Fix integer undefined behavior due to signed left shift overflow in LLVM.

[oota-llvm.git] / lib / Support / Valgrind.cpp

diff --git a/lib/Support/Valgrind.cpp b/lib/Support/Valgrind.cpp
index 078d705183d05b89fe440fc1adf634104f678dec..2b250a357758eddb8fae736eaa94dd8c042d5345 100644 (file)
--- a/lib/Support/Valgrind.cpp
+++ b/lib/Support/Valgrind.cpp
@@ -53,6 +53,7 @@ void llvm::sys::ValgrindDiscardTranslations(const void *Addr, size_t Len) {
 
 #endif  // !HAVE_VALGRIND_VALGRIND_H
 
+#if LLVM_ENABLE_THREADS != 0 && !defined(NDEBUG)
 // These functions require no implementation, tsan just looks at the arguments
 // they're called with.
 extern "C" {
@@ -63,3 +64,4 @@ void AnnotateHappensAfter(const char *file, int line,
 void AnnotateIgnoreWritesBegin(const char *file, int line) {}
 void AnnotateIgnoreWritesEnd(const char *file, int line) {}
 }
+#endif