#0 pthread_create tsan_interceptors.cc:705 (exe+0x00000000c790)
#1 main tiny_race.c:9 (exe+0x00000000a3a4)
+``__has_feature(thread_sanitizer)``
+------------------------------------
+
+In some cases one may need to execute different code depending on whether
+ThreadSanitizer is enabled.
+:ref:`\_\_has\_feature <langext-__has_feature-__has_extension>` can be used for
+this purpose.
+
+.. code-block:: c
+
+ #if defined(__has_feature) && __has_feature(thread_sanitizer)
+ // code that builds only under ThreadSanitizer
+ #endif
+
Limitations
-----------
.Case("cxx_exceptions", LangOpts.Exceptions)
.Case("cxx_rtti", LangOpts.RTTI)
.Case("enumerator_attributes", true)
+ .Case("thread_sanitizer", LangOpts.SanitizeThread)
// Objective-C features
.Case("objc_arr", LangOpts.ObjCAutoRefCount) // FIXME: REMOVE?
.Case("objc_arc", LangOpts.ObjCAutoRefCount)
--- /dev/null
+// RUN: %clang_cc1 -E -fsanitize=thread %s -o - | FileCheck --check-prefix=CHECK-TSAN %s
+// RUN: %clang_cc1 -E %s -o - | FileCheck --check-prefix=CHECK-NO-TSAN %s
+
+#if __has_feature(thread_sanitizer)
+int ThreadSanitizerEnabled();
+#else
+int ThreadSanitizerDisabled();
+#endif
+
+// CHECK-TSAN: ThreadSanitizerEnabled
+// CHECK-NO-TSAN: ThreadSanitizerDisabled