https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88119
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> --- Author: redi Date: Fri Feb 8 14:14:57 2019 New Revision: 268690 URL: https://gcc.gnu.org/viewcvs?rev=268690&root=gcc&view=rev Log: PR libstdc++/88119 use alignof in std::alignment_of, not __alignof__ Now that __alignof__ and alignof sometimes disagree it matters which one we use. The standard says that std::alignment_of<T>::value equals alignof(T), so we need to use that. Change the only uses of alignment_of to use __alignof__ to avoid a change in alignment. Backport from mainline 2018-11-29 Jonathan Wakely <jwak...@redhat.com> PR libstdc++/88119 * include/ext/aligned_buffer.h (__aligned_membuf): Add comment. (__aligned_buffer): Use __alignof__ instead of std::alignment_of. * include/std/type_traits (alignment_of): Use alignof instead of __alignof__. * testsuite/20_util/alignment_of/value.cc: Fix test to check values match alignof not __alignof__, as required by the standard. Modified: branches/gcc-8-branch/libstdc++-v3/ChangeLog branches/gcc-8-branch/libstdc++-v3/include/ext/aligned_buffer.h branches/gcc-8-branch/libstdc++-v3/include/std/type_traits branches/gcc-8-branch/libstdc++-v3/testsuite/20_util/alignment_of/value.cc
