tsan: add SANITIZER_INTERFACE_ATTRIBUTE to more callbacks

so that it's possible to override them from a dynamic library.

llvm-svn: 200747

compiler-rt/lib/tsan/rtl/tsan_flags.cc

@@ -27,7 +27,8 @@ Flags *flags() {
 #ifdef TSAN_EXTERNAL_HOOKS
 extern "C" const char* __tsan_default_options();
 #else
-extern "C" const char *WEAK __tsan_default_options() {
+extern "C" SANITIZER_INTERFACE_ATTRIBUTE
+const char *WEAK __tsan_default_options() {
   return "";
 }
 #endif

compiler-rt/lib/tsan/rtl/tsan_rtl.cc

@@ -43,9 +43,11 @@ static char ctx_placeholder[sizeof(Context)] ALIGNED(64);
 bool OnFinalize(bool failed);
 void OnInitialize();
 #else
+SANITIZER_INTERFACE_ATTRIBUTE
 bool WEAK OnFinalize(bool failed) {
   return failed;
 }
+SANITIZER_INTERFACE_ATTRIBUTE
 void WEAK OnInitialize() {}
 #endif