.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.47.16.
.TH IFNAMES "1" "December 2020" "GNU Autoconf 2.69" "User Commands"
.SH NAME
ifnames \- Extract CPP conditionals from a set of files
.SH SYNOPSIS
.B ifnames
[\fI\,OPTION\/\fR]... [\fI\,FILE\/\fR]...
.SH 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.
.TP
\fB\-h\fR, \fB\-\-help\fR
print this help, then exit
.TP
\fB\-V\fR, \fB\-\-version\fR
print version number, then exit
.SH AUTHOR
Written by David J. MacKenzie and Paul Eggert.
.SH "REPORTING BUGS"
Report bugs to <bug\-autoconf@gnu.org>.
.br
GNU Autoconf home page: <http://www.gnu.org/software/autoconf/>.
.br
General help using GNU software: <http://www.gnu.org/gethelp/>.
.SH COPYRIGHT
Copyright \(co 2012 Free Software Foundation, Inc.
License GPLv3+/Autoconf: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>, <http://gnu.org/licenses/exceptions.html>
.br
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
.SH "SEE ALSO"
.BR autoconf (1),
.BR automake (1),
.BR autoreconf (1),
.BR autoupdate (1),
.BR autoheader (1),
.BR autoscan (1),
.BR config.guess (1),
.BR config.sub (1),
.BR ifnames (1),
.BR libtool (1).
.PP
The full documentation for
.B ifnames
is maintained as a Texinfo manual.  If the
.B info
and
.B ifnames
programs are properly installed at your site, the command
.IP
.B info ifnames
.PP
should give you access to the complete manual.