tsan: use attribute instead of compiler flag for tls-model=initial-exec as asked in comments for r203111

llvm-svn: 204232

compiler-rt/lib/tsan/dd/CMakeLists.txt

@@ -4,7 +4,6 @@ include_directories(../..)
 
 set(DD_CFLAGS ${SANITIZER_COMMON_CFLAGS})
 append_no_rtti_flag(DD_CFLAGS)
-list(APPEND DD_CFLAGS -ftls-model=initial-exec)
 
 if("${CMAKE_BUILD_TYPE}" EQUAL "Release")
   set(DD_COMMON_DEFINITIONS DEBUG=0)

compiler-rt/lib/tsan/dd/dd_interceptors.cc

@@ -18,7 +18,9 @@ using namespace __dsan;
 extern "C" void *__libc_malloc(uptr size);
 extern "C" void __libc_free(void *ptr);
 
+__attribute__((tls_model("initial-exec")))
 static __thread Thread *thr;
+__attribute__((tls_model("initial-exec")))
 static __thread volatile int initing;
 static bool inited;
 static uptr g_data_start;