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|
dnl @synopsis AX_PREFIX_CONFIG_H [(OUTPUT-HEADER [,PREFIX [,ORIG-HEADER]])]
dnl
dnl This is a new variant from ac_prefix_config_ this one will use a
dnl lowercase-prefix if the config-define was starting with a
dnl lowercase-char, e.g. "#define const", "#define restrict", or
dnl "#define off_t", (and this one can live in another directory, e.g.
dnl testpkg/config.h therefore I decided to move the output-header to
dnl be the first arg)
dnl
dnl takes the usual config.h generated header file; looks for each of
dnl the generated "#define SOMEDEF" lines, and prefixes the defined
dnl name (ie. makes it "#define PREFIX_SOMEDEF". The result is written
dnl to the output config.header file. The PREFIX is converted to
dnl uppercase for the conversions.
dnl
dnl Defaults:
dnl
dnl OUTPUT-HEADER = $PACKAGE-config.h
dnl PREFIX = $PACKAGE
dnl ORIG-HEADER, from AM_CONFIG_HEADER(config.h)
dnl
dnl Your configure.ac script should contain both macros in this order,
dnl and unlike the earlier variations of this prefix-macro it is okay
dnl to place the AX_PREFIX_CONFIG_H call before the AC_OUTPUT
dnl invokation.
dnl
dnl Example:
dnl
dnl AC_INIT(config.h.in) # config.h.in as created by "autoheader"
dnl AM_INIT_AUTOMAKE(testpkg, 0.1.1) # makes #undef VERSION and PACKAGE
dnl AM_CONFIG_HEADER(config.h) # prep config.h from config.h.in
dnl AX_PREFIX_CONFIG_H(mylib/_config.h) # prep mylib/_config.h from it..
dnl AC_MEMORY_H # makes "#undef NEED_MEMORY_H"
dnl AC_C_CONST_H # makes "#undef const"
dnl AC_OUTPUT(Makefile) # creates the "config.h" now
dnl # and also mylib/_config.h
dnl
dnl if the argument to AX_PREFIX_CONFIG_H would have been omitted then
dnl the default outputfile would have been called simply
dnl "testpkg-config.h", but even under the name "mylib/_config.h" it
dnl contains prefix-defines like
dnl
dnl #ifndef TESTPKG_VERSION
dnl #define TESTPKG_VERSION "0.1.1"
dnl #endif
dnl #ifndef TESTPKG_NEED_MEMORY_H
dnl #define TESTPKG_NEED_MEMORY_H 1
dnl #endif
dnl #ifndef _testpkg_const
dnl #define _testpkg_const _const
dnl #endif
dnl
dnl and this "mylib/_config.h" can be installed along with other
dnl header-files, which is most convenient when creating a shared
dnl library (that has some headers) where some functionality is
dnl dependent on the OS-features detected at compile-time. No need to
dnl invent some "mylib-confdefs.h.in" manually. :-)
dnl
dnl Note that some AC_DEFINEs that end up in the config.h file are
dnl actually self-referential - e.g. AC_C_INLINE, AC_C_CONST, and the
dnl AC_TYPE_OFF_T say that they "will define inline|const|off_t if the
dnl system does not do it by itself". You might want to clean up about
dnl these - consider an extra mylib/conf.h that reads something like:
dnl
dnl #include <mylib/_config.h>
dnl #ifndef _testpkg_const
dnl #define _testpkg_const const
dnl #endif
dnl
dnl and then start using _testpkg_const in the header files. That is
dnl also a good thing to differentiate whether some library-user has
dnl starting to take up with a different compiler, so perhaps it could
dnl read something like this:
dnl
dnl #ifdef _MSC_VER
dnl #include <mylib/_msvc.h>
dnl #else
dnl #include <mylib/_config.h>
dnl #endif
dnl #ifndef _testpkg_const
dnl #define _testpkg_const const
dnl #endif
dnl
dnl @category Misc
dnl @author Guido U. Draheim <guidod@gmx.de>
dnl @version 2003-07-03
dnl @license GPLWithACException
AC_DEFUN([AX_PREFIX_CONFIG_H],[dnl
AC_CONFIG_COMMANDS([ifelse($1,,$PACKAGE-config.h,$1)],[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 ifelse($1, , $PACKAGE-config.h, $1)`
_DEF=`echo _$_OUT | sed -e "y:m4_cr_letters:m4_cr_LETTERS[]:" -e "s/@<:@^m4_cr_Letters@:>@/_/g"`
_PKG=`echo ifelse($2, , $PACKAGE, $2)`
_LOW=`echo _$_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 "ifelse($3,,,$3)" | sed -e 's/ *//'`
if test ".$_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
echo "s/^@%:@undef *\\(@<:@m4_cr_LETTERS[]_@:>@\\)/@%:@undef $_UPP""_\\1/" > _script
echo "s/^@%:@undef *\\(@<:@m4_cr_letters@:>@\\)/@%:@undef $_LOW""_\\1/" >> _script
echo "s/^@%:@def[]ine *\\(@<:@m4_cr_LETTERS[]_@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_UPP""_\\1 \\" >> _script
echo "@%:@def[]ine $_UPP""_\\1 \\2 \\" >> _script
echo "@%:@endif/" >>_script
echo "s/^@%:@def[]ine *\\(@<:@m4_cr_letters@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_LOW""_\\1 \\" >> _script
echo "@%:@define $_LOW""_\\1 \\2 \\" >> _script
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
cp _script _configs.sed
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"])])
dnl implementation note: a bug report (31.5.2005) from Marten Svantesson points
dnl out a problem where `echo "\1"` results in a Control-A. The unix standard
dnl http://www.opengroup.org/onlinepubs/000095399/utilities/echo.html
dnl defines all backslash-sequences to be inherently non-portable asking
dnl for replacement mit printf. Some old systems had problems with that
dnl one either. However, the latest libtool (!) release does export an $ECHO
dnl (and $echo) that does the right thing - just one question is left: what
dnl was the first version to have it? Is it greater 2.58 ?
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