ifnames - Extract CPP conditionals from a set of files

       Written by David J. MacKenzie and Paul Eggert.

       Copyright 1994, 1995, 1999, 2000 Free Software Foundation, Inc.
       This is free software; see the source for copying  conditions.   There  is  NO  warranty;  not  even  for
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

       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

       ifnames - Extract CPP conditionals from a set of files

       Report bugs to <dickey@invisible-island.net>.

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

       The full documentation for ifnames is maintained as a Texinfo manual.  If the info and  ifnames  programs
       are properly installed at your site, the command

              infoifnames

       should give you access to the complete manual.

GNU Autoconf 2.52.20240618                          June 2024                                         IFNAMES(1)

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