1# =========================================================================== 2# http://autoconf-archive.cryp.to/ax_prefix_config_h.html 3# =========================================================================== 4# 5# SYNOPSIS 6# 7# AX_PREFIX_CONFIG_H [(OUTPUT-HEADER [,PREFIX [,ORIG-HEADER]])] 8# 9# DESCRIPTION 10# 11# This is a new variant from ac_prefix_config_ this one will use a 12# lowercase-prefix if the config-define was starting with a 13# lowercase-char, e.g. "#define const", "#define restrict", or "#define 14# off_t", (and this one can live in another directory, e.g. 15# testpkg/config.h therefore I decided to move the output-header to be the 16# first arg) 17# 18# takes the usual config.h generated header file; looks for each of the 19# generated "#define SOMEDEF" lines, and prefixes the defined name (ie. 20# makes it "#define PREFIX_SOMEDEF". The result is written to the output 21# config.header file. The PREFIX is converted to uppercase for the 22# conversions. 23# 24# Defaults: 25# 26# OUTPUT-HEADER = $PACKAGE-config.h 27# PREFIX = $PACKAGE 28# ORIG-HEADER, from AM_CONFIG_HEADER(config.h) 29# 30# Your configure.ac script should contain both macros in this order, and 31# unlike the earlier variations of this prefix-macro it is okay to place 32# the AX_PREFIX_CONFIG_H call before the AC_OUTPUT invokation. 33# 34# Example: 35# 36# AC_INIT(config.h.in) # config.h.in as created by "autoheader" 37# AM_INIT_AUTOMAKE(testpkg, 0.1.1) # makes #undef VERSION and PACKAGE 38# AM_CONFIG_HEADER(config.h) # prep config.h from config.h.in 39# AX_PREFIX_CONFIG_H(mylib/_config.h) # prep mylib/_config.h from it.. 40# AC_MEMORY_H # makes "#undef NEED_MEMORY_H" 41# AC_C_CONST_H # makes "#undef const" 42# AC_OUTPUT(Makefile) # creates the "config.h" now 43# # and also mylib/_config.h 44# 45# if the argument to AX_PREFIX_CONFIG_H would have been omitted then the 46# default outputfile would have been called simply "testpkg-config.h", but 47# even under the name "mylib/_config.h" it contains prefix-defines like 48# 49# #ifndef TESTPKG_VERSION 50# #define TESTPKG_VERSION "0.1.1" 51# #endif 52# #ifndef TESTPKG_NEED_MEMORY_H 53# #define TESTPKG_NEED_MEMORY_H 1 54# #endif 55# #ifndef _testpkg_const 56# #define _testpkg_const _const 57# #endif 58# 59# and this "mylib/_config.h" can be installed along with other 60# header-files, which is most convenient when creating a shared library 61# (that has some headers) where some functionality is dependent on the 62# OS-features detected at compile-time. No need to invent some 63# "mylib-confdefs.h.in" manually. :-) 64# 65# Note that some AC_DEFINEs that end up in the config.h file are actually 66# self-referential - e.g. AC_C_INLINE, AC_C_CONST, and the AC_TYPE_OFF_T 67# say that they "will define inline|const|off_t if the system does not do 68# it by itself". You might want to clean up about these - consider an 69# extra mylib/conf.h that reads something like: 70# 71# #include <mylib/_config.h> 72# #ifndef _testpkg_const 73# #define _testpkg_const const 74# #endif 75# 76# and then start using _testpkg_const in the header files. That is also a 77# good thing to differentiate whether some library-user has starting to 78# take up with a different compiler, so perhaps it could read something 79# like this: 80# 81# #ifdef _MSC_VER 82# #include <mylib/_msvc.h> 83# #else 84# #include <mylib/_config.h> 85# #endif 86# #ifndef _testpkg_const 87# #define _testpkg_const const 88# #endif 89# 90# LAST MODIFICATION 91# 92# 2008-04-12 93# 94# COPYLEFT 95# 96# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> 97# Copyright (c) 2008 Marten Svantesson 98# Copyright (c) 2008 Gerald Point <Gerald.Point@labri.fr> 99# 100# This program is free software; you can redistribute it and/or modify it 101# under the terms of the GNU General Public License as published by the 102# Free Software Foundation; either version 2 of the License, or (at your 103# option) any later version. 104# 105# This program is distributed in the hope that it will be useful, but 106# WITHOUT ANY WARRANTY; without even the implied warranty of 107# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 108# Public License for more details. 109# 110# You should have received a copy of the GNU General Public License along 111# with this program. If not, see <http://www.gnu.org/licenses/>. 112# 113# As a special exception, the respective Autoconf Macro's copyright owner 114# gives unlimited permission to copy, distribute and modify the configure 115# scripts that are the output of Autoconf when processing the Macro. You 116# need not follow the terms of the GNU General Public License when using 117# or distributing such scripts, even though portions of the text of the 118# Macro appear in them. The GNU General Public License (GPL) does govern 119# all other use of the material that constitutes the Autoconf Macro. 120# 121# This special exception to the GPL applies to versions of the Autoconf 122# Macro released by the Autoconf Macro Archive. When you make and 123# distribute a modified version of the Autoconf Macro, you may extend this 124# special exception to the GPL to apply to your modified version as well. 125 126AC_DEFUN([AX_PREFIX_CONFIG_H],[dnl 127AC_BEFORE([AC_CONFIG_HEADERS],[$0])dnl 128AC_CONFIG_COMMANDS([ifelse($1,,$PACKAGE-config.h,$1)],[dnl 129AS_VAR_PUSHDEF([_OUT],[ac_prefix_conf_OUT])dnl 130AS_VAR_PUSHDEF([_DEF],[ac_prefix_conf_DEF])dnl 131AS_VAR_PUSHDEF([_PKG],[ac_prefix_conf_PKG])dnl 132AS_VAR_PUSHDEF([_LOW],[ac_prefix_conf_LOW])dnl 133AS_VAR_PUSHDEF([_UPP],[ac_prefix_conf_UPP])dnl 134AS_VAR_PUSHDEF([_INP],[ac_prefix_conf_INP])dnl 135m4_pushdef([_script],[conftest.prefix])dnl 136m4_pushdef([_symbol],[m4_cr_Letters[]m4_cr_digits[]_])dnl 137_OUT=`echo ifelse($1, , $PACKAGE-config.h, $1)` 138_DEF=`echo _$_OUT | sed -e "y:m4_cr_letters:m4_cr_LETTERS[]:" -e "s/@<:@^m4_cr_Letters@:>@/_/g"` 139_PKG=`echo ifelse($2, , $PACKAGE, $2)` 140_LOW=`echo _$_PKG | sed -e "y:m4_cr_LETTERS-:m4_cr_letters[]_:"` 141_UPP=`echo $_PKG | sed -e "y:m4_cr_letters-:m4_cr_LETTERS[]_:" -e "/^@<:@m4_cr_digits@:>@/s/^/_/"` 142_INP=`echo "ifelse($3,,,$3)" | sed -e 's/ *//'` 143if test ".$_INP" = "."; then 144 for ac_file in : $CONFIG_HEADERS; do test "_$ac_file" = _: && continue 145 case "$ac_file" in 146 *.h) _INP=$ac_file ;; 147 *) 148 esac 149 test ".$_INP" != "." && break 150 done 151fi 152if test ".$_INP" = "."; then 153 case "$_OUT" in 154 */*) _INP=`basename "$_OUT"` 155 ;; 156 *-*) _INP=`echo "$_OUT" | sed -e "s/@<:@_symbol@:>@*-//"` 157 ;; 158 *) _INP=config.h 159 ;; 160 esac 161fi 162if test -z "$_PKG" ; then 163 AC_MSG_ERROR([no prefix for _PREFIX_PKG_CONFIG_H]) 164else 165 if test ! -f "$_INP" ; then if test -f "$srcdir/$_INP" ; then 166 _INP="$srcdir/$_INP" 167 fi fi 168 AC_MSG_NOTICE(creating $_OUT - prefix $_UPP for $_INP defines) 169 if test -f $_INP ; then 170 echo "s/^@%:@undef *\\(@<:@m4_cr_LETTERS[]_@:>@\\)/@%:@undef $_UPP""_\\1/" > _script 171 echo "s/^@%:@undef *\\(@<:@m4_cr_letters@:>@\\)/@%:@undef $_LOW""_\\1/" >> _script 172 echo "s/^@%:@def[]ine *\\(@<:@m4_cr_LETTERS[]_@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_UPP""_\\1 \\" >> _script 173 echo "@%:@def[]ine $_UPP""_\\1 \\2 \\" >> _script 174 echo "@%:@endif/" >>_script 175 echo "s/^@%:@def[]ine *\\(@<:@m4_cr_letters@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_LOW""_\\1 \\" >> _script 176 echo "@%:@define $_LOW""_\\1 \\2 \\" >> _script 177 echo "@%:@endif/" >> _script 178 # now executing _script on _DEF input to create _OUT output file 179 echo "@%:@ifndef $_DEF" >$tmp/pconfig.h 180 echo "@%:@def[]ine $_DEF 1" >>$tmp/pconfig.h 181 echo ' ' >>$tmp/pconfig.h 182 echo /'*' $_OUT. Generated automatically at end of configure. '*'/ >>$tmp/pconfig.h 183 184 sed -f _script $_INP >>$tmp/pconfig.h 185 echo ' ' >>$tmp/pconfig.h 186 echo '/* once:' $_DEF '*/' >>$tmp/pconfig.h 187 echo "@%:@endif" >>$tmp/pconfig.h 188 if cmp -s $_OUT $tmp/pconfig.h 2>/dev/null; then 189 AC_MSG_NOTICE([$_OUT is unchanged]) 190 else 191 ac_dir=`AS_DIRNAME(["$_OUT"])` 192 AS_MKDIR_P(["$ac_dir"]) 193 rm -f "$_OUT" 194 mv $tmp/pconfig.h "$_OUT" 195 fi 196 cp _script _configs.sed 197 else 198 AC_MSG_ERROR([input file $_INP does not exist - skip generating $_OUT]) 199 fi 200 rm -f conftest.* 201fi 202m4_popdef([_symbol])dnl 203m4_popdef([_script])dnl 204AS_VAR_POPDEF([_INP])dnl 205AS_VAR_POPDEF([_UPP])dnl 206AS_VAR_POPDEF([_LOW])dnl 207AS_VAR_POPDEF([_PKG])dnl 208AS_VAR_POPDEF([_DEF])dnl 209AS_VAR_POPDEF([_OUT])dnl 210],[PACKAGE="$PACKAGE"])]) 211 212dnl implementation note: a bug report (31.5.2005) from Marten Svantesson points 213dnl out a problem where `echo "\1"` results in a Control-A. The unix standard 214dnl http://www.opengroup.org/onlinepubs/000095399/utilities/echo.html 215dnl defines all backslash-sequences to be inherently non-portable asking 216dnl for replacement mit printf. Some old systems had problems with that 217dnl one either. However, the latest libtool (!) release does export an $ECHO 218dnl (and $echo) that does the right thing - just one question is left: what 219dnl was the first version to have it? Is it greater 2.58 ? 220