forked from OSchip/llvm-project
b038a5268f
Define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_[1248] macros on SystemZ.
This fixes a miscompile of GCC C++11 standard library headers
due to use of those macros in an ABI-changing manner.
See e.g. /usr/include/c++/4.8.5/ext/concurrence.h:
// Compile time constant that indicates prefered locking policy in
// the current configuration.
static const _Lock_policy __default_lock_policy =
#ifdef __GTHREADS
#if (defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2) \
&& defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4))
_S_atomic;
#else
_S_mutex;
#endif
#else
_S_single;
#endif
A different choice of __default_lock_policy causes different
sizes of several of the C++11 data structures, which are then
incompatible when inlined in clang-compiled code with what the
(GCC-compiled) external library expects.
This in turn leads to various crashes when using std::thread
in code compiled with clang, as see e.g. via the ThreadPool
unit tests. See PR 26473 for an example.
llvm-svn: 259931
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| .. | ||
| Attributes.cpp | ||
| Builtins.cpp | ||
| CMakeLists.txt | ||
| CharInfo.cpp | ||
| Diagnostic.cpp | ||
| DiagnosticIDs.cpp | ||
| DiagnosticOptions.cpp | ||
| FileManager.cpp | ||
| FileSystemStatCache.cpp | ||
| IdentifierTable.cpp | ||
| LangOptions.cpp | ||
| Module.cpp | ||
| ObjCRuntime.cpp | ||
| OpenMPKinds.cpp | ||
| OperatorPrecedence.cpp | ||
| SanitizerBlacklist.cpp | ||
| Sanitizers.cpp | ||
| SourceLocation.cpp | ||
| SourceManager.cpp | ||
| TargetInfo.cpp | ||
| Targets.cpp | ||
| TokenKinds.cpp | ||
| Version.cpp | ||
| VersionTuple.cpp | ||
| VirtualFileSystem.cpp | ||
| Warnings.cpp | ||