.\" Copyright (C) 1992, 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
.\" Copyright (C) 1998 Ben Pfaff.
.\"
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.\" this manual provided the copyright notice and this permission notice
.\" are preserved on all copies.
.\" 
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.\" manual under the conditions for verbatim copying, provided that the entire
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.\"
.TH IFNAMES 1 "Autoconf"
.SH NAME
ifnames2.13 - print identifiers that a package uses in C preprocessor
conditionals
.SH SYNOPSIS
.B ifnames2.13
[
.B --help
|
.B -h
] [
.B --macrodir=dir
|
.B -m dir
] [
.B --version
]
.SH DESCRIPTION
.PP
.B ifnames2.13
can help when writing a 
.B configure.in
for a software
package.  It prints the identifiers that the package already uses in C
preprocessor conditionals.  If a package has already been set up to
have some portability, this program can help you figure out what its
.B configure
needs to check for.  It may help fill in some gaps in a
.B configure.in
generated by 
.B autoscan2.13
(see 
.BR autoscan2.13 (1)).
.PP
.B ifnames2.13
scans all of the C source files named on the command line
(or the standard input, if none are given) and writes to the standard
output a sorted list of all the identifiers that appear in those files
in 
.BR #if , 
.BR #elif , 
.BR #ifdef , 
or 
.B #ifndef
directives.  It prints each
identifier on a line, followed by a space-separated list of the files
in which that identifier occurs.
.PP
.B ifnames2.13
accepts the following options:
.TP
.BI --help
.TP
.BI -h
Print a summary of the command line options and exit.
.TP
.BI --macrodir=DIR
.TP
.BI -m\ DIR
Look for the installed macro files in directory DIR.  You can also
set the 
.B AC_MACRODIR
environment variable to a directory; this
option overrides the environment variable.
.TP
.BI --version
Print the version number of Autoconf and exit.
.PP
.SH "SEE ALSO"
.BR autoconf2.13 (1),
.BR autoheader2.13 (1),
.BR autoreconf2.13 (1),
.BR autoscan2.13 (1),
.BR autoupdate2.13 (1)
.SH AUTHORS
David MacKenzie, with help from Franc,ois Pinard, Karl Berry, Richard
Pixley, Ian Lance Taylor, Roland McGrath, Noah Friedman, David
D. Zuhn, and many others.  This manpage written by Ben Pfaff
<pfaffben@debian.org> for the Debian GNU/Linux
.B autoconf2.13
package.