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Diffstat (limited to 'm4/triplet-transformation.m4')
| -rw-r--r-- | m4/triplet-transformation.m4 | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/m4/triplet-transformation.m4 b/m4/triplet-transformation.m4 new file mode 100644 index 00000000..fa9655a3 --- /dev/null +++ b/m4/triplet-transformation.m4 @@ -0,0 +1,121 @@ +dnl +dnl _AX_TRIPLET_TRANSFORMATION(SYSTEM-TYPE, SED-SCRIPT [, HEADER]) +dnl with +dnl SYSTEM-TYPE : `build', `host' or `target' +dnl SED-SCRIPT : valid sed script transforming the triplet in +dnl variable `ac_cv_<SYSTEM-TYPE>' +dnl HEADER : message header printed when triplet conversion +dnl is applied +dnl +dnl Read the triplet from the cache variable `ac_cv_<SYSTEM-TYPE>', +dnl try to transform it using the sed script SED-SCRIPT. If the +dnl transformation results in a change +dnl - backup the original triplet in the cache variable +dnl `<PROGRAM>_cv_<SYSTEM-TYPE>_orig' +dnl - save the transformed one in `ac_cv_<SYSTEM-TYPE>' +dnl - update the variables `<SYSTEM-TYPE>-(os|cpu|vendor)' (which is the +dnl ultimate goal of this macro). +dnl +AC_DEFUN([_AX_TRIPLET_TRANSFORMATION], +[AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl +AC_REQUIRE_AUX_FILE([config.sub])dnl +dnl This part should appear in the configure script AFTER the block +dnl handling the original sytem-type variables build/host/target. +AS_VAR_PUSHDEF([ax_triplet_orig],[]AC_PACKAGE_TARNAME[_cv_$1_orig]) +dnl The real configure variable `ac_cv_target' might be void. +if test x$ac_cv_$1 != x; then +dnl here the transformation happens. + ax_tt_var=`echo $ac_cv_$1 | sed '$2'` + if test x$ax_tt_var = x; then + AC_MSG_NOTICE([sed script: $1 triplet conversion `$ac_cv_$1' with sed script `$2'failed.]) +dnl test if transformed triplet is known to config.sub, hence probably to most of the autotools. + elif test x$ax_tt_var != x`$SHELL "$ac_aux_dir/config.sub" $ax_tt_var`; then + AC_MSG_NOTICE([`config.sub' test: $1 triplet conversion of `$ac_cv_$1' produced invalid triplet `$ax_tt_var'.]) +dnl did anything change at all? + elif test x$ax_tt_var != x$ac_cv_$1; then +dnl print the header just once in one configure script + m4_ifnblank([$3],[dnl + if test x$ax_tt_header_is_printed != xyes; then + ax_tt_header_is_printed=yes + AC_MSG_NOTICE([$3]) + fi]) + ax_triplet_orig=$ac_cv_$1 + ac_cv_$1=$ax_tt_var + AC_MSG_NOTICE([$1: replacing $ax_triplet_orig -> $ac_cv_$1]) +dnl Better neutralize ax_tt_var because we call another macro whic might use this +dnl variable, too. + ax_tt_var= +dnl use of autoconf internal: rerun the triplet split cpu/vendor/host + _AC_CANONICAL_SPLIT([$1]) + fi + ax_tt_var= +fi +AS_VAR_POPDEF([ax_triplet_orig])dnl +])dnl _AX_TRIPLET_TRANSFORMATION + +dnl +dnl AX_CANONICAL_HOST(PLATFORM-PATTERN, SED-SCRIPT [, TITLE]) +dnl +dnl If UNAME matches PLATFORM-PATTERN convert the build and/or host triplets +dnl using SED-SCRIPT. Have configure emit a message if a transformation +dnl occurs. +dnl +dnl This macro works __inside__ configure as if it was called like so on the +dnl command line: +dnl +dnl #! /usr/bin/bash +dnl case $(uname) in +dnl <PLATFORM-PATTERN>) +dnl test -z $mytriplet && mytriplet=$(./config.sub $(./config.guess)) +dnl ./configure --host=$(echo $mytriplet | sed '<SED-SCRIPT>') +dnl ;; +dnl *) ./configure +dnl esac +dnl +dnl The macro calls implicitly AC_CANONICAL_HOST. +dnl +dnl To bypass the macro call such that it should not have any effect +dnl on the configure run pass the NON-VOID variable `ax_disable_triplet_transform' +dnl to configure. E.g., +dnl +dnl ./configure ax_disable_triplet_transform=yes +dnl +dnl In this case it defaults to calling `AC_CANONICAL_HOST'. +dnl +AC_DEFUN_ONCE([AX_CANONICAL_HOST], +[AC_BEFORE([$0],[AC_CANONICAL_BUILD])dnl +AC_BEFORE([$0],[AC_CANONICAL_HOST])dnl +ax_tt_header_is_printed=: +dnl skip case statement if ax_disable_triplet_transform is set to +dnl any non-void string or UNNAME does not match . +AS_CASE([x$ax_disable_triplet_transform/`uname`],[x/$1], + [_AX_TRIPLET_TRANSFORMATION([build],[$2],[$3]) + _AX_TRIPLET_TRANSFORMATION([host],[$2],[$3]) + AC_CANONICAL_HOST +])])dnl AX_CANONICAL_HOST + +dnl +dnl GAWK_CANONICAL_HOST +dnl +dnl This hackery shall fool LIBTOOL and make it believe under MSYS +dnl platforms that for build and/or host triplets with vendor `msys' +dnl we are on CYGWIN where LIBTOOL(2.4.6/Jan 2020) can handle well +dnl shared module libraries. +dnl +dnl Call `GAWK_CANONICAL_HOST' instead of `AC_CANONICAL_HOST' high up +dnl in configure.ac. +dnl +dnl Bypass the transformation procedure and simply call AC_CANONICAL_HOST instead +dnl with +dnl +dnl ./configure ax_disable_triplet_transform=yes +dnl +dnl Note that with this macro every setting for CYGWIN will be applied to MSYS. +dnl It is tested for the predominant use of generating shared module libraries +dnl on MSYS. +dnl +dnl TODO remove when MSYS is supported by LIBTOOL. +dnl +AC_DEFUN_ONCE([GAWK_CANONICAL_HOST], +[AX_CANONICAL_HOST([MSYS*],[s|-msys$|-cygwin|],[Triplet conversion on MSYS platform:]) +])dnl GAWK_CANONICAL_HOST |