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168 lines
6.6 KiB
168 lines
6.6 KiB
dnl @synopsis AX_PREFIX_CONFIG_H [(OUTPUT-HEADER [,PREFIX [,ORIG-HEADER]])]
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dnl
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dnl This is a new variant from ac_prefix_config_ this one will use a
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dnl lowercase-prefix if the config-define was starting with a
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dnl lowercase-char, e.g. "#define const", "#define restrict", or
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dnl "#define off_t", (and this one can live in another directory, e.g.
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dnl testpkg/config.h therefore I decided to move the output-header to
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dnl be the first arg)
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dnl
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dnl takes the usual config.h generated header file; looks for each of
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dnl the generated "#define SOMEDEF" lines, and prefixes the defined name
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dnl (ie. makes it "#define PREFIX_SOMEDEF". The result is written to
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dnl the output config.header file. The PREFIX is converted to uppercase
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dnl for the conversions.
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dnl
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dnl Defaults:
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dnl
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dnl OUTPUT-HEADER = $PACKAGE-config.h
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dnl PREFIX = $PACKAGE
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dnl ORIG-HEADER, from AM_CONFIG_HEADER(config.h)
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dnl
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dnl Your configure.ac script should contain both macros in this order,
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dnl and unlike the earlier variations of this prefix-macro it is okay to
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dnl place the AX_PREFIX_CONFIG_H call before the AC_OUTPUT invokation.
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dnl
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dnl Example:
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dnl
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dnl AC_INIT(config.h.in) # config.h.in as created by "autoheader"
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dnl AM_INIT_AUTOMAKE(testpkg, 0.1.1) # makes #undef VERSION and PACKAGE
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dnl AM_CONFIG_HEADER(config.h) # prep config.h from config.h.in
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dnl AX_PREFIX_CONFIG_H(mylib/_config.h) # prep mylib/_config.h from it..
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dnl AC_MEMORY_H # makes "#undef NEED_MEMORY_H"
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dnl AC_C_CONST_H # makes "#undef const"
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dnl AC_OUTPUT(Makefile) # creates the "config.h" now
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dnl # and also mylib/_config.h
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dnl
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dnl if the argument to AX_PREFIX_CONFIG_H would have been omitted then the
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dnl default outputfile would have been called simply "testpkg-config.h", but
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dnl even under the name "mylib/_config.h" it contains prefix-defines like
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dnl
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dnl #ifndef TESTPKG_VERSION
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dnl #define TESTPKG_VERSION "0.1.1"
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dnl #endif
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dnl #ifndef TESTPKG_NEED_MEMORY_H
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dnl #define TESTPKG_NEED_MEMORY_H 1
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dnl #endif
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dnl #ifndef _testpkg_const
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dnl #define _testpkg_const _const
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dnl #endif
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dnl
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dnl and this "mylib/_config.h" can be installed along with other
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dnl header-files, which is most convenient when creating a shared
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dnl library (that has some headers) where some functionality is
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dnl dependent on the OS-features detected at compile-time. No
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dnl need to invent some "mylib-confdefs.h.in" manually. :-)
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dnl
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dnl Note that some AC_DEFINEs that end up in the config.h file are
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dnl actually self-referential - e.g. AC_C_INLINE, AC_C_CONST, and the
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dnl AC_TYPE_OFF_T say that they "will define inline|const|off_t if the
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dnl system does not do it by itself". You might want to clean up about
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dnl these - consider an extra mylib/conf.h that reads something like:
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dnl
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dnl #include <mylib/_config.h>
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dnl #ifndef _testpkg_const
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dnl #define _testpkg_const const
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dnl #endif
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dnl
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dnl and then start using _testpkg_const in the header files. That is
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dnl also a good thing to differentiate whether some library-user has
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dnl starting to take up with a different compiler, so perhaps it could
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dnl read something like this:
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dnl
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dnl #ifdef _MSC_VER
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dnl #include <mylib/_msvc.h>
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dnl #else
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dnl #include <mylib/_config.h>
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dnl #endif
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dnl #ifndef _testpkg_const
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dnl #define _testpkg_const const
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dnl #endif
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dnl
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dnl @version $Id: ax_prefix_config_h.m4 1867 2005-01-27 14:04:04Z pommier $
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dnl @author Guiodo Draheim <guidod@gmx.de>
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dnl
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AC_DEFUN([AX_PREFIX_CONFIG_H],[AC_REQUIRE([AC_CONFIG_HEADER])
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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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case "$ac_file" in
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*.h) _INP=$ac_file ;;
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*)
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esac
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test ".$_INP" != "." && break
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done
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fi
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if test ".$_INP" = "."; then
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case "$_OUT" in
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*/*) _INP=`basename "$_OUT"`
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;;
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*-*) _INP=`echo "$_OUT" | sed -e "s/@<:@_symbol@:>@*-//"`
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;;
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*) _INP=config.h
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;;
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esac
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fi
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if test -z "$_PKG" ; then
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AC_MSG_ERROR([no prefix for _PREFIX_PKG_CONFIG_H])
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else
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if test ! -f "$_INP" ; then if test -f "$srcdir/$_INP" ; then
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_INP="$srcdir/$_INP"
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fi fi
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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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else
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ac_dir=`AS_DIRNAME(["$_OUT"])`
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AS_MKDIR_P(["$ac_dir"])
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rm -f "$_OUT"
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mv $tmp/pconfig.h "$_OUT"
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fi
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cp _script _configs.sed
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else
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AC_MSG_ERROR([input file $_INP does not exist - skip generating $_OUT])
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fi
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rm -f conftest.*
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fi
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m4_popdef([_symbol])dnl
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m4_popdef([_script])dnl
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AS_VAR_POPDEF([_INP])dnl
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AS_VAR_POPDEF([_UPP])dnl
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AS_VAR_POPDEF([_LOW])dnl
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AS_VAR_POPDEF([_PKG])dnl
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AS_VAR_POPDEF([_DEF])dnl
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AS_VAR_POPDEF([_OUT])dnl
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],[PACKAGE="$PACKAGE"])])
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