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# ===========================================================================
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# http://autoconf-archive.cryp.to/ax_prefix_config_h.html
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# ===========================================================================
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# AX_PREFIX_CONFIG_H [(OUTPUT-HEADER [,PREFIX [,ORIG-HEADER]])]
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# This is a new variant from ac_prefix_config_ this one will use a
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# lowercase-prefix if the config-define was starting with a
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# lowercase-char, e.g. "#define const", "#define restrict", or "#define
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# off_t", (and this one can live in another directory, e.g.
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# testpkg/config.h therefore I decided to move the output-header to be the
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# takes the usual config.h generated header file; looks for each of the
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# generated "#define SOMEDEF" lines, and prefixes the defined name (ie.
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# makes it "#define PREFIX_SOMEDEF". The result is written to the output
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# config.header file. The PREFIX is converted to uppercase for the
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# OUTPUT-HEADER = $PACKAGE-config.h
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# ORIG-HEADER, from AM_CONFIG_HEADER(config.h)
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# Your configure.ac script should contain both macros in this order, and
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# unlike the earlier variations of this prefix-macro it is okay to place
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# the AX_PREFIX_CONFIG_H call before the AC_OUTPUT invokation.
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# AC_INIT(config.h.in) # config.h.in as created by "autoheader"
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# AM_INIT_AUTOMAKE(testpkg, 0.1.1) # makes #undef VERSION and PACKAGE
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# AM_CONFIG_HEADER(config.h) # prep config.h from config.h.in
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# AX_PREFIX_CONFIG_H(mylib/_config.h) # prep mylib/_config.h from it..
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# AC_MEMORY_H # makes "#undef NEED_MEMORY_H"
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# AC_C_CONST_H # makes "#undef const"
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# AC_OUTPUT(Makefile) # creates the "config.h" now
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# # and also mylib/_config.h
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# if the argument to AX_PREFIX_CONFIG_H would have been omitted then the
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# default outputfile would have been called simply "testpkg-config.h", but
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# even under the name "mylib/_config.h" it contains prefix-defines like
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# #ifndef TESTPKG_VERSION
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# #define TESTPKG_VERSION "0.1.1"
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# #ifndef TESTPKG_NEED_MEMORY_H
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# #define TESTPKG_NEED_MEMORY_H 1
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# #ifndef _testpkg_const
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# #define _testpkg_const _const
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# and this "mylib/_config.h" can be installed along with other
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# header-files, which is most convenient when creating a shared library
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# (that has some headers) where some functionality is dependent on the
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# OS-features detected at compile-time. No need to invent some
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# "mylib-confdefs.h.in" manually. :-)
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# Note that some AC_DEFINEs that end up in the config.h file are actually
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# self-referential - e.g. AC_C_INLINE, AC_C_CONST, and the AC_TYPE_OFF_T
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# say that they "will define inline|const|off_t if the system does not do
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# it by itself". You might want to clean up about these - consider an
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# extra mylib/conf.h that reads something like:
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# #include <mylib/_config.h>
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# #ifndef _testpkg_const
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# #define _testpkg_const const
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# and then start using _testpkg_const in the header files. That is also a
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# good thing to differentiate whether some library-user has starting to
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# take up with a different compiler, so perhaps it could read something
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# #include <mylib/_msvc.h>
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# #include <mylib/_config.h>
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# #ifndef _testpkg_const
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# #define _testpkg_const const
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# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
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# Copyright (c) 2008 Marten Svantesson
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# Copyright (c) 2008 Gerald Point <Gerald.Point@labri.fr>
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 2 of the License, or (at your
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# option) any later version.
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Archive. When you make and distribute a
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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AC_DEFUN([AX_PREFIX_CONFIG_H],[dnl
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AC_BEFORE([AC_CONFIG_HEADERS],[$0])dnl
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AC_CONFIG_COMMANDS([ifelse($1,,$PACKAGE-config.h,$1)],[dnl
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AS_VAR_PUSHDEF([_OUT],[ac_prefix_conf_OUT])dnl
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AS_VAR_PUSHDEF([_DEF],[ac_prefix_conf_DEF])dnl
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AS_VAR_PUSHDEF([_PKG],[ac_prefix_conf_PKG])dnl
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AS_VAR_PUSHDEF([_LOW],[ac_prefix_conf_LOW])dnl
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AS_VAR_PUSHDEF([_UPP],[ac_prefix_conf_UPP])dnl
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AS_VAR_PUSHDEF([_INP],[ac_prefix_conf_INP])dnl
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m4_pushdef([_script],[conftest.prefix])dnl
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m4_pushdef([_symbol],[m4_cr_Letters[]m4_cr_digits[]_])dnl
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_OUT=`echo ifelse($1, , $PACKAGE-config.h, $1)`
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_DEF=`echo _$_OUT | sed -e "y:m4_cr_letters:m4_cr_LETTERS[]:" -e "s/@<:@^m4_cr_Letters@:>@/_/g"`
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_PKG=`echo ifelse($2, , $PACKAGE, $2)`
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_LOW=`echo _$_PKG | sed -e "y:m4_cr_LETTERS-:m4_cr_letters[]_:"`
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_UPP=`echo $_PKG | sed -e "y:m4_cr_letters-:m4_cr_LETTERS[]_:" -e "/^@<:@m4_cr_digits@:>@/s/^/_/"`
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_INP=`echo "ifelse($3,,,$3)" | sed -e 's/ *//'`
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if test ".$_INP" = "."; then
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for ac_file in : $CONFIG_HEADERS; do test "_$ac_file" = _: && continue
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*.h) _INP=$ac_file ;;
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test ".$_INP" != "." && break
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if test ".$_INP" = "."; then
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*/*) _INP=`basename "$_OUT"`
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*-*) _INP=`echo "$_OUT" | sed -e "s/@<:@_symbol@:>@*-//"`
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if test -z "$_PKG" ; then
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AC_MSG_ERROR([no prefix for _PREFIX_PKG_CONFIG_H])
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if test ! -f "$_INP" ; then if test -f "$srcdir/$_INP" ; then
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AC_MSG_NOTICE(creating $_OUT - prefix $_UPP for $_INP defines)
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if test -f $_INP ; then
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echo "s/^@%:@undef *\\(@<:@m4_cr_LETTERS[]_@:>@\\)/@%:@undef $_UPP""_\\1/" > _script
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echo "s/^@%:@undef *\\(@<:@m4_cr_letters@:>@\\)/@%:@undef $_LOW""_\\1/" >> _script
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echo "s/^@%:@def[]ine *\\(@<:@m4_cr_LETTERS[]_@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_UPP""_\\1 \\" >> _script
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echo "@%:@def[]ine $_UPP""_\\1 \\2 \\" >> _script
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echo "@%:@endif/" >>_script
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echo "s/^@%:@def[]ine *\\(@<:@m4_cr_letters@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_LOW""_\\1 \\" >> _script
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echo "@%:@define $_LOW""_\\1 \\2 \\" >> _script
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echo "@%:@endif/" >> _script
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# now executing _script on _DEF input to create _OUT output file
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echo "@%:@ifndef $_DEF" >$tmp/pconfig.h
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echo "@%:@def[]ine $_DEF 1" >>$tmp/pconfig.h
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echo ' ' >>$tmp/pconfig.h
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echo /'*' $_OUT. Generated automatically at end of configure. '*'/ >>$tmp/pconfig.h
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sed -f _script $_INP >>$tmp/pconfig.h
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echo ' ' >>$tmp/pconfig.h
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echo '/* once:' $_DEF '*/' >>$tmp/pconfig.h
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echo "@%:@endif" >>$tmp/pconfig.h
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if cmp -s $_OUT $tmp/pconfig.h 2>/dev/null; then
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AC_MSG_NOTICE([$_OUT is unchanged])
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ac_dir=`AS_DIRNAME(["$_OUT"])`
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AS_MKDIR_P(["$ac_dir"])
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mv $tmp/pconfig.h "$_OUT"
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cp _script _configs.sed
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AC_MSG_ERROR([input file $_INP does not exist - skip generating $_OUT])
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m4_popdef([_symbol])dnl
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m4_popdef([_script])dnl
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AS_VAR_POPDEF([_INP])dnl
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AS_VAR_POPDEF([_UPP])dnl
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AS_VAR_POPDEF([_LOW])dnl
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AS_VAR_POPDEF([_PKG])dnl
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AS_VAR_POPDEF([_DEF])dnl
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AS_VAR_POPDEF([_OUT])dnl
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],[PACKAGE="$PACKAGE"])])
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dnl implementation note: a bug report (31.5.2005) from Marten Svantesson points
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dnl out a problem where `echo "\1"` results in a Control-A. The unix standard
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dnl http://www.opengroup.org/onlinepubs/000095399/utilities/echo.html
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dnl defines all backslash-sequences to be inherently non-portable asking
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dnl for replacement mit printf. Some old systems had problems with that
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dnl one either. However, the latest libtool (!) release does export an $ECHO
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dnl (and $echo) that does the right thing - just one question is left: what
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dnl was the first version to have it? Is it greater 2.58 ?
added
removed
acinclude.m4
