diff options
Diffstat (limited to 'gcc-4.4.3/libgomp/acinclude.m4')
| -rw-r--r-- | gcc-4.4.3/libgomp/acinclude.m4 | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/gcc-4.4.3/libgomp/acinclude.m4 b/gcc-4.4.3/libgomp/acinclude.m4 new file mode 100644 index 000000000..ac450ca9b --- /dev/null +++ b/gcc-4.4.3/libgomp/acinclude.m4 @@ -0,0 +1,320 @@ +dnl ---------------------------------------------------------------------- +dnl This whole bit snagged from libgfortran. + +dnl Check whether the target supports __sync_*_compare_and_swap. +AC_DEFUN([LIBGOMP_CHECK_SYNC_BUILTINS], [ + AC_CACHE_CHECK([whether the target supports __sync_*_compare_and_swap], + libgomp_cv_have_sync_builtins, [ + AC_TRY_LINK([], [int foo, bar; bar = __sync_val_compare_and_swap(&foo, 0, 1);], + libgomp_cv_have_sync_builtins=yes, libgomp_cv_have_sync_builtins=no)]) + if test $libgomp_cv_have_sync_builtins = yes; then + AC_DEFINE(HAVE_SYNC_BUILTINS, 1, + [Define to 1 if the target supports __sync_*_compare_and_swap]) + fi]) + +dnl Check whether the target supports hidden visibility. +AC_DEFUN([LIBGOMP_CHECK_ATTRIBUTE_VISIBILITY], [ + AC_CACHE_CHECK([whether the target supports hidden visibility], + libgomp_cv_have_attribute_visibility, [ + save_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS -Werror" + AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }], + [], libgomp_cv_have_attribute_visibility=yes, + libgomp_cv_have_attribute_visibility=no) + CFLAGS="$save_CFLAGS"]) + if test $libgomp_cv_have_attribute_visibility = yes; then + AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1, + [Define to 1 if the target supports __attribute__((visibility(...))).]) + fi]) + +dnl Check whether the target supports dllexport +AC_DEFUN([LIBGOMP_CHECK_ATTRIBUTE_DLLEXPORT], [ + AC_CACHE_CHECK([whether the target supports dllexport], + libgomp_cv_have_attribute_dllexport, [ + save_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS -Werror" + AC_TRY_COMPILE([void __attribute__((dllexport)) foo(void) { }], + [], libgomp_cv_have_attribute_dllexport=yes, + libgomp_cv_have_attribute_dllexport=no) + CFLAGS="$save_CFLAGS"]) + if test $libgomp_cv_have_attribute_dllexport = yes; then + AC_DEFINE(HAVE_ATTRIBUTE_DLLEXPORT, 1, + [Define to 1 if the target supports __attribute__((dllexport)).]) + fi]) + +dnl Check whether the target supports symbol aliases. +AC_DEFUN([LIBGOMP_CHECK_ATTRIBUTE_ALIAS], [ + AC_CACHE_CHECK([whether the target supports symbol aliases], + libgomp_cv_have_attribute_alias, [ + AC_TRY_LINK([ +void foo(void) { } +extern void bar(void) __attribute__((alias("foo")));], + [bar();], libgomp_cv_have_attribute_alias=yes, libgomp_cv_have_attribute_alias=no)]) + if test $libgomp_cv_have_attribute_alias = yes; then + AC_DEFINE(HAVE_ATTRIBUTE_ALIAS, 1, + [Define to 1 if the target supports __attribute__((alias(...))).]) + fi]) + +sinclude(../libtool.m4) +dnl The lines below arrange for aclocal not to bring an installed +dnl libtool.m4 into aclocal.m4, while still arranging for automake to +dnl add a definition of LIBTOOL to Makefile.in. +ifelse(,,,[AC_SUBST(LIBTOOL) +AC_DEFUN([AM_PROG_LIBTOOL]) +AC_DEFUN([AC_LIBTOOL_DLOPEN]) +AC_DEFUN([AC_PROG_LD]) +]) + +dnl ---------------------------------------------------------------------- +dnl This whole bit snagged from libstdc++-v3. + +dnl +dnl LIBGOMP_ENABLE +dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING) +dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c) +dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER) +dnl +dnl See docs/html/17_intro/configury.html#enable for documentation. +dnl +m4_define([LIBGOMP_ENABLE],[dnl +m4_define([_g_switch],[--enable-$1])dnl +m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl + AC_ARG_ENABLE($1,_g_help, + m4_bmatch([$5], + [^permit ], + [[ + case "$enableval" in + m4_bpatsubst([$5],[permit ])) ;; + *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;; + dnl Idea for future: generate a URL pointing to + dnl "onlinedocs/configopts.html#whatever" + esac + ]], + [^$], + [[ + case "$enableval" in + yes|no) ;; + *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;; + esac + ]], + [[$5]]), + [enable_]m4_bpatsubst([$1],-,_)[=][$2]) +m4_undefine([_g_switch])dnl +m4_undefine([_g_help])dnl +]) + + +dnl +dnl If GNU ld is in use, check to see if tricky linker opts can be used. If +dnl the native linker is in use, all variables will be defined to something +dnl safe (like an empty string). +dnl +dnl Defines: +dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible +dnl OPT_LDFLAGS='-Wl,-O1' if possible +dnl LD (as a side effect of testing) +dnl Sets: +dnl with_gnu_ld +dnl libgomp_ld_is_gold (possibly) +dnl libgomp_gnu_ld_version (possibly) +dnl +dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will +dnl set libgomp_gnu_ld_version to 12345. Zeros cause problems. +dnl +AC_DEFUN([LIBGOMP_CHECK_LINKER_FEATURES], [ + # If we're not using GNU ld, then there's no point in even trying these + # tests. Check for that first. We should have already tested for gld + # by now (in libtool), but require it now just to be safe... + test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS='' + test -z "$OPT_LDFLAGS" && OPT_LDFLAGS='' + AC_REQUIRE([AC_PROG_LD]) + AC_REQUIRE([AC_PROG_AWK]) + + # The name set by libtool depends on the version of libtool. Shame on us + # for depending on an impl detail, but c'est la vie. Older versions used + # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on + # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually + # makes sense). We'll test with_gnu_ld everywhere else, so if that isn't + # set (hence we're using an older libtool), then set it. + if test x${with_gnu_ld+set} != xset; then + if test x${ac_cv_prog_gnu_ld+set} != xset; then + # We got through "ac_require(ac_prog_ld)" and still not set? Huh? + with_gnu_ld=no + else + with_gnu_ld=$ac_cv_prog_gnu_ld + fi + fi + + # Start by getting the version number. I think the libtool test already + # does some of this, but throws away the result. + libgomp_ld_is_gold=no + if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then + libgomp_ld_is_gold=yes + fi + changequote(,) + ldver=`$LD --version 2>/dev/null | head -1 | \ + sed -e 's/GNU \(go\)\{0,1\}ld \(version \)\{0,1\}\(([^)]*) \)\{0,1\}\([0-9.][0-9.]*\).*/\4/'` + changequote([,]) + libgomp_gnu_ld_version=`echo $ldver | \ + $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'` + + # Set --gc-sections. + if test "$with_gnu_ld" = "notbroken"; then + # GNU ld it is! Joy and bunny rabbits! + + # All these tests are for C++; save the language and the compiler flags. + # Need to do this so that g++ won't try to link in libstdc++ + ac_test_CFLAGS="${CFLAGS+set}" + ac_save_CFLAGS="$CFLAGS" + CFLAGS='-x c++ -Wl,--gc-sections' + + # Check for -Wl,--gc-sections + # XXX This test is broken at the moment, as symbols required for linking + # are now in libsupc++ (not built yet). In addition, this test has + # cored on solaris in the past. In addition, --gc-sections doesn't + # really work at the moment (keeps on discarding used sections, first + # .eh_frame and now some of the glibc sections for iconv). + # Bzzzzt. Thanks for playing, maybe next time. + AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections]) + AC_TRY_RUN([ + int main(void) + { + try { throw 1; } + catch (...) { }; + return 0; + } + ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes]) + if test "$ac_test_CFLAGS" = set; then + CFLAGS="$ac_save_CFLAGS" + else + # this is the suspicious part + CFLAGS='' + fi + if test "$ac_sectionLDflags" = "yes"; then + SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS" + fi + AC_MSG_RESULT($ac_sectionLDflags) + fi + + # Set linker optimization flags. + if test x"$with_gnu_ld" = x"yes"; then + OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS" + fi + + AC_SUBST(SECTION_LDFLAGS) + AC_SUBST(OPT_LDFLAGS) +]) + + +dnl +dnl Add version tags to symbols in shared library (or not), additionally +dnl marking other symbols as private/local (or not). +dnl +dnl --enable-symvers=style adds a version script to the linker call when +dnl creating the shared library. The choice of version script is +dnl controlled by 'style'. +dnl --disable-symvers does not. +dnl + Usage: LIBGOMP_ENABLE_SYMVERS[(DEFAULT)] +dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to +dnl choose a default style based on linker characteristics. Passing +dnl 'no' disables versioning. +dnl +AC_DEFUN([LIBGOMP_ENABLE_SYMVERS], [ + +LIBGOMP_ENABLE(symvers,yes,[=STYLE], + [enables symbol versioning of the shared library], + [permit yes|no|gnu]) + +# If we never went through the LIBGOMP_CHECK_LINKER_FEATURES macro, then we +# don't know enough about $LD to do tricks... +AC_REQUIRE([LIBGOMP_CHECK_LINKER_FEATURES]) +# FIXME The following test is too strict, in theory. +if test $enable_shared = no || + test "x$LD" = x || + test x$libgomp_gnu_ld_version = x; then + enable_symvers=no +fi + +# Check to see if libgcc_s exists, indicating that shared libgcc is possible. +if test $enable_symvers != no; then + AC_MSG_CHECKING([for shared libgcc]) + ac_save_CFLAGS="$CFLAGS" + CFLAGS=' -lgcc_s' + AC_TRY_LINK(, [return 0;], libgomp_shared_libgcc=yes, libgomp_shared_libgcc=no) + CFLAGS="$ac_save_CFLAGS" + if test $libgomp_shared_libgcc = no; then + cat > conftest.c <<EOF +int main (void) { return 0; } +EOF +changequote(,)dnl + libgomp_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \ + -shared -shared-libgcc -o conftest.so \ + conftest.c -v 2>&1 >/dev/null \ + | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'` +changequote([,])dnl + rm -f conftest.c conftest.so + if test x${libgomp_libgcc_s_suffix+set} = xset; then + CFLAGS=" -lgcc_s$libgomp_libgcc_s_suffix" + AC_TRY_LINK(, [return 0;], libgomp_shared_libgcc=yes) + CFLAGS="$ac_save_CFLAGS" + fi + fi + AC_MSG_RESULT($libgomp_shared_libgcc) +fi + +# For GNU ld, we need at least this version. The format is described in +# LIBGOMP_CHECK_LINKER_FEATURES above. +libgomp_min_gnu_ld_version=21400 +# XXXXXXXXXXX libgomp_gnu_ld_version=21390 + +# Check to see if unspecified "yes" value can win, given results above. +# Change "yes" into either "no" or a style name. +if test $enable_symvers = yes; then + if test $with_gnu_ld = yes && + test $libgomp_shared_libgcc = yes; + then + if test $libgomp_gnu_ld_version -ge $libgomp_min_gnu_ld_version ; then + enable_symvers=gnu + elif test $libgomp_ld_is_gold = yes ; then + enable_symvers=gnu + else + # The right tools, the right setup, but too old. Fallbacks? + AC_MSG_WARN(=== Linker version $libgomp_gnu_ld_version is too old for) + AC_MSG_WARN(=== full symbol versioning support in this release of GCC.) + AC_MSG_WARN(=== You would need to upgrade your binutils to version) + AC_MSG_WARN(=== $libgomp_min_gnu_ld_version or later and rebuild GCC.) + if test $libgomp_gnu_ld_version -ge 21200 ; then + # Globbing fix is present, proper block support is not. + dnl AC_MSG_WARN([=== Dude, you are soooo close. Maybe we can fake it.]) + dnl enable_symvers=??? + AC_MSG_WARN([=== Symbol versioning will be disabled.]) + enable_symvers=no + else + # 2.11 or older. + AC_MSG_WARN([=== Symbol versioning will be disabled.]) + enable_symvers=no + fi + fi + else + # just fail for now + AC_MSG_WARN([=== You have requested some kind of symbol versioning, but]) + AC_MSG_WARN([=== either you are not using a supported linker, or you are]) + AC_MSG_WARN([=== not building a shared libgcc_s (which is required).]) + AC_MSG_WARN([=== Symbol versioning will be disabled.]) + enable_symvers=no + fi +fi + +AC_CACHE_CHECK([whether the target supports .symver directive], + libgomp_cv_have_as_symver_directive, [ + AC_TRY_COMPILE([void foo (void); __asm (".symver foo, bar@SYMVER");], + [], libgomp_cv_have_as_symver_directive=yes, + libgomp_cv_have_as_symver_directive=no)]) +if test $libgomp_cv_have_as_symver_directive = yes; then + AC_DEFINE(HAVE_AS_SYMVER_DIRECTIVE, 1, + [Define to 1 if the target assembler supports .symver directive.]) +fi + +AM_CONDITIONAL(LIBGOMP_BUILD_VERSIONED_SHLIB, test $enable_symvers != no) +AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers) +]) |