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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
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<head>
<title>
Autoconf Macro: ac_auto_include_headers
</title>
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<body>
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<tr>
<td style="width:50%;" align="center">
<a href=
"http://autoconf-archive.cryp.to/ac_auto_include_headers.m4">Download M4
Source</a>
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<hr>
<h1>
ac_auto_include_headers
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AC_AUTO_INCLUDE_HEADERS (HEADER-FILE, INCLUDE-FILE ...)</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
Given a HEADER-FILE and a space-separated list of INCLUDE-FILEs,
AC_AUTO_INCLUDE_HEADERS will append to HEADER-FILE a conditional #include
for each INCLUDE-FILE. For instance, the following macro call:
</p>
<pre>
AC_AUTO_INCLUDE_HEADERS([config-inc.h], [sys/foobar.h])
</pre>
<p>
will append the following text to config-inc.h:
</p>
<pre>
#ifdef HAVE_SYS_FOOBAR_H
# include <sys/foobar.h>
#endif
</pre>
<p>
AC_AUTO_INCLUDE_HEADERS makes it easy to auto-generate a single header file
that can then be #include'd by multiple files in a project. Because the
#ifdef's are appended to HEADER-FILE, it's also convenient to include
additional text in that file. For instance:
</p>
<pre>
cat <<\CIH_EOF > config-inc.h
/* This file was generated automatically by configure. */
#ifndef _CONFIG_INC_H_
#define _CONFIG_INC_H_
#include <stdio.h>
CIH_EOF
AC_AUTO_INCLUDE_HEADERS([config-inc.h], [arpa/inet.h dlfcn.h errno.h])
echo "#endif" >> config-inc.h
</pre>
<p>
Here's an easy way to get a complete list of header files from config.h:
</p>
<pre>
cat config.h | perl -ane '/ HAVE_\S+_H / && do {$_=$F[$#F-1]; s/^HAVE_//; s/_H/.h/; s|_|/|g; tr/A-Z/a-z/; print "$_ "}'
</pre>
<p>
You can then manually edit the resulting list.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Scott Pakin <pakin@uiuc.edu>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2002-03-04
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AC_AUTO_INCLUDE_HEADERS],
[touch $1
for ac_auto_include_file in $2; do
ac_auto_include_have=`echo $ac_auto_include_file | sed 'y%./*abcdefghijklmnopqrstuvwxyz%__PABCDEFGHIJKLMNOPQRSTUVWXYZ%;s%[^_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789]%_%g'`
echo "#ifdef HAVE_$ac_auto_include_have" >> $1
echo "# include <$ac_auto_include_file>" >> $1
echo "#endif" >> $1
echo "" >> $1
done])
</pre>
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