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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
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Autoconf Macro: ax_auto_include_headers
</title>
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<hr>
<h1>
ax_auto_include_headers
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AX_AUTO_INCLUDE_HEADERS(INCLUDE-FILE ...)</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
Given a space-separated list of INCLUDE-FILEs, AX_AUTO_INCLUDE_HEADERS will
output a conditional #include for each INCLUDE-FILE. The following example
demonstrates how AX_AUTO_INCLUDE_HEADERS's might be used in a configure.ac
script:
</p>
<pre>
AH_BOTTOM([
AX_AUTO_INCLUDE_HEADERS([sys/resource.h invent.h sys/sysinfo.h])dnl
])
</pre>
<p>
The preceding invocation instructs autoheader to put the following code at
the bottom of the config.h file:
</p>
<pre>
#ifdef HAVE_SYS_RESOURCE_H
# include <sys/resource.h>
#endif
#ifdef HAVE_INVENT_H
# include <invent.h>
#endif
#ifdef HAVE_SYS_SYSINFO_H
# include <sys/sysinfo.h>
#endif
</pre>
<p>
Note that AX_AUTO_INCLUDE_HEADERS merely outputs #ifdef/#include/#endif
blocks. The configure.ac script still needs to invoke AC_CHECK_HEADERS to
#define the various HAVE_*_H preprocessor macros.
</p>
<p>
Here's an easy way to get from config.h a complete list of header files who
existence is tested by the configure script:
</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 and incorporate it into one
or more calls to AX_AUTO_INCLUDE_HEADERS.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Scott Pakin <pakin@uiuc.edu>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2006-10-22
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AX_AUTO_INCLUDE_HEADERS], [dnl
AC_FOREACH([AX_Header], [$1], [dnl
m4_pushdef([AX_IfDef], AS_TR_CPP(HAVE_[]AX_Header))dnl
[#]ifdef AX_IfDef
[#] include <AX_Header>
[#]endif
m4_popdef([AX_IfDef])dnl
])])
</pre>
</div>
<h2>
License
</h2>
<div class="indent">
<span style="white-space:nowrap;">Copyright © 2006 Scott Pakin
<pakin@uiuc.edu></span>
<p>
Copying and distribution of this file, with or without modification, are
permitted in any medium without royalty provided the copyright notice and
this notice are preserved.
</p>
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