diff options
Diffstat (limited to 'libatomic/acinclude.m4')
-rw-r--r-- | libatomic/acinclude.m4 | 637 |
1 files changed, 637 insertions, 0 deletions
diff --git a/libatomic/acinclude.m4 b/libatomic/acinclude.m4 new file mode 100644 index 0000000..13206f0 --- /dev/null +++ b/libatomic/acinclude.m4 @@ -0,0 +1,637 @@ +dnl +dnl Unconditionally define a preprocessor macro, translating the shell +dnl macro from yes/no to 1/0. +dnl +AC_DEFUN([LIBAT_DEFINE_YESNO], [ + yesno=`echo $2 | tr 'yesno' '1 0 '` + AC_DEFINE_UNQUOTED([$1], $yesno, [$3]) +]) +dnl +dnl Iterate over all of the modes we're prepared to check. +dnl +AC_DEFUN([LIBAT_FORALL_MODES], + [$1(QI,1) + $1(HI,2) + $1(SI,4) + $1(DI,8) + $1(TI,16)] +) +dnl +dnl Check for builtin types by mode. +dnl +dnl A less interesting of size checking than autoconf normally provides. +dnl We know that gcc always provides <stdint.h>, but we don't often +dnl provide a builtin type for TImode. +dnl +AC_DEFUN([LIBAT_HAVE_INT_MODE],[ + AC_CACHE_CHECK([for $2 byte integer],[libat_cv_have_mode_$1], + [AC_COMPILE_IFELSE([int x __attribute__((mode($1)));], + [libat_cv_have_mode_$1=yes],[libat_cv_have_mode_$1=no])]) + LIBAT_DEFINE_YESNO([HAVE_INT$2], [$libat_cv_have_mode_$1], + [Have support for $2 byte integers.]) + if test x$libat_cv_have_mode_$1 = xyes; then + SIZES="$SIZES $2" + fi +]) +dnl +dnl Check for atomic builtins. +dnl See: +dnl http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html +dnl +dnl This checks to see if the host supports the compiler-generated +dnl builtins for atomic operations for various integral sizes. +dnl +AC_DEFUN([LIBAT_TEST_ATOMIC_INIT],[ + # Do link tests if possible, instead asm tests, limited to some platforms + # see discussion in PR target/40134, PR libstdc++/40133 and the thread + # starting at http://gcc.gnu.org/ml/gcc-patches/2009-07/msg00322.html + atomic_builtins_link_tests=no + if test x$gcc_no_link != xyes; then + # Can do link tests. Limit to some tested platforms + case "$host" in + *-*-linux* | *-*-uclinux* | *-*-kfreebsd*-gnu | *-*-gnu*) + atomic_builtins_link_tests=yes + ;; + esac + fi +]) +AC_DEFUN([LIBAT_TEST_ATOMIC_BUILTIN],[ + AC_CACHE_CHECK([$1],[$2],[ + AC_LANG_CONFTEST([AC_LANG_PROGRAM([],[$3])]) + if test x$atomic_builtins_link_tests = xyes; then + if AC_TRY_EVAL(ac_link); then + eval $2=yes + else + eval $2=no + fi + else + old_CFLAGS="$CFLAGS" + # Compile unoptimized. + CFLAGS='-O0 -S' + if AC_TRY_EVAL(ac_compile); then + if grep __atomic_ conftest.s >/dev/null 2>&1 ; then + eval $2=no + else + eval $2=yes + fi + fi + CFLAGS="$old_CFLAGS" + fi + rm -f conftest* + ]) +]) + +dnl +dnl Test if we have __atomic_load and __atomic_store for mode $1, size $2 +dnl +AC_DEFUN([LIBAT_HAVE_ATOMIC_LOADSTORE],[ + LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_load/store for size $2], + [libat_cv_have_at_ldst_$2], + [typedef int T __attribute__((mode($1))); + T *x; volatile T sink; asm("" : "=g"(x)); + sink = __atomic_load_n(x, 0); + __atomic_store_n(x, sink, 0);]) + LIBAT_DEFINE_YESNO([HAVE_ATOMIC_LDST_$2], [$libat_cv_have_at_ldst_$2], + [Have __atomic_load/store for $2 byte integers.]) + AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_LDST_$2 HAVE_ATOMIC_LDST_$2]) +]) + +dnl +dnl Test if we have __atomic_test_and_set for mode $1, size $2 +dnl +AC_DEFUN([LIBAT_HAVE_ATOMIC_TAS],[ + LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_test_and_set for size $2], + [libat_cv_have_at_tas_$2], + [typedef int T __attribute__((mode($1))); T *x; asm("" : "=g"(x)); + __atomic_test_and_set(x, 0);]) + LIBAT_DEFINE_YESNO([HAVE_ATOMIC_TAS_$2], [$libat_cv_have_at_tas_$2], + [Have __atomic_test_and_set for $2 byte integers.]) + AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_TAS_$2 HAVE_ATOMIC_TAS_$2]) +]) + +dnl +dnl Test if we have __atomic_exchange for mode $1, size $2 +dnl +AC_DEFUN([LIBAT_HAVE_ATOMIC_EXCHANGE],[ + LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_exchange for size $2], + [libat_cv_have_at_exch_$2], + [typedef int T __attribute__((mode($1))); T *x; asm("" : "=g"(x)); + __atomic_exchange_n(x, 0, 0);]) + LIBAT_DEFINE_YESNO([HAVE_ATOMIC_EXCHANGE_$2], [$libat_cv_have_at_exch_$2], + [Have __atomic_exchange for $2 byte integers.]) + AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_EXCHANGE_$2 HAVE_ATOMIC_EXCHANGE_$2]) +]) + +dnl +dnl Test if we have __atomic_compare_exchange for mode $1, size $2 +dnl +AC_DEFUN([LIBAT_HAVE_ATOMIC_CAS],[ + LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_compare_exchange for size $2], + [libat_cv_have_at_cas_$2], + [typedef int T __attribute__((mode($1))); T *x, *y; + asm("" : "=g"(x), "=g"(y)); + __atomic_compare_exchange_n(x, y, 0, 0, 0, 0);]) + LIBAT_DEFINE_YESNO([HAVE_ATOMIC_CAS_$2], [$libat_cv_have_at_cas_$2], + [Have __atomic_compare_exchange for $2 byte integers.]) + AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_CAS_$2 HAVE_ATOMIC_CAS_$2]) +]) + +dnl +dnl Test if we have __atomic_fetch_add for mode $1, size $2 +dnl +AC_DEFUN([LIBAT_HAVE_ATOMIC_FETCH_ADD],[ + LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_fetch_add for size $2], + [libat_cv_have_at_fadd_$2], + [typedef int T __attribute__((mode($1))); T *x, y; + asm("" : "=g"(x), "=g"(y)); + __atomic_fetch_add (x, y, 0); + __atomic_add_fetch (x, y, 0);]) + LIBAT_DEFINE_YESNO([HAVE_ATOMIC_FETCH_ADD_$2], [$libat_cv_have_at_fadd_$2], + [Have __atomic_fetch_add for $2 byte integers.]) + AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_FETCH_ADD_$2 HAVE_ATOMIC_FETCH_ADD_$2]) +]) + +dnl +dnl Test if we have __atomic_fetch_op for all op for mode $1, size $2 +dnl +AC_DEFUN([LIBAT_HAVE_ATOMIC_FETCH_OP],[ + LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_fetch_op for size $2], + [libat_cv_have_at_fop_$2], + [typedef int T __attribute__((mode($1))); T *x, y; + asm("" : "=g"(x), "=g"(y)); + __atomic_fetch_add (x, y, 0); __atomic_add_fetch (x, y, 0); + __atomic_fetch_sub (x, y, 0); __atomic_sub_fetch (x, y, 0); + __atomic_fetch_and (x, y, 0); __atomic_and_fetch (x, y, 0); + __atomic_fetch_nand (x, y, 0); __atomic_nand_fetch (x, y, 0); + __atomic_fetch_xor (x, y, 0); __atomic_xor_fetch (x, y, 0); + __atomic_fetch_or (x, y, 0); __atomic_or_fetch (x, y, 0); ]) + LIBAT_DEFINE_YESNO([HAVE_ATOMIC_FETCH_OP_$2], [$libat_cv_have_at_fop_$2], + [Have __atomic_fetch_op for all op for $2 byte integers.]) + AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_FETCH_OP_$2 HAVE_ATOMIC_FETCH_OP_$2]) +]) + +dnl +dnl Test for the size of the target word. +dnl +AC_DEFUN([LIBAT_WORDSIZE],[ + AC_CACHE_CHECK([for the word size],[libat_cv_wordsize], + [AC_COMPUTE_INT(libat_cv_wordsize, + [sizeof(word)], [typedef int word __attribute__((mode(word)));], + AC_ERROR([Could not determine word size.]))]) + AC_DEFINE_UNQUOTED(WORDSIZE, $libat_cv_wordsize, + [The word size in bytes of the machine.]) +]) + +dnl +dnl Check whether the target supports ifuncs. +dnl +AC_DEFUN([LIBAT_CHECK_IFUNC], [ + AC_CACHE_CHECK([whether the target supports funcs], libat_cv_have_ifunc, [ + save_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS -Werror" + AC_TRY_LINK([ + int foo_alt(void) { return 0; } + void *foo_sel(void) { return foo_alt; } + int foo(void) __attribute__((ifunc("foo_sel")));], + [return foo();], libat_cv_have_ifunc=yes, libat_cv_have_ifunc=no)]) + LIBAT_DEFINE_YESNO([HAVE_IFUNC], [$libat_cv_have_ifunc], + [Define to 1 if the target supports __attribute__((ifunc(...))).]) +]) + +dnl ---------------------------------------------------------------------- +dnl This whole bit snagged from libitm. + +dnl Check whether the target supports hidden visibility. +AC_DEFUN([LIBAT_CHECK_ATTRIBUTE_VISIBILITY], [ + AC_CACHE_CHECK([whether the target supports hidden visibility], + libat_cv_have_attribute_visibility, [ + save_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS -Werror" + AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }], + [], libat_cv_have_attribute_visibility=yes, + libat_cv_have_attribute_visibility=no) + CFLAGS="$save_CFLAGS"]) + if test $libat_cv_have_attribute_visibility = yes; then + AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1, + [Define to 1 if the target supports __attribute__((visibility(...))).]) + fi]) + +dnl Check whether the target supports dllexport +AC_DEFUN([LIBAT_CHECK_ATTRIBUTE_DLLEXPORT], [ + AC_CACHE_CHECK([whether the target supports dllexport], + libat_cv_have_attribute_dllexport, [ + save_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS -Werror" + AC_TRY_COMPILE([void __attribute__((dllexport)) foo(void) { }], + [], libat_cv_have_attribute_dllexport=yes, + libat_cv_have_attribute_dllexport=no) + CFLAGS="$save_CFLAGS"]) + if test $libat_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([LIBAT_CHECK_ATTRIBUTE_ALIAS], [ + AC_CACHE_CHECK([whether the target supports symbol aliases], + libat_cv_have_attribute_alias, [ + AC_TRY_LINK([ +void foo(void) { } +extern void bar(void) __attribute__((alias("foo")));], + [bar();], libat_cv_have_attribute_alias=yes, libat_cv_have_attribute_alias=no)]) + if test $libat_cv_have_attribute_alias = yes; then + AC_DEFINE(HAVE_ATTRIBUTE_ALIAS, 1, + [Define to 1 if the target supports __attribute__((alias(...))).]) + fi]) + +dnl ---------------------------------------------------------------------- +dnl This whole bit snagged from libstdc++-v3. + +dnl +dnl LIBAT_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([LIBAT_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],-,_)[=][$2]) +m4_undefine([_g_switch])dnl +m4_undefine([_g_help])dnl +]) + +dnl +dnl If GNU ld is in use, check to see if tricky linker opts can be used. If +dnl the native linker is in use, all variables will be defined to something +dnl safe (like an empty string). +dnl +dnl Defines: +dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible +dnl OPT_LDFLAGS='-Wl,-O1' if possible +dnl LD (as a side effect of testing) +dnl Sets: +dnl with_gnu_ld +dnl libat_ld_is_gold (possibly) +dnl libat_gnu_ld_version (possibly) +dnl +dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will +dnl set libat_gnu_ld_version to 12345. Zeros cause problems. +dnl +AC_DEFUN([LIBAT_CHECK_LINKER_FEATURES], [ + # If we're not using GNU ld, then there's no point in even trying these + # tests. Check for that first. We should have already tested for gld + # by now (in libtool), but require it now just to be safe... + test -z "$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. + libat_ld_is_gold=no + if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then + libat_ld_is_gold=yes + fi + changequote(,) + ldver=`$LD --version 2>/dev/null | + sed -e 's/GNU gold /GNU ld /;s/GNU ld version /GNU ld /;s/GNU ld ([^)]*) /GNU ld /;s/GNU ld \([0-9.][0-9.]*\).*/\1/; q'` + changequote([,]) + libat_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 $OPT_LDFLAGS" + fi + + AC_SUBST(SECTION_LDFLAGS) + AC_SUBST(OPT_LDFLAGS) +]) + + +dnl +dnl If GNU ld is in use, check to see if tricky linker opts can be used. If +dnl the native linker is in use, all variables will be defined to something +dnl safe (like an empty string). +dnl +dnl Defines: +dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible +dnl OPT_LDFLAGS='-Wl,-O1' if possible +dnl LD (as a side effect of testing) +dnl Sets: +dnl with_gnu_ld +dnl libat_ld_is_gold (possibly) +dnl libat_gnu_ld_version (possibly) +dnl +dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will +dnl set libat_gnu_ld_version to 12345. Zeros cause problems. +dnl +AC_DEFUN([LIBAT_CHECK_LINKER_FEATURES], [ + # If we're not using GNU ld, then there's no point in even trying these + # tests. Check for that first. We should have already tested for gld + # by now (in libtool), but require it now just to be safe... + test -z "$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. + libat_ld_is_gold=no + if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then + libat_ld_is_gold=yes + fi + changequote(,) + ldver=`$LD --version 2>/dev/null | + sed -e 's/GNU gold /GNU ld /;s/GNU ld version /GNU ld /;s/GNU ld ([^)]*) /GNU ld /;s/GNU ld \([0-9.][0-9.]*\).*/\1/; q'` + changequote([,]) + libat_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: LIBAT_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([LIBAT_ENABLE_SYMVERS], [ + +LIBAT_ENABLE(symvers,yes,[=STYLE], + [enables symbol versioning of the shared library], + [permit yes|no|gnu*|sun]) + +# If we never went through the LIBAT_CHECK_LINKER_FEATURES macro, then we +# don't know enough about $LD to do tricks... +AC_REQUIRE([LIBAT_CHECK_LINKER_FEATURES]) + +# Turn a 'yes' into a suitable default. +if test x$enable_symvers = xyes ; then + # FIXME The following test is too strict, in theory. + if test $enable_shared = no || test "x$LD" = x; then + enable_symvers=no + else + if test $with_gnu_ld = yes ; then + enable_symvers=gnu + else + case ${target_os} in + # Sun symbol versioning exists since Solaris 2.5. + solaris2.[[5-9]]* | solaris2.1[[0-9]]*) + enable_symvers=sun ;; + *) + enable_symvers=no ;; + esac + fi + fi +fi + +# Check if 'sun' was requested on non-Solaris 2 platforms. +if test x$enable_symvers = xsun ; then + case ${target_os} in + solaris2*) + # All fine. + ;; + *) + # Unlikely to work. + AC_MSG_WARN([=== You have requested Sun symbol versioning, but]) + AC_MSG_WARN([=== you are not targetting Solaris 2.]) + AC_MSG_WARN([=== Symbol versioning will be disabled.]) + enable_symvers=no + ;; + esac +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;], libat_shared_libgcc=yes, libat_shared_libgcc=no) + CFLAGS="$ac_save_CFLAGS" + if test $libat_shared_libgcc = no; then + cat > conftest.c <<EOF +int main (void) { return 0; } +EOF +changequote(,)dnl + libat_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \ + -shared -shared-libgcc -o conftest.so \ + conftest.c -v 2>&1 >/dev/null \ + | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'` +changequote([,])dnl + rm -f conftest.c conftest.so + if test x${libat_libgcc_s_suffix+set} = xset; then + CFLAGS=" -lgcc_s$libat_libgcc_s_suffix" + AC_TRY_LINK(, [return 0;], libat_shared_libgcc=yes) + CFLAGS="$ac_save_CFLAGS" + fi + fi + AC_MSG_RESULT($libat_shared_libgcc) +fi + +# For GNU ld, we need at least this version. The format is described in +# LIBAT_CHECK_LINKER_FEATURES above. +libat_min_gnu_ld_version=21400 +# XXXXXXXXXXX libat_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 != no && test $libat_shared_libgcc = yes; then + if test $with_gnu_ld = yes; then + if test $libat_gnu_ld_version -ge $libat_min_gnu_ld_version ; then + enable_symvers=gnu + elif test $libat_ld_is_gold = yes ; then + enable_symvers=gnu + else + # The right tools, the right setup, but too old. Fallbacks? + AC_MSG_WARN(=== Linker version $libat_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(=== $libat_min_gnu_ld_version or later and rebuild GCC.) + if test $libat_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 + elif test $enable_symvers = sun; then + : All interesting versions of Sun ld support sun style symbol versioning. + 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 +if test $enable_symvers = gnu; then + AC_DEFINE(LIBAT_GNU_SYMBOL_VERSIONING, 1, + [Define to 1 if GNU symbol versioning is used for libatomic.]) +fi + +AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB, test $enable_symvers != no) +AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB_GNU, test $enable_symvers = gnu) +AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB_SUN, test $enable_symvers = sun) +AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers) +]) + +dnl ---------------------------------------------------------------------- +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]) +]) |