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