# =========================================================================== # http://www.gnu.org/software/autoconf-archive/ax_prefix_config_h.html # =========================================================================== # # SYNOPSIS # # AX_PREFIX_CONFIG_H [(OUTPUT-HEADER [,PREFIX [,ORIG-HEADER]])] # # DESCRIPTION # # Generate an installable config.h. # # A package should not normally install its config.h as a system header, # but if it must, this macro can be used to avoid namespace pollution by # making a copy of config.h with a prefix added to all the macro names. # # Each "#define SOMEDEF" line of the configuration header has the given # prefix added, in the same case as the first character of the macro name. # # Defaults: # # OUTPUT-HEADER = $PACKAGE-config.h # PREFIX = $PACKAGE # ORIG-HEADER, from AM_CONFIG_HEADER(config.h) # # Your configure.ac script should contain both macros in this order. # # Example: # # 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 # # If the argument to AX_PREFIX_CONFIG_H would have been omitted then the # default output file would have been called simply "testpkg-config.h", # but even under the name "mylib/_config.h" it contains prefix-defines # like # # #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 # # 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) whose functionality depends on features detected at # compile-time. No need to invent some "mylib-confdefs.h.in" manually. # # 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: # # #include # #ifndef _testpkg_const # #define _testpkg_const const # #endif # # 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: # # #ifdef _MSC_VER # #include # #else # #include # #endif # #ifndef _testpkg_const # #define _testpkg_const const # #endif # # LICENSE # # Copyright (c) 2014 Reuben Thomas # Copyright (c) 2008 Guido U. Draheim # Copyright (c) 2008 Marten Svantesson # Copyright (c) 2008 Gerald Point # # This program is free software; you can redistribute it and/or modify it # under the terms of the GNU General Public License as published by the # Free Software Foundation; either version 3 of the License, or (at your # option) any later version. # # This program is distributed in the hope that it will be useful, but # WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General # Public License for more details. # # You should have received a copy of the GNU General Public License along # with this program. If not, see . # # As a special exception, the respective Autoconf Macro's copyright owner # gives unlimited permission to copy, distribute and modify the configure # scripts that are the output of Autoconf when processing the Macro. You # need not follow the terms of the GNU General Public License when using # or distributing such scripts, even though portions of the text of the # Macro appear in them. The GNU General Public License (GPL) does govern # all other use of the material that constitutes the Autoconf Macro. # # This special exception to the GPL applies to versions of the Autoconf # Macro released by the Autoconf Archive. When you make and distribute a # modified version of the Autoconf Macro, you may extend this special # exception to the GPL to apply to your modified version as well. #serial 15 AC_DEFUN([AX_PREFIX_CONFIG_H],[dnl AC_PREREQ([2.62]) AC_BEFORE([AC_CONFIG_HEADERS],[$0])dnl AC_CONFIG_COMMANDS(m4_default([$1], [$PACKAGE-config.h]),[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=`echo m4_default([$1], [$PACKAGE-config.h])` _DEF=`echo _$_OUT | sed -e "y:m4_cr_letters:m4_cr_LETTERS[]:" -e "s/@<:@^m4_cr_Letters@:>@/_/g"` _PKG=`echo m4_default([$2], [$PACKAGE])` _LOW=`echo _$_PKG | sed -e "y:m4_cr_LETTERS-:m4_cr_letters[]_:"` _UPP=`echo $_PKG | sed -e "y:m4_cr_letters-:m4_cr_LETTERS[]_:" -e "/^@<:@m4_cr_digits@:>@/s/^/_/"` _INP=`echo "$3" | sed -e 's/ *//'` if test ".$_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=`echo "$_OUT" | sed -e "s/@<:@_symbol@:>@*-//"` ;; *) _INP=config.h ;; esac fi if test -z "$_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 AS_ECHO(["s/^@%:@undef *\\(@<:@m4_cr_LETTERS[]_@:>@\\)/@%:@undef $_UPP""_\\1/"]) > _script AS_ECHO(["s/^@%:@undef *\\(@<:@m4_cr_letters@:>@\\)/@%:@undef $_LOW""_\\1/"]) >> _script AS_ECHO(["s/^@%:@def[]ine *\\(@<:@m4_cr_LETTERS[]_@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_UPP""_\\1\\"]) >> _script AS_ECHO(["@%:@def[]ine $_UPP""_\\1\\2\\"]) >> _script AS_ECHO(["@%:@endif/"]) >> _script AS_ECHO(["s/^@%:@def[]ine *\\(@<:@m4_cr_letters@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_LOW""_\\1\\"]) >> _script AS_ECHO(["@%:@define $_LOW""_\\1\\2\\"]) >> _script AS_ECHO(["@%:@endif/"]) >> _script # now executing _script on _DEF input to create _OUT output file echo "@%:@ifndef $_DEF" >$tmp/pconfig.h echo "@%:@def[]ine $_DEF 1" >>$tmp/pconfig.h echo ' ' >>$tmp/pconfig.h echo /'*' $_OUT. Generated automatically at end of configure. '*'/ >>$tmp/pconfig.h sed -f _script $_INP >>$tmp/pconfig.h echo ' ' >>$tmp/pconfig.h echo '/* once:' $_DEF '*/' >>$tmp/pconfig.h echo "@%:@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 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"])])