1# =========================================================================== 2# https://www.gnu.org/software/autoconf-archive/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# Generate an installable config.h. 12# 13# A package should not normally install its config.h as a system header, 14# but if it must, this macro can be used to avoid namespace pollution by 15# making a copy of config.h with a prefix added to all the macro names. 16# 17# Each "#define SOMEDEF" line of the configuration header has the given 18# prefix added, in the same case as the first character of the macro name. 19# 20# Defaults: 21# 22# OUTPUT-HEADER = $PACKAGE-config.h 23# PREFIX = $PACKAGE 24# ORIG-HEADER, from AM_CONFIG_HEADER(config.h) 25# 26# Your configure.ac script should contain both macros in this order. 27# 28# Example: 29# 30# AC_INIT(config.h.in) # config.h.in as created by "autoheader" 31# AM_INIT_AUTOMAKE(testpkg, 0.1.1) # makes #undef VERSION and PACKAGE 32# AM_CONFIG_HEADER(config.h) # prep config.h from config.h.in 33# AX_PREFIX_CONFIG_H(mylib/_config.h) # prep mylib/_config.h from it.. 34# AC_MEMORY_H # makes "#undef NEED_MEMORY_H" 35# AC_C_CONST_H # makes "#undef const" 36# AC_OUTPUT(Makefile) # creates the "config.h" now 37# # and also mylib/_config.h 38# 39# If the argument to AX_PREFIX_CONFIG_H would have been omitted then the 40# default output file would have been called simply "testpkg-config.h", 41# but even under the name "mylib/_config.h" it contains prefix-defines 42# like 43# 44# #ifndef TESTPKG_VERSION 45# #define TESTPKG_VERSION "0.1.1" 46# #endif 47# #ifndef TESTPKG_NEED_MEMORY_H 48# #define TESTPKG_NEED_MEMORY_H 1 49# #endif 50# #ifndef _testpkg_const 51# #define _testpkg_const _const 52# #endif 53# 54# and this "mylib/_config.h" can be installed along with other header 55# files, which is most convenient when creating a shared library (that has 56# some headers) whose functionality depends on features detected at 57# compile-time. No need to invent some "mylib-confdefs.h.in" manually. 58# 59# Note that some AC_DEFINEs that end up in the config.h file are actually 60# self-referential - e.g. AC_C_INLINE, AC_C_CONST, and the AC_TYPE_OFF_T 61# say that they "will define inline|const|off_t if the system does not do 62# it by itself". You might want to clean up about these - consider an 63# extra mylib/conf.h that reads something like: 64# 65# #include <mylib/_config.h> 66# #ifndef _testpkg_const 67# #define _testpkg_const const 68# #endif 69# 70# and then start using _testpkg_const in the header files. That is also a 71# good thing to differentiate whether some library-user has starting to 72# take up with a different compiler, so perhaps it could read something 73# like this: 74# 75# #ifdef _MSC_VER 76# #include <mylib/_msvc.h> 77# #else 78# #include <mylib/_config.h> 79# #endif 80# #ifndef _testpkg_const 81# #define _testpkg_const const 82# #endif 83# 84# LICENSE 85# 86# Copyright (c) 2014 Reuben Thomas <rrt@sc3d.org> 87# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> 88# Copyright (c) 2008 Marten Svantesson 89# Copyright (c) 2008 Gerald Point <Gerald.Point@labri.fr> 90# 91# This program is free software; you can redistribute it and/or modify it 92# under the terms of the GNU General Public License as published by the 93# Free Software Foundation; either version 3 of the License, or (at your 94# option) any later version. 95# 96# This program is distributed in the hope that it will be useful, but 97# WITHOUT ANY WARRANTY; without even the implied warranty of 98# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 99# Public License for more details. 100# 101# You should have received a copy of the GNU General Public License along 102# with this program. If not, see <https://www.gnu.org/licenses/>. 103# 104# As a special exception, the respective Autoconf Macro's copyright owner 105# gives unlimited permission to copy, distribute and modify the configure 106# scripts that are the output of Autoconf when processing the Macro. You 107# need not follow the terms of the GNU General Public License when using 108# or distributing such scripts, even though portions of the text of the 109# Macro appear in them. The GNU General Public License (GPL) does govern 110# all other use of the material that constitutes the Autoconf Macro. 111# 112# This special exception to the GPL applies to versions of the Autoconf 113# Macro released by the Autoconf Archive. When you make and distribute a 114# modified version of the Autoconf Macro, you may extend this special 115# exception to the GPL to apply to your modified version as well. 116 117#serial 16 118 119AC_DEFUN([AX_PREFIX_CONFIG_H],[dnl 120AC_PREREQ([2.62]) 121AC_BEFORE([AC_CONFIG_HEADERS],[$0])dnl 122AC_CONFIG_COMMANDS(m4_default([$1], [$PACKAGE-config.h]),[dnl 123AS_VAR_PUSHDEF([_OUT],[ac_prefix_conf_OUT])dnl 124AS_VAR_PUSHDEF([_DEF],[ac_prefix_conf_DEF])dnl 125AS_VAR_PUSHDEF([_PKG],[ac_prefix_conf_PKG])dnl 126AS_VAR_PUSHDEF([_LOW],[ac_prefix_conf_LOW])dnl 127AS_VAR_PUSHDEF([_UPP],[ac_prefix_conf_UPP])dnl 128AS_VAR_PUSHDEF([_INP],[ac_prefix_conf_INP])dnl 129m4_pushdef([_script],[conftest.prefix])dnl 130m4_pushdef([_symbol],[m4_cr_Letters[]m4_cr_digits[]_])dnl 131_OUT=`echo m4_default([$1], [$PACKAGE-config.h])` 132_DEF=`echo _$_OUT | sed -e "y:m4_cr_letters:m4_cr_LETTERS[]:" -e "s/@<:@^m4_cr_Letters@:>@/_/g"` 133_PKG=`echo m4_default([$2], [$PACKAGE])` 134_LOW=`echo _$_PKG | sed -e "y:m4_cr_LETTERS-:m4_cr_letters[]_:"` 135_UPP=`echo $_PKG | sed -e "y:m4_cr_letters-:m4_cr_LETTERS[]_:" -e "/^@<:@m4_cr_digits@:>@/s/^/_/"` 136_INP=`echo "$3" | sed -e 's/ *//'` 137if test ".$_INP" = "."; then 138 for ac_file in : $CONFIG_HEADERS; do test "_$ac_file" = _: && continue 139 case "$ac_file" in 140 *.h) _INP=$ac_file ;; 141 *) 142 esac 143 test ".$_INP" != "." && break 144 done 145fi 146if test ".$_INP" = "."; then 147 case "$_OUT" in 148 */*) _INP=`basename "$_OUT"` 149 ;; 150 *-*) _INP=`echo "$_OUT" | sed -e "s/@<:@_symbol@:>@*-//"` 151 ;; 152 *) _INP=config.h 153 ;; 154 esac 155fi 156if test -z "$_PKG" ; then 157 AC_MSG_ERROR([no prefix for _PREFIX_PKG_CONFIG_H]) 158else 159 if test ! -f "$_INP" ; then if test -f "$srcdir/$_INP" ; then 160 _INP="$srcdir/$_INP" 161 fi fi 162 AC_MSG_NOTICE(creating $_OUT - prefix $_UPP for $_INP defines) 163 if test -f $_INP ; then 164 AS_ECHO(["s/^@%:@undef *\\(@<:@m4_cr_LETTERS[]_@:>@\\)/@%:@undef $_UPP""_\\1/"]) > _script 165 AS_ECHO(["s/^@%:@undef *\\(@<:@m4_cr_letters@:>@\\)/@%:@undef $_LOW""_\\1/"]) >> _script 166 AS_ECHO(["s/^@%:@def[]ine *\\(@<:@m4_cr_LETTERS[]_@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_UPP""_\\1\\"]) >> _script 167 AS_ECHO(["@%:@def[]ine $_UPP""_\\1\\2\\"]) >> _script 168 AS_ECHO(["@%:@endif/"]) >> _script 169 AS_ECHO(["s/^@%:@def[]ine *\\(@<:@m4_cr_letters@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_LOW""_\\1\\"]) >> _script 170 AS_ECHO(["@%:@define $_LOW""_\\1\\2\\"]) >> _script 171 AS_ECHO(["@%:@endif/"]) >> _script 172 # now executing _script on _DEF input to create _OUT output file 173 echo "@%:@ifndef $_DEF" >$tmp/pconfig.h 174 echo "@%:@def[]ine $_DEF 1" >>$tmp/pconfig.h 175 echo ' ' >>$tmp/pconfig.h 176 echo /'*' $_OUT. Generated automatically at end of configure. '*'/ >>$tmp/pconfig.h 177 178 sed -f _script $_INP >>$tmp/pconfig.h 179 echo ' ' >>$tmp/pconfig.h 180 echo '/* once:' $_DEF '*/' >>$tmp/pconfig.h 181 echo "@%:@endif" >>$tmp/pconfig.h 182 if cmp -s $_OUT $tmp/pconfig.h 2>/dev/null; then 183 AC_MSG_NOTICE([$_OUT is unchanged]) 184 else 185 ac_dir=`AS_DIRNAME(["$_OUT"])` 186 AS_MKDIR_P(["$ac_dir"]) 187 rm -f "$_OUT" 188 mv $tmp/pconfig.h "$_OUT" 189 fi 190 else 191 AC_MSG_ERROR([input file $_INP does not exist - skip generating $_OUT]) 192 fi 193 rm -f conftest.* 194fi 195m4_popdef([_symbol])dnl 196m4_popdef([_script])dnl 197AS_VAR_POPDEF([_INP])dnl 198AS_VAR_POPDEF([_UPP])dnl 199AS_VAR_POPDEF([_LOW])dnl 200AS_VAR_POPDEF([_PKG])dnl 201AS_VAR_POPDEF([_DEF])dnl 202AS_VAR_POPDEF([_OUT])dnl 203],[PACKAGE="$PACKAGE"])]) 204