CXREF(1P)                  POSIX Programmer's Manual                 CXREF(1P)

PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the corresponding
       Linux manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       cxref -- generate a C-language program cross-reference table
       (DEVELOPMENT)

SYNOPSIS
       cxref [-cs] [-o file] [-w num] [-D name[=def]]... [-I dir]...
           [-U name]... file...

DESCRIPTION
       The cxref utility shall analyze a collection of C-language files and
       attempt to build a cross-reference table. Information from #define
       lines shall be included in the symbol table. A sorted listing shall be
       written to standard output of all symbols (auto, static, and global) in
       each file separately, or with the -c option, in combination. Each
       symbol shall contain an <asterisk> before the declaring reference.

OPTIONS
       The cxref utility shall conform to the Base Definitions volume of
       POSIX.1-2017, Section 12.2, Utility Syntax Guidelines, except that the
       order of the -D, -I, and -U options (which are identical to their
       interpretation by c99) is significant. The following options shall be
       supported:

       -c        Write a combined cross-reference of all input files.

       -s        Operate silently; do not print input filenames.

       -o file   Direct output to named file.

       -w num    Format output no wider than num (decimal) columns. This
                 option defaults to 80 if num is not specified or is less than
                 51.

       -D        Equivalent to c99.

       -I        Equivalent to c99.

       -U        Equivalent to c99.

OPERANDS
       The following operand shall be supported:

       file      A pathname of a C-language source file.

STDIN
       Not used.

INPUT FILES
       The input files are C-language source files.

ENVIRONMENT VARIABLES
       The following environment variables shall affect the execution of
       cxref:

       LANG      Provide a default value for the internationalization
                 variables that are unset or null. (See the Base Definitions
                 volume of POSIX.1-2017, Section 8.2, Internationalization
                 Variables for the precedence of internationalization
                 variables used to determine the values of locale categories.)

       LC_ALL    If set to a non-empty string value, override the values of
                 all the other internationalization variables.

       LC_COLLATE
                 Determine the locale for the ordering of the output.

       LC_CTYPE  Determine the locale for the interpretation of sequences of
                 bytes of text data as characters (for example, single-byte as
                 opposed to multi-byte characters in arguments and input
                 files).

       LC_MESSAGES
                 Determine the locale that should be used to affect the format
                 and contents of diagnostic messages written to standard
                 error.

       NLSPATH   Determine the location of message catalogs for the processing
                 of LC_MESSAGES.

ASYNCHRONOUS EVENTS
       Default.

STDOUT
       The standard output shall be used for the cross-reference listing,
       unless the -o option is used to select a different output file.

       The format of standard output is unspecified, except that the following
       information shall be included:

        *  If the -c option is not specified, each portion of the listing
           shall start with the name of the input file on a separate line.

        *  The name line shall be followed by a sorted list of symbols, each
           with its associated location pathname, the name of the function in
           which it appears (if it is not a function name itself), and line
           number references.

        *  Each line number may be preceded by an <asterisk> ('*') flag,
           meaning that this is the declaring reference. Other single-
           character flags, with implementation-defined meanings, may be
           included.

STDERR
       The standard error shall be used only for diagnostic messages.

OUTPUT FILES
       The output file named by the -o option shall be used instead of
       standard output.

EXTENDED DESCRIPTION
       None.

EXIT STATUS
       The following exit values shall be returned:

        0    Successful completion.

       >0    An error occurred.

CONSEQUENCES OF ERRORS
       Default.

       The following sections are informative.

APPLICATION USAGE
       None.

EXAMPLES
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       c99

       The Base Definitions volume of POSIX.1-2017, Chapter 8, Environment
       Variables, Section 12.2, Utility Syntax Guidelines

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  In the event of any discrepancy between this version and the
       original IEEE and The Open Group Standard, the original IEEE and The
       Open Group Standard is the referee document. The original Standard can
       be obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                  2017                            CXREF(1P)