PROPAGATES variable.

True if CMAKE_<LANG>_LINKER_PREFERENCE propagates across targets.

This is used when CMake selects a linker language for a target. Languages compiled directly into the target are always considered. A language compiled into static libraries linked by the target is considered if this variable is true.

New in version 3.13.

Defines the syntax of compiler driver option to pass options to the linker tool. It will be used to translate the LINKER: prefix in the link options (see add_link_options() and target_link_options()).

This variable holds a semicolon-separated list of tokens. If a space (i.e. " ") is specified as last token, flag and LINKER: arguments will be specified as separate arguments to the compiler driver. The CMAKE_<LANG>_LINKER_WRAPPER_FLAG_SEP variable can be specified to manage concatenation of arguments.

For example, for Clang we have:

set (CMAKE_C_LINKER_WRAPPER_FLAG "-Xlinker" " ")

Specifying "LINKER:-z,defs" will be transformed in -Xlinker -z -Xlinker defs.

For GNU GCC:

set (CMAKE_C_LINKER_WRAPPER_FLAG "-Wl,")
set (CMAKE_C_LINKER_WRAPPER_FLAG_SEP ",")

Specifying "LINKER:-z,defs" will be transformed in -Wl,-z,defs.

And for SunPro:

set (CMAKE_C_LINKER_WRAPPER_FLAG "-Qoption" "ld" " ")
set (CMAKE_C_LINKER_WRAPPER_FLAG_SEP ",")

Specifying "LINKER:-z,defs" will be transformed in -Qoption ld -z,defs.

New in version 3.13.

This variable is used with CMAKE_<LANG>_LINKER_WRAPPER_FLAG variable to format LINKER: prefix in the link options (see add_link_options() and target_link_options()).

When specified, arguments of the LINKER: prefix will be concatenated using this value as separator.

Extension for the output of a compile for a single file.

This is the extension for an object file for the given <LANG>. For example .obj for C on Windows.

Identification string of "simulated" compiler.

Some compilers simulate other compilers to serve as drop-in replacements. When CMake detects such a compiler it sets this variable to what would have been the CMAKE_<LANG>_COMPILER_ID for the simulated compiler.

Version string of "simulated" compiler.

Some compilers simulate other compilers to serve as drop-in replacements. When CMake detects such a compiler it sets this variable to what would have been the CMAKE_<LANG>_COMPILER_VERSION for the simulated compiler.

Size of pointer-to-data types for language <LANG>.

This holds the size (in bytes) of pointer-to-data types in the target platform ABI. It is defined for languages C and CXX (C++).

Extensions of source files for the given language.

This is the list of extensions for a given language's source files.

New in version 3.6.

Include directories to be used for every source file compiled with the <LANG> compiler. This is meant for specification of system include directories needed by the language for the current platform. The directories always appear at the end of the include path passed to the compiler.

This variable should not be set by project code. It is meant to be set by CMake's platform information modules for the current toolchain, or by a toolchain file when used with CMAKE_TOOLCHAIN_FILE.

See also CMAKE_<LANG>_STANDARD_LIBRARIES.

New in version 3.6.

Libraries linked into every executable and shared library linked for language <LANG>. This is meant for specification of system libraries needed by the language for the current platform.

This variable should not be set by project code. It is meant to be set by CMake's platform information modules for the current toolchain, or by a toolchain file when used with CMAKE_TOOLCHAIN_FILE.

See also CMAKE_<LANG>_STANDARD_INCLUDE_DIRECTORIES.

New in version 3.16.

Default value for OBJC_EXTENSIONS property of targets.

This variable is used to initialize the OBJC_EXTENSIONS property on all targets. See that target property for additional information.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

New in version 3.16.

Default value for OBJC_STANDARD property of targets.

This variable is used to initialize the OBJC_STANDARD property on all targets. See that target property for additional information.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

New in version 3.16.

Default value for OBJC_STANDARD_REQUIRED property of targets.

This variable is used to initialize the OBJC_STANDARD_REQUIRED property on all targets. See that target property for additional information.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

New in version 3.16.

Default value for OBJCXX_EXTENSIONS property of targets.

This variable is used to initialize the OBJCXX_EXTENSIONS property on all targets. See that target property for additional information.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

New in version 3.16.

Default value for OBJCXX_STANDARD property of targets.

This variable is used to initialize the OBJCXX_STANDARD property on all targets. See that target property for additional information.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

New in version 3.16.

Default value for OBJCXX_STANDARD_REQUIRED property of targets.

This variable is used to initialize the OBJCXX_STANDARD_REQUIRED property on all targets. See that target property for additional information.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

New in version 3.7.

Set to the Swift language version number. If not set, the oldest legacy version known to be available in the host Xcode version is assumed:

  • Swift 4.0 for Xcode 10.2 and above.
  • Swift 3.0 for Xcode 8.3 and above.
  • Swift 2.3 for Xcode 8.2 and below.

Specify a CMake file that overrides platform information for <LANG>.

This is a language-specific version of CMAKE_USER_MAKE_RULES_OVERRIDE loaded only when enabling language <LANG>.

New in version 3.1.

Specify the CTest BuildDirectory setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest MakeCommand setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest BuildName setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest BZRCommand setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest BZRUpdateOptions setting in a ctest(1) dashboard client script.

New in version 3.4.

Specify the CTest ChangeId setting in a ctest(1) dashboard client script.

This setting allows CTest to pass arbitrary information about this build up to CDash. One use of this feature is to allow CDash to post comments on your pull request if anything goes wrong with your build.

New in version 3.1.

Tell the ctest_start() command how to checkout or initialize the source directory in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest DefaultCTestConfigurationType setting in a ctest(1) dashboard client script.

If the configuration type is set via -C <cfg> from the command line then this variable is populated accordingly.

New in version 3.1.

Specify the CTest ConfigureCommand setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest CoverageCommand setting in a ctest(1) dashboard client script.

Using Cobertura as the coverage generation within your multi-module Java project can generate a series of XML files.

The Cobertura Coverage parser expects to read the coverage data from a single XML file which contains the coverage data for all modules. Cobertura has a program with the ability to merge given cobertura.ser files and then another program to generate a combined XML file from the previous merged file. For command line testing, this can be done by hand prior to CTest looking for the coverage files. For script builds, set the CTEST_COVERAGE_COMMAND variable to point to a file which will perform these same steps, such as a .sh or .bat file.

set(CTEST_COVERAGE_COMMAND .../run-coverage-and-consolidate.sh)

where the run-coverage-and-consolidate.sh script is perhaps created by the configure_file() command and might contain the following code:

#!/usr/bin/env bash
CoberturaFiles="$(find "/path/to/source" -name "cobertura.ser")"
SourceDirs="$(find "/path/to/source" -name "java" -type d)"
cobertura-merge --datafile coberturamerge.ser $CoberturaFiles
cobertura-report --datafile coberturamerge.ser --destination . \
                 --format xml $SourceDirs

The script uses find to capture the paths to all of the cobertura.ser files found below the project's source directory. It keeps the list of files and supplies it as an argument to the cobertura-merge program. The --datafile argument signifies where the result of the merge will be kept.

The combined coberturamerge.ser file is then used to generate the XML report using the cobertura-report program. The call to the cobertura-report program requires some named arguments.

--datafila
path to the merged .ser file
--destination
path to put the output files(s)
--format
file format to write output in: xml or html

The rest of the supplied arguments consist of the full paths to the /src/main/java directories of each module within the source tree. These directories are needed and should not be forgotten.

New in version 3.1.

Specify the CTest CoverageExtraFlags setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest CurlOptions setting in a ctest(1) dashboard client script.

A list of regular expressions which will be used to exclude files by their path from coverage output by the ctest_coverage() command.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

A list of regular expressions which will be used to exclude when detecting error messages in build outputs by the ctest_test() command.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

A list of regular expressions which will be used to detect error messages in build outputs by the ctest_test() command.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

The number of lines to include as context which follow an error message by the ctest_test() command. The default is 10.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

The number of lines to include as context which precede an error message by the ctest_test() command. The default is 10.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

When saving a failing test's output, this is the maximum size, in bytes, that will be collected by the ctest_test() command. Defaults to 307200 (300 KiB).

If a test's output contains the literal string "CTEST_FULL_OUTPUT", the output will not be truncated and may exceed the maximum size.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

For controlling the output collection of passing tests, see CTEST_CUSTOM_MAXIMUM_PASSED_TEST_OUTPUT_SIZE.

The maximum number of errors in a single build step which will be detected. After this, the ctest_test() command will truncate the output. Defaults to 50.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

The maximum number of warnings in a single build step which will be detected. After this, the ctest_test() command will truncate the output. Defaults to 50.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

When saving a passing test's output, this is the maximum size, in bytes, that will be collected by the ctest_test() command. Defaults to 1024 (1 KiB).

If a test's output contains the literal string "CTEST_FULL_OUTPUT", the output will not be truncated and may exceed the maximum size.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

For controlling the output collection of failing tests, see CTEST_CUSTOM_MAXIMUM_FAILED_TEST_OUTPUT_SIZE.

A list of regular expressions to use to exclude tests during the ctest_memcheck() command.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

A list of commands to run at the end of the ctest_memcheck() command.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

A list of commands to run at the end of the ctest_test() command.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

A list of commands to run at the start of the ctest_memcheck() command.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

A list of commands to run at the start of the ctest_test() command.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

A list of regular expressions to use to exclude tests during the ctest_test() command.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

A list of regular expressions which will be used to exclude when detecting warning messages in build outputs by the ctest_build() command.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

A list of regular expressions which will be used to detect warning messages in build outputs by the ctest_build() command.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

New in version 3.1.

Deprecated. Use CTEST_CHECKOUT_COMMAND instead.

New in version 3.1.

Specify the CTest CVSCommand setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest CVSUpdateOptions setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest DropLocation setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest DropMethod setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest DropSite setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest IsCDash setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest DropSitePassword setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest DropSiteUser setting in a ctest(1) dashboard client script.

New in version 3.4.

A list of regular expressions which will be used to find files which should be covered by the ctest_coverage() command.

It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.

New in version 3.1.

Specify the CTest GITCommand setting in a ctest(1) dashboard client script.

New in version 3.6.

Specify the CTest GITInitSubmodules setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest GITUpdateCustom setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest GITUpdateOptions setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest HGCommand setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest HGUpdateOptions setting in a ctest(1) dashboard client script.

New in version 3.10.

Specify the CTest LabelsForSubprojects setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest MemoryCheckCommand setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest MemoryCheckCommandOptions setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest MemoryCheckSanitizerOptions setting in a ctest(1) dashboard client script.

CTest prepends correct sanitizer options *_OPTIONS environment variable to executed command. CTests adds its own log_path to sanitizer options, don't provide your own log_path.

New in version 3.1.

Specify the CTest MemoryCheckSuppressionFile setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest MemoryCheckType setting in a ctest(1) dashboard client script. Valid values are Valgrind, Purify, BoundsChecker, DrMemory, CudaSanitizer, ThreadSanitizer, AddressSanitizer, LeakSanitizer, MemorySanitizer and UndefinedBehaviorSanitizer.

New in version 3.1.

Specify the CTest NightlyStartTime setting in a ctest(1) dashboard client script.

Note that this variable must always be set for a nightly build in a dashboard script. It is needed so that nightly builds can be properly grouped together in CDash.

New in version 3.1.

Specify the CTest P4Client setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest P4Command setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest P4Options setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest P4UpdateOptions setting in a ctest(1) dashboard client script.

New in version 3.18.

Specify the CTest ResourceSpecFile setting in a ctest(1) dashboard client script.

This can also be used to specify the resource spec file from a CMake build. If no RESOURCE_SPEC_FILE is passed to ctest_test(), and CTEST_RESOURCE_SPEC_FILE is not specified in the dashboard script, the value of this variable from the build is used.

New in version 3.11.

Setting this to 0 prevents ctest(1) from being run again when it reaches the end of a script run by calling ctest -S.

New in version 3.1.

Legacy option. Not used.

The directory containing the top-level CTest script. The concept is similar to CMAKE_SOURCE_DIR.

New in version 3.1.

Specify the CTest Site setting in a ctest(1) dashboard client script.

New in version 3.14.

Specify the CTest SubmitURL setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest SourceDirectory setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest SVNCommand setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest SVNOptions setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest SVNUpdateOptions setting in a ctest(1) dashboard client script.

New in version 3.4.

Specify the TestLoad setting in the CTest Test Step of a ctest(1) dashboard client script. This sets the default value for the TEST_LOAD option of the ctest_test() command.

New in version 3.1.

Specify the CTest TimeOut setting in a ctest(1) dashboard client script.

New in version 3.1.

Legacy option. Not used.

New in version 3.1.

Specify the CTest UpdateCommand setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest UpdateOptions setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest UpdateVersionOnly setting in a ctest(1) dashboard client script.

New in version 3.15.

Specify the CTest UpdateVersionOverride setting in a ctest(1) dashboard client script.

New in version 3.1.

Specify the CTest UseLaunchers setting in a ctest(1) dashboard client script.

List of files which have been installed using an ABSOLUTE DESTINATION path.

This variable is a Read-Only variable which is set internally by CPack during installation and before packaging using CMAKE_ABSOLUTE_DESTINATION_FILES defined in cmake_install.cmake scripts. The value can be used within CPack project configuration file and/or CPack<GEN>.cmake file of <GEN> generator.

Boolean toggle to include/exclude top level directory (component case).

Similar usage as CPACK_INCLUDE_TOPLEVEL_DIRECTORY but for the component case. See CPACK_INCLUDE_TOPLEVEL_DIRECTORY documentation for the detail.

New in version 3.21.

CPack variables (set via e.g. cpack -D, CPackConfig.cmake or CPACK_PROJECT_CONFIG_FILE scripts) are not directly visible in installation scripts. Instead, one can pass a list of varName=value pairs in the CPACK_CUSTOM_INSTALL_VARIABLES variable. At install time, each list item will result in a variable of the specified name (varName) being set to the given value. The = can be omitted for an empty value.

CPACK_CUSTOM_INSTALL_VARIABLES allows the packaging installation to be influenced by the user or driving script at CPack runtime without having to regenerate the install scripts.

install(FILES large.txt DESTINATION data)
install(CODE [[
  if(ENABLE_COMPRESSION)
    # "run-compressor" is a fictional tool that produces
    # large.txt.xz from large.txt and then removes the input file
    execute_process(COMMAND run-compressor $ENV{DESTDIR}${CMAKE_INSTALL_PREFIX}/large.txt)
  endif()
]])

With the above example snippet, cpack will by default run the installation script with ENABLE_COMPRESSION unset, resulting in a package containing the uncompressed large.txt. This can be overridden when invoking cpack like so:

cpack -D "CPACK_CUSTOM_INSTALL_VARIABLES=ENABLE_COMPRESSION=TRUE"

The installation script will then run with ENABLE_COMPRESSION set to TRUE, resulting in a package containing the compressed large.txt.xz instead.

Ask CPack to error out as soon as a file with absolute INSTALL DESTINATION is encountered.

The fatal error is emitted before the installation of the offending file takes place. Some CPack generators, like NSIS, enforce this internally. This variable triggers the definition of CMAKE_ERROR_ON_ABSOLUTE_INSTALL_DESTINATION when CPack runs.

Boolean toggle to include/exclude top level directory.

When preparing a package CPack installs the item under the so-called top level directory. The purpose of is to include (set to 1 or ON or TRUE) the top level directory in the package or not (set to 0 or OFF or FALSE).

Each CPack generator has a built-in default value for this variable. E.g. Archive generators (ZIP, TGZ, ...) includes the top level whereas RPM or DEB don't. The user may override the default value by setting this variable.

There is a similar variable CPACK_COMPONENT_INCLUDE_TOPLEVEL_DIRECTORY which may be used to override the behavior for the component packaging case which may have different default value for historical (now backward compatibility) reason.

New in version 3.11.

Default permissions for implicitly created directories during packaging.

This variable serves the same purpose during packaging as the CMAKE_INSTALL_DEFAULT_DIRECTORY_PERMISSIONS variable serves during installation (e.g. make install).

If include(CPack) is used then by default this variable is set to the content of CMAKE_INSTALL_DEFAULT_DIRECTORY_PERMISSIONS.

The prefix used in the built package.

Each CPack generator has a default value (like /usr). This default value may be overwritten from the CMakeLists.txt or the cpack(1) command line by setting an alternative value. Example:

set(CPACK_PACKAGING_INSTALL_PREFIX "/opt")

This is not the same purpose as CMAKE_INSTALL_PREFIX which is used when installing from the build tree without building a package.

Boolean toggle to make CPack use DESTDIR mechanism when packaging.

DESTDIR means DESTination DIRectory. It is commonly used by makefile users in order to install software at non-default location. It is a basic relocation mechanism that should not be used on Windows (see CMAKE_INSTALL_PREFIX documentation). It is usually invoked like this:

make DESTDIR=/home/john install

which will install the concerned software using the installation prefix, e.g. /usr/local prepended with the DESTDIR value which finally gives /home/john/usr/local. When preparing a package, CPack first installs the items to be packaged in a local (to the build tree) directory by using the same DESTDIR mechanism. Nevertheless, if CPACK_SET_DESTDIR is set then CPack will set DESTDIR before doing the local install. The most noticeable difference is that without CPACK_SET_DESTDIR, CPack uses CPACK_PACKAGING_INSTALL_PREFIX as a prefix whereas with CPACK_SET_DESTDIR set, CPack will use CMAKE_INSTALL_PREFIX as a prefix.

Manually setting CPACK_SET_DESTDIR may help (or simply be necessary) if some install rules uses absolute DESTINATION (see CMake install() command). However, starting with CPack/CMake 2.8.3 RPM and DEB installers tries to handle DESTDIR automatically so that it is seldom necessary for the user to set it.

Ask CPack to warn each time a file with absolute INSTALL DESTINATION is encountered.

This variable triggers the definition of CMAKE_WARN_ON_ABSOLUTE_INSTALL_DESTINATION when CPack runs cmake_install.cmake scripts.

New in version 3.13.

Operator to read cache variables.

Use the syntax $CACHE{VAR} to read cache entry VAR. See the cmake-language(7) variables documentation for more complete documentation of the interaction of normal variables and cache entries.

When evaluating Variable References of the form ${VAR}, CMake first searches for a normal variable with that name, and if not found CMake will search for a cache entry with that name. The $CACHE{VAR} syntax can be used to do direct cache lookup and ignore any existing normal variable.

See the set() and unset() commands to see how to write or remove cache variables.

Operator to read environment variables.

Use the syntax $ENV{VAR} to read environment variable VAR.

To test whether an environment variable is defined, use the signature if(DEFINED ENV{<name>}) of the if() command.

See the set() and unset() commands to see how to write or remove environment variables.

CMake has many internal variables. Most of them are undocumented. Some of them, however, were at some point described as normal variables, and therefore may be encountered in legacy code. They are subject to change, and not recommended for use in project code.

Path to top of source tree. Same as CMAKE_SOURCE_DIR.

This is an internal cache entry used to locate the source directory when loading a CMakeCache.txt from a build tree. It should not be used in project code. The variable CMAKE_SOURCE_DIR has the same value and should be preferred.

An internal variable subject to change.

This is used in determining the compiler ABI and is subject to change.

An internal variable subject to change.

This is used in determining the compiler ABI and is subject to change.

New in version 3.10.

An internal variable subject to change.

This is used to identify the variant of a compiler based on its target architecture. For some compilers this is needed to determine the correct usage.

New in version 3.10.

An internal variable subject to change.

This is used to identify the variant of a compiler based on an internal version number. For some compilers this is needed to determine the correct usage.

An internal variable subject to change.

This is used in determining the platform and is subject to change.

Skip _BUILD_TYPE flags if true.

This is an internal flag used by the generators in CMake to tell CMake to skip the _BUILD_TYPE flags.

When generating for Visual Studio 9 2008 or greater with the Intel Fortran plugin installed, this specifies the .vfproj project file format version. This is intended for internal use by CMake and should not be used by project code.

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September 20, 2021 3.21.3