https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66192
--- Comment #6 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> --- Author: ramana Date: Fri Jun 12 09:49:41 2015 New Revision: 224411 URL: https://gcc.gnu.org/viewcvs?rev=224411&root=gcc&view=rev Log: Use atomics in guard.cc. This provides proper definitions for _GLIBCXX_READ_MEM_BARRIER and _GLIBCXX_WRITE_MEM_BARRIER, rewrites the guards in terms of proper atomic extensions and removes internal uses of _GLIBCXX_READ_MEM_BARRIER and _GLIBCXX_WRITE_MEM_BARRIER and replaces them with equivalent atomics. 2015-06-12 Ramana Radhakrishnan <ramana.radhakrish...@arm.com> PR target/66200 PR c++/66192 * * config/cpu/generic/atomic_word.h (_GLIBCXX_READ_MEM_BARRIER): Define (_GLIBCXX_WRITE_MEM_BARRIER): Likewise * include/bits/shared_ptr_base.h: Use ACQ_REL barrier. * include/ext/atomicity.h: Likewise. * include/tr1/shared_ptr.h: Likewise. * libsupc++/guard.cc (__test_and_acquire): Rewrite with atomics. Update comment. (__set_and_release): Likewise. * testsuite/20_util/shared_ptr/cons/43820_neg.cc (test01): Adjust for line numbers. * testsuite/20_util/shared_ptr/cons/void_neg.cc: Likewise. * testsuite/tr1/2_general_utilities/shared_ptr/cons/43820_neg.cc: Likewise. Modified: trunk/libstdc++-v3/ChangeLog trunk/libstdc++-v3/config/cpu/generic/atomic_word.h trunk/libstdc++-v3/include/bits/shared_ptr_base.h trunk/libstdc++-v3/include/ext/atomicity.h trunk/libstdc++-v3/include/tr1/shared_ptr.h trunk/libstdc++-v3/libsupc++/guard.cc trunk/libstdc++-v3/testsuite/20_util/shared_ptr/cons/43820_neg.cc trunk/libstdc++-v3/testsuite/20_util/shared_ptr/cons/void_neg.cc trunk/libstdc++-v3/testsuite/tr1/2_general_utilities/shared_ptr/cons/43820_neg.cc
