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After the front end change r16-7199 both GCC and Clang allow non-empty constexpr constructor bodies in C++11 as an extension, so we can now unconditionally enable the __builtin_clear_padding logic in std::atomic's constructor. PR libstdc++/114865 libstdc++-v3/ChangeLog: * include/std/atomic (atomic<_Tp>::atomic(_Tp)) [C++11]: Enable __builtin_clear_padding logic. * testsuite/29_atomics/atomic/compare_exchange_padding.cc: Enable this test in earlier modes, including C++11. * testsuite/29_atomics/atomic/cons/zero_padding.cc [C++11]: Enable tests verifying cleared padding bits for a non-static-init std::atomic object. Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com> Reviewed-by: Jonathan Wakely <jwakely@redhat.com>