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author | Marc Mutz <marc.mutz@kdab.com> | 2016-05-26 08:30:26 +0200 |
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committer | Marc Mutz <marc.mutz@kdab.com> | 2017-03-10 08:24:41 +0000 |
commit | 5cc0de2e084cb887a75b076b82cf470ecdcd4dd3 (patch) | |
tree | 1224e3ca3f635c881d0b520adb019ab696b1e7a2 /src/corelib/io/qlockfile_unix.cpp | |
parent | 9ed389bf15787266c207435d712b9e225db07ad9 (diff) |
QAtomic: pass explicit failure memory order to std::atomic::compare_exchange_strong
GCC 4.8 seems to get the failure memory order wrong when using the
overload that only accepts one memory order and produces errors such
as:
bits/atomic_base.h:577:70: error: failure memory model cannot be stronger than success memory model for '__atomic_compare_exchange'
return __atomic_compare_exchange_n(&_M_i, &__i1, __i2, 0, __m1, __m2);
^
(as seen on Android).
Fix by explicitly passing the failure orders corresponding to the
success orders, as specified by the standard:
relaxed → relaxed
release → relaxed
acquire → acquire
acq_rel → acquire
(cf. http://en.cppreference.com/w/cpp/atomic/atomic/compare_exchange).
Task-number: QTBUG-59399
Change-Id: If046e735888cf331d2d6506d8d5ca9aa7402f9ad
Reviewed-by: David Faure <david.faure@kdab.com>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
Diffstat (limited to 'src/corelib/io/qlockfile_unix.cpp')
0 files changed, 0 insertions, 0 deletions