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.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.49.3.
.TH IFNAMES "1" "December 2023" "GNU Autoconf 2.72" "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
.MT bug-autoconf@gnu.org
.ME ,
or via Savannah:
.UR https://savannah.gnu.org/support/?group=autoconf
.UE .
.SH COPYRIGHT
Copyright \(co 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>
.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).
The full documentation for Autoconf is maintained as a Texinfo manual.
To read the manual locally, use the command
.IP
.B info autoconf
.PP
You can also consult the Web version of the manual at
.UR https://gnu.org/software/autoconf/manual/
.UE .
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