IFNAMES(1)                       User Commands                      IFNAMES(1)

NAME
       ifnames - Extract CPP conditionals from a set of files

SYNOPSIS
       ifnames [OPTION]... [FILE]...

DESCRIPTION
       Scan all of the C source FILES (or the standard input, if none are
       given) and write to the standard output a sorted list of all the
       identifiers that appear in those files in '#if', '#elif', '#ifdef', or
       '#ifndef' directives.  Print each identifier on a line, followed by a
       space-separated list of the files in which that identifier occurs.

       -h, --help
              print this help, then exit

       -V, --version
              print version number, then exit

AUTHOR
       Written by David J. MacKenzie and Paul Eggert.

REPORTING BUGS
       Report bugs to <bug-autoconf@gnu.org>, or via Savannah:
       <https://savannah.gnu.org/support/?group=autoconf>.

COPYRIGHT
       Copyright (C) 2023 Free Software Foundation, Inc.  License
       GPLv3+/Autoconf: GNU GPL version 3 or later
       <https://gnu.org/licenses/gpl.html>,
       <https://gnu.org/licenses/exceptions.html>
       This is free software: you are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.

SEE ALSO
       autoconf(1), automake(1), autoreconf(1), autoupdate(1), autoheader(1),
       autoscan(1), config.guess(1), config.sub(1), ifnames(1), libtool(1).

       The full documentation for Autoconf is maintained as a Texinfo manual.
       To read the manual locally, use the command

              info autoconf

       You can also consult the Web version of the manual at
       <https://gnu.org/software/autoconf/manual/>.

GNU Autoconf 2.72                December 2023                      IFNAMES(1)