Fix linking for some users who already have tsan enabled code and are trying to

link it against llvm code, by making our definitions weak. "Some users."

llvm-svn: 144596

1 files changed, 6 insertions, 6 deletions

diff --git a/llvm/lib/Support/Valgrind.cpp b/llvm/lib/Support/Valgrind.cpp
index 078d705183d..46d93a26ef6 100644
--- a/llvm/lib/Support/Valgrind.cpp
+++ b/llvm/lib/Support/Valgrind.cpp
@@ -56,10 +56,10 @@ void llvm::sys::ValgrindDiscardTranslations(const void *Addr, size_t Len) {
 // 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) {}
+LLVM_ATTRIBUTE_WEAK void AnnotateHappensBefore(const char *file, int line,
+                                               const volatile void *cv) {}
+LLVM_ATTRIBUTE_WEAK void AnnotateHappensAfter(const char *file, int line,
+                                              const volatile void *cv) {}
+LLVM_ATTRIBUTE_WEAK void AnnotateIgnoreWritesBegin(const char *file, int line){}
+LLVM_ATTRIBUTE_WEAK void AnnotateIgnoreWritesEnd(const char *file, int line) {}
 }