diff options
| author | Iain Sandoe <iains@gcc.gnu.org> | 2011-11-22 14:49:11 +0000 |
|---|---|---|
| committer | Iain Sandoe <iains@gcc.gnu.org> | 2011-11-22 14:49:11 +0000 |
| commit | 8cf36bb3b8eade04837bea3cc8f7e4cd1eb8904d (patch) | |
| tree | 2c26188cd406f39ca321e6a5612b5d17b6376b1e /config | |
| parent | 8fb013576c6fc493f096492e4b10724c83f294d8 (diff) | |
| download | gcc-8cf36bb3b8eade04837bea3cc8f7e4cd1eb8904d.tar.gz | |
weakref.m4: New file.
config:
* weakref.m4: New file.
libitm:
* configure.ac: Use GCC_CHECK_ELF_STYLE_WEAKREF.
* alloc_cpp.cc: Generate dummy functions if we don't
HAVE_ELF_STYLE_WEAKREF.
* eh_cpp.cc: Likewise.
* configure: Regenerate.
* aclocal.m4: Likewise.
* config.h.in: Likewise.
* Makefile.in: Likewise.
* testsuite/Makefile.in: Likewise.
From-SVN: r181618
Diffstat (limited to 'config')
| -rw-r--r-- | config/ChangeLog | 4 | ||||
| -rw-r--r-- | config/weakref.m4 | 48 |
2 files changed, 52 insertions, 0 deletions
diff --git a/config/ChangeLog b/config/ChangeLog index 4f202ffbc9a..4ebecc32f70 100644 --- a/config/ChangeLog +++ b/config/ChangeLog @@ -1,3 +1,7 @@ +2011-11-22 Iain Sandoe <iains@gcc.gnu.org> + + * weakref.m4: New file. + 2011-11-09 Richard Henderson <rth@redhat.com> * asmcfi.m4: New file. diff --git a/config/weakref.m4 b/config/weakref.m4 new file mode 100644 index 00000000000..39b63d39b8a --- /dev/null +++ b/config/weakref.m4 @@ -0,0 +1,48 @@ + +dnl Check if the target supports weak. +AC_DEFUN([GCC_CHECK_ATTRIBUTE_WEAK], [ + AC_CACHE_CHECK([whether the target supports weak], + ac_cv_have_attribute_weak, [ + weakref_m4_saved_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS -Werror" + AC_TRY_COMPILE([void __attribute__((weak)) foo(void) { }], + [], ac_cv_have_attribute_weak=yes, + ac_cv_have_attribute_weak=no) + CFLAGS="$weakref_m4_saved_CFLAGS"]) + if test x"$ac_cv_have_attribute_weak" = xyes; then + AC_DEFINE(HAVE_ATTRIBUTE_WEAK, 1, + [Define to 1 if the target supports __attribute__((weak)).]) + fi]) + +dnl Check whether weak refs work like the ELF ones. +dnl This means that the weak reference works without having to satify +dnl linkage for the item. +dnl There are targets (at least Darwin) where we have fully functional +dnl weakrefs at runtime, but must supply the referenced item at link time. +AC_DEFUN([GCC_CHECK_ELF_STYLE_WEAKREF], [ + AC_CACHE_CHECK([whether weak refs work like ELF], + ac_cv_have_elf_style_weakref, [ + weakref_m4_saved_CFLAGS="$CFLAGS" + case "${host}" in + *-apple-darwin*) CFLAGS="$CFLAGS -Wl,-undefined,dynamic_lookup" ;; + *) ;; + esac + AC_RUN_IFELSE([AC_LANG_SOURCE([[ +extern void fNotToBeFound(void) __attribute__((weak)); +int main () +{ + if (fNotToBeFound) + return 1; + else + return 0; +} +]])], ac_cv_have_elf_style_weakref=yes, ac_cv_have_elf_style_weakref=no, [ +case "${host}" in + alpha*-dec-osf*) ac_cv_have_elf_style_weakref=no ;; + *-apple-darwin[[89]]*) ac_cv_have_elf_style_weakref=no ;; + *) ac_cv_have_elf_style_weakref=yes;; +esac])CFLAGS="$weakref_m4_saved_CFLAGS"]) +if test x"$ac_cv_have_elf_style_weakref" = xyes; then + AC_DEFINE(HAVE_ELF_STYLE_WEAKREF, 1, [Define to 1 if target has a weakref that works like the ELF one.]) +fi]) + |