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* configure.ac (--enable-linux-futex): Add new configure option.
(HAVE_LINUX_FUTEX): New AC_DEFINE.
* Makefile.in: Rebuilt.
* aclocal.m4: Rebuilt.
* configure: Rebuilt.
* config.h.in: Rebuilt.
* config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_BIT,
_GLIBCXX_GUARD_PENDING_BIT, _GLIBCXX_GUARD_WAITING_BIT): Define.
* config/cpu/arm/cxxabi_tweaks.h (_GLIBCXX_GUARD_BIT,
_GLIBCXX_GUARD_PENDING_BIT, _GLIBCXX_GUARD_WAITING_BIT): Define.
* libsupc++/guard.cc: Include climits and syscall.h.
(_GLIBCXX_USE_FUTEX): Define if futex syscall and atomic builtins
are supported.
(_GLIBCXX_FUTEX_WAIT, _GLIBCXX_FUTEX_WAKE): Likewise.
(__guard_test_bit): New static inline.
(__cxa_guard_acquire, __cxa_guard_release, __cxa_guard_abort): Use
atomic builtins and futex syscall if _GLIBCXX_USE_FUTEX.
config/
* futex.m4: New file.
libgomp/
* configure.ac: Move futex checking into ../config/futex.m4.
* configure: Rebuilt.
* aclocal.m4: Rebuilt.
* Makefile.in: Rebuilt.
* configure.tgt: Rename have_tls to gcc_cv_have_tls to match
2007-10-15 ../config/tls.m4 change.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@131399 138bc75d-0d04-0410-961f-82ee72b054a4
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