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Disable the use of std::call_once on OpenBSD with libstdc++.

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It was noticed this caused performance regressions and deadlocks. PR30768.

Reorder the code to make it clearer what is tested.

PPC now disables the use of std::call_once only with libstdc++ with
the reordering of the code, as was the original intent.

llvm-svn: 285782
This commit is contained in:
Brad Smith 2016-11-02 01:39:01 +00:00
parent faf00da81c
commit 932954ed4f
1 changed files with 5 additions and 5 deletions
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10
include/llvm/Support/Threading.h
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@ -20,11 +20,11 @@
#include <ciso646> // So we can check the C++ standard lib macros.
#include <functional>
// We use std::call_once on all Unix platforms except for NetBSD with
// libstdc++. That platform has a bug they are working to fix, and they'll
// remove the NetBSD checks once fixed.
#if defined(LLVM_ON_UNIX) && \
!(defined(__NetBSD__) && !defined(_LIBCPP_VERSION)) && !defined(__ppc__)
// std::call_once from libc++ is used on all Unix platforms. Other
// implementations like libstdc++ are known to have problems on NetBSD,
// OpenBSD and PowerPC.
#if defined(LLVM_ON_UNIX) && (defined(_LIBCPP_VERSION) || \
!(defined(__NetBSD__) || defined(__OpenBSD__) || defined(__ppc__)))
#define LLVM_THREADING_USE_STD_CALL_ONCE 1
#else
#define LLVM_THREADING_USE_STD_CALL_ONCE 0