From Linux Man Pages
ifnames - Extract CPP conditionals from a set of files
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' direc-
tives. 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
REPORTING BUGS
Report bugs to <bug-autoconf@gnu.org>.
COPYRIGHT
Copyright � 2006 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.
RELATED
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 prop-
erly installed at your site, the command
info ifnames
should give you access to the complete manual.
CATEGORY