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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
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Autoconf Macro: ax_prefix_config_h
</title>
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<hr>
<h1>
ax_prefix_config_h
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AX_PREFIX_CONFIG_H [(OUTPUT-HEADER [,PREFIX [,ORIG-HEADER]])]</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
This is a new variant from ac_prefix_config_ this one will use a
lowercase-prefix if the config-define was starting with a lowercase-char,
e.g. "#define const", "#define restrict", or "#define off_t", (and this one
can live in another directory, e.g. testpkg/config.h therefore I decided to
move the output-header to be the first arg)
</p>
<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.
</p>
<p>
Defaults:
</p>
<pre>
OUTPUT-HEADER = $PACKAGE-config.h
PREFIX = $PACKAGE
ORIG-HEADER, from AM_CONFIG_HEADER(config.h)
</pre>
<p>
Your configure.ac script should contain both macros in this order, and
unlike the earlier variations of this prefix-macro it is okay to place the
AX_PREFIX_CONFIG_H call before the AC_OUTPUT invokation.
</p>
<p>
Example:
</p>
<pre>
AC_INIT(config.h.in) # config.h.in as created by "autoheader"
AM_INIT_AUTOMAKE(testpkg, 0.1.1) # makes #undef VERSION and PACKAGE
AM_CONFIG_HEADER(config.h) # prep config.h from config.h.in
AX_PREFIX_CONFIG_H(mylib/_config.h) # prep mylib/_config.h from it..
AC_MEMORY_H # makes "#undef NEED_MEMORY_H"
AC_C_CONST_H # makes "#undef const"
AC_OUTPUT(Makefile) # creates the "config.h" now
# and also mylib/_config.h
</pre>
<p>
if the argument to AX_PREFIX_CONFIG_H would have been omitted then the
default outputfile would have been called simply "testpkg-config.h", but
even under the name "mylib/_config.h" it contains prefix-defines like
</p>
<pre>
#ifndef TESTPKG_VERSION
#define TESTPKG_VERSION "0.1.1"
#endif
#ifndef TESTPKG_NEED_MEMORY_H
#define TESTPKG_NEED_MEMORY_H 1
#endif
#ifndef _testpkg_const
#define _testpkg_const _const
#endif
</pre>
<p>
and this "mylib/_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 "mylib-confdefs.h.in" manually. :-)
</p>
<p>
Note that some AC_DEFINEs that end up in the config.h file are actually
self-referential - e.g. AC_C_INLINE, AC_C_CONST, and the AC_TYPE_OFF_T say
that they "will define inline|const|off_t if the system does not do it by
itself". You might want to clean up about these - consider an extra
mylib/conf.h that reads something like:
</p>
<pre>
#include <mylib/_config.h>
#ifndef _testpkg_const
#define _testpkg_const const
#endif
</pre>
<p>
and then start using _testpkg_const in the header files. That is also a
good thing to differentiate whether some library-user has starting to take
up with a different compiler, so perhaps it could read something like this:
</p>
<pre>
#ifdef _MSC_VER
#include <mylib/_msvc.h>
#else
#include <mylib/_config.h>
#endif
#ifndef _testpkg_const
#define _testpkg_const const
#endif
</pre>
</div>
<h2>
Author
</h2>
<p class="indent">
Guido Draheim <guidod@gmx.de>, Mårten Svantesson
<msv@kth.se>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2005-06-08
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AX_PREFIX_CONFIG_H],[AC_REQUIRE([AC_CONFIG_HEADER])
AC_CONFIG_COMMANDS([ifelse($1,,$PACKAGE-config.h,$1)],[dnl
AS_VAR_PUSHDEF([_OUT],[ac_prefix_conf_OUT])dnl
AS_VAR_PUSHDEF([_DEF],[ac_prefix_conf_DEF])dnl
AS_VAR_PUSHDEF([_PKG],[ac_prefix_conf_PKG])dnl
AS_VAR_PUSHDEF([_LOW],[ac_prefix_conf_LOW])dnl
AS_VAR_PUSHDEF([_UPP],[ac_prefix_conf_UPP])dnl
AS_VAR_PUSHDEF([_INP],[ac_prefix_conf_INP])dnl
m4_pushdef([_script],[conftest.prefix])dnl
m4_pushdef([_symbol],[m4_cr_Letters[]m4_cr_digits[]_])dnl
_OUT=`printf '%s\n' ifelse($1, , $PACKAGE-config.h, $1)`
_DEF=`printf '%s\n' _$_OUT | sed -e "y:m4_cr_letters:m4_cr_LETTERS[]:" -e "s/@<:@^m4_cr_Letters@:>@/_/g"`
_PKG=`printf '%s\n' ifelse($2, , $PACKAGE, $2)`
_LOW=`printf '%s\n' _$_PKG | sed -e "y:m4_cr_LETTERS-:m4_cr_letters[]_:"`
_UPP=`printf '%s\n' $_PKG | sed -e "y:m4_cr_letters-:m4_cr_LETTERS[]_:" -e "/^@<:@m4_cr_digits@:>@/s/^/_/"`
_INP=`printf '%s\n' "ifelse($3,,,$3)" | sed -e 's/ *//'`
if test ".$_INP" = "."; then
for ac_file in : $CONFIG_HEADERS; do test "_$ac_file" = _: && continue
case "$ac_file" in
*.h) _INP=$ac_file ;;
*)
esac
test ".$_INP" != "." && break
done
fi
if test ".$_INP" = "."; then
case "$_OUT" in
*/*) _INP=`basename "$_OUT"`
;;
*-*) _INP=`printf '%s\n' "$_OUT" | sed -e "s/@<:@_symbol@:>@*-//"`
;;
*) _INP=config.h
;;
esac
fi
if test -z "$_PKG" ; then
AC_MSG_ERROR([no prefix for _PREFIX_PKG_CONFIG_H])
else
if test ! -f "$_INP" ; then if test -f "$srcdir/$_INP" ; then
_INP="$srcdir/$_INP"
fi fi
AC_MSG_NOTICE(creating $_OUT - prefix $_UPP for $_INP defines)
if test -f $_INP ; then
printf '%s\n' "s/@%:@undef *\\(@<:@m4_cr_LETTERS[]_@:>@\\)/@%:@undef $_UPP""_\\1/" > _script
printf '%s\n' "s/@%:@undef *\\(@<:@m4_cr_letters@:>@\\)/@%:@undef $_LOW""_\\1/" >> _script
printf '%s\n' "s/@%:@def[]ine *\\(@<:@m4_cr_LETTERS[]_@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_UPP""_\\1 \\" >> _script
printf '%s\n' "@%:@def[]ine $_UPP""_\\1 \\2 \\" >> _script
printf '%s\n' "@%:@endif/" >>_script
printf '%s\n' "s/@%:@def[]ine *\\(@<:@m4_cr_letters@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_LOW""_\\1 \\" >> _script
printf '%s\n' "@%:@define $_LOW""_\\1 \\2 \\" >> _script
printf '%s\n' "@%:@endif/" >> _script
# now executing _script on _DEF input to create _OUT output file
printf '%s\n' "@%:@ifndef $_DEF" >$tmp/pconfig.h
printf '%s\n' "@%:@def[]ine $_DEF 1" >>$tmp/pconfig.h
printf '%s\n' ' ' >>$tmp/pconfig.h
printf '%s\n' /'*' $_OUT. Generated automatically at end of configure. '*'/ >>$tmp/pconfig.h
sed -f _script $_INP >>$tmp/pconfig.h
printf '%s\n' ' ' >>$tmp/pconfig.h
printf '%s\n' '/* once:' $_DEF '*/' >>$tmp/pconfig.h
printf '%s\n' "@%:@endif" >>$tmp/pconfig.h
if cmp -s $_OUT $tmp/pconfig.h 2>/dev/null; then
AC_MSG_NOTICE([$_OUT is unchanged])
else
ac_dir=`AS_DIRNAME(["$_OUT"])`
AS_MKDIR_P(["$ac_dir"])
rm -f "$_OUT"
mv $tmp/pconfig.h "$_OUT"
fi
cp _script _configs.sed
else
AC_MSG_ERROR([input file $_INP does not exist - skip generating $_OUT])
fi
rm -f conftest.*
fi
m4_popdef([_symbol])dnl
m4_popdef([_script])dnl
AS_VAR_POPDEF([_INP])dnl
AS_VAR_POPDEF([_UPP])dnl
AS_VAR_POPDEF([_LOW])dnl
AS_VAR_POPDEF([_PKG])dnl
AS_VAR_POPDEF([_DEF])dnl
AS_VAR_POPDEF([_OUT])dnl
],[PACKAGE="$PACKAGE"])])
</pre>
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