ifnames - Extract CPP conditionals from a set of files
ifnames [OPTION] ... [FILE] ...
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
Written by David J. MacKenzie and Paul Eggert.
Report bugs to <bug-autoconf@gnu.org>.
Copyright
© 2006 Free Software Foundation, Inc.
This is free software. You may redistribute copies of it
under the terms of the GNU General Public License
<http://www.gnu.org/licenses/gpl.html>. There is NO
WARRANTY, to the extent permitted by law.
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 ifnames is maintained as a Texinfo manual. If the info and ifnames programs are properly installed at your site, the command
info ifnames
should give you access to the complete manual.