r268690 - in /branches/gcc-8-branch/libstdc++-v...
redi@gcc.gnu.org
redi@gcc.gnu.org
Fri Feb 8 14:14:00 GMT 2019
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 <jwakely@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
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