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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
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<title>
Autoconf Macro: ac_prefix_config_h
</title>
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M4 Source</a>
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<hr>
<h1>
ac_prefix_config_h
</h1>
<h2>
Obsolete Macro
</h2>
<p class="indent">
Use AX_PREFIX_CONFIG_H.
</p>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AC_PREFIX_CONFIG_H [(PREFIX [,ORIG-HEADER [,OUTPUT-HEADER]])]</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
takes the usual config.h generated header file; looks for each of the
generated "#define SOMEDEF" lines, and prefixes the defined name (ie. makes
it "#define PREFIX_SOMEDEF". The result is written to the output
config.header file. The PREFIX is converted to uppercase for the
conversions. If PREFIX is absent, $PACKAGE will be assumed. If the
ORIG-HEADER is absent, "config.h" will be assumed. If the OUTPUT-HEADER is
absent, "PREFIX-config.h" will be assumed.
</p>
<p>
In most cases, the configure.in will contain a line saying
</p>
<pre>
AC_CONFIG_HEADER(config.h)
</pre>
<p>
somewhere *before* AC_OUTPUT and a simple line saying
</p>
<pre>
AC_PREFIX_CONFIG_HEADER
</pre>
<p>
somewhere *after* AC_OUTPUT.
</p>
<p>
example:
</p>
<pre>
AC_INIT(config.h.in) # config.h.in as created by "autoheader"
AM_INIT_AUTOMAKE(testpkg, 0.1.1) # "#undef VERSION" and "PACKAGE"
AM_CONFIG_HEADER(config.h) # in config.h.in
AC_MEMORY_H # "#undef NEED_MEMORY_H"
AC_C_CONST_H # "#undef const"
AC_OUTPUT(Makefile) # creates the "config.h" now
AC_PREFIX_CONFIG_H # creates "testpkg-config.h"
and the resulting "testpkg-config.h" contains lines like
#define TESTPKG_VERSION "0.1.1"
#define TESTPKG_NEED_MEMORY_H 1
#define TESTPKG_const const
and this "testpkg-config.h" can be installed along with other
header-files, which is most convenient when creating a shared
library (that has some headers) where some functionality is
dependent on the OS-features detected at compile-time. No
need to invent some "testpkg-confdefs.h.in" manually. :-)
</pre>
</div>
<h2>
Author
</h2>
<p class="indent">
Guido Draheim <guidod@gmx.de>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2005-01-25
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AC_PREFIX_CONFIG_H],
[changequote(<<, >>)dnl
ac_prefix_conf_PKG=`echo ifelse($1, , $PACKAGE, $1)`
ac_prefix_conf_PRE=`echo $ac_prefix_conf_PKG | tr 'abcdefghijklmnopqrstuvwxyz-' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ_'`
ac_prefix_conf_PRE=`echo $ac_prefix_conf_PRE | sed -e '/^[0-9]/s/^/_/'`
ac_prefix_conf_INP=`echo ifelse($2, , config.h, $2)`
ac_prefix_conf_OUT=`echo ifelse($3, , $ac_prefix_conf_PKG-$ac_prefix_conf_INP, $3)`
ac_prefix_conf_DEF=`echo _$ac_prefix_conf_OUT | tr 'abcdefghijklmnopqrstuvwxyz./,-' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ____'`
changequote([, ])dnl
if test -z "$ac_prefix_conf_PKG" ; then
AC_MSG_ERROR([no prefix for _PREFIX_CONFIG_H])
else
AC_MSG_RESULT(creating $ac_prefix_conf_OUT - prefix $ac_prefix_conf_PRE for $ac_prefix_conf_INP defines)
if test -f $ac_prefix_conf_INP ; then
echo '#ifndef '$ac_prefix_conf_DEF >$ac_prefix_conf_OUT
echo '#define '$ac_prefix_conf_DEF' 1' >>$ac_prefix_conf_OUT
echo ' ' >>$ac_prefix_conf_OUT
echo /'*' $ac_prefix_conf_OUT. Generated automatically at end of configure. '*'/ >>$ac_prefix_conf_OUT
echo 's/#undef */#undef '$ac_prefix_conf_PRE'_/' >conftest.sed
echo 's/#define *\([A-Za-z0-9_]*\)\(.*\)/#ifndef '$ac_prefix_conf_PRE"_\\1 \\" >>conftest.sed
echo '#define '$ac_prefix_conf_PRE"_\\1 \\2 \\" >>conftest.sed
echo '#endif/' >>conftest.sed
sed -f conftest.sed $ac_prefix_conf_INP >>$ac_prefix_conf_OUT
echo ' ' >>$ac_prefix_conf_OUT
echo '/*' $ac_prefix_conf_DEF '*/' >>$ac_prefix_conf_OUT
echo '#endif' >>$ac_prefix_conf_OUT
else
AC_MSG_ERROR([input file $ac_prefix_conf_IN does not exist, dnl
skip generating $ac_prefix_conf_OUT])
fi
rm -f conftest.*
fi])
</pre>
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