add FOLLY_SANITIZE macro

Summary: Most of the time we want to guard some code when any of the sanitizers are enabled not just one.

Reviewed By: yfeldblum

Differential Revision: D6429720

fbshipit-source-id: 7157a0a13f2b2acabd36a19c61b9fdbf38ba96b8

folly/CPortability.h

@@ -93,6 +93,15 @@
 # define FOLLY_SANITIZE_THREAD 1
 #endif
 
+/**
+ * Define a convenience macro to test when ASAN, UBSAN or TSAN sanitizer are
+ * being used
+ */
+#if defined(FOLLY_SANITIZE_ADDRESS) || defined(FOLLY_SANITIZE_THREAD) || \
+    defined(UNDEFINED_SANITIZER)
+#define FOLLY_SANITIZE 1
+#endif
+
 /**
  * ASAN/MSAN/TSAN define pre-processor symbols:
  * ADDRESS_SANITIZER/MEMORY_SANITIZER/THREAD_SANITIZER.

folly/Portability.h

@@ -199,6 +199,12 @@ constexpr bool kIsSanitizeThread = true;
 #else
 constexpr bool kIsSanitizeThread = false;
 #endif
+
+#if FOLLY_SANITIZE
+constexpr bool kIsSanitize = true;
+#else
+constexpr bool kIsSanitize = false;
+#endif
 } // namespace folly
 
 // packing is very ugly in msvc