1 files changed, 13 insertions, 0 deletions
diff --git a/lib/Support/Valgrind.cpp b/lib/Support/Valgrind.cpp
index 703448524ed9..2b250a357758 100644
--- a/lib/Support/Valgrind.cpp
+++ b/lib/Support/Valgrind.cpp
@@ -52,3 +52,16 @@ 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" {
+void AnnotateHappensBefore(const char *file, int line,
+                           const volatile void *cv) {}
+void AnnotateHappensAfter(const char *file, int line,
+                          const volatile void *cv) {}
+void AnnotateIgnoreWritesBegin(const char *file, int line) {}
+void AnnotateIgnoreWritesEnd(const char *file, int line) {}
+}
+#endif