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From: "ozabluda at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/54861] std::atomic_signal_fence(std::memory_order_seq_cst) issues unnecessary mfence
Date: Tue, 09 Oct 2012 18:49:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54861

--- Comment #3 from Oleg Zabluda <ozabluda at gmail dot com> 2012-10-09 18:48:56 UTC ---
I can confirm that this fixes it in gcc 4.7.0.