ASan: re-enable strict memcmp() checks.

build/sanitizers/sanitizer_options.cc

Index: build/sanitizers/sanitizer_options.cc
diff --git a/build/sanitizers/sanitizer_options.cc b/build/sanitizers/sanitizer_options.cc
index 33090fb94b792a69ac88d550ef396662ea898677..c0bb7f85fc33c30324e4daf22b6ac5a7d2ab0e07 100644
--- a/build/sanitizers/sanitizer_options.cc
+++ b/build/sanitizers/sanitizer_options.cc
@@ -36,8 +36,6 @@ void _sanitizer_options_link_helper() { }
 
 #if defined(ADDRESS_SANITIZER)
 // Default options for AddressSanitizer in various configurations:
-//   strict_memcmp=1 - disable the strict memcmp() checking
-//     (http://crbug.com/178677 and http://crbug.com/178404).
 //   malloc_context_size=5 - limit the size of stack traces collected by ASan
 //     for each malloc/free by 5 frames. These stack traces tend to accumulate
 //     very fast in applications using JIT (v8 in Chrome's case), see
@@ -74,21 +72,21 @@ void _sanitizer_options_link_helper() { }
 // tests on buildbots (which don't set GOOGLE_CHROME_BUILD) or non-official
 // Chromium builds.
 const char kAsanDefaultOptions[] =
-    "legacy_pthread_cond=1 malloc_context_size=5 strict_memcmp=0 "
+    "legacy_pthread_cond=1 malloc_context_size=5 "
     "symbolize=false check_printf=1 use_sigaltstack=1 detect_leaks=0 "
     "strip_path_prefix=Release/../../ fast_unwind_on_fatal=1 "
     "detect_container_overflow=0 ";
 #else
 // Default AddressSanitizer options for buildbots and non-official builds.
 const char *kAsanDefaultOptions =
-    "strict_memcmp=0 symbolize=false check_printf=1 use_sigaltstack=1 "
+    "symbolize=false check_printf=1 use_sigaltstack=1 "
     "detect_leaks=0 strip_path_prefix=Release/../../ fast_unwind_on_fatal=1 "
     "detect_stack_use_after_return=1 detect_container_overflow=0 ";
 #endif  // GOOGLE_CHROME_BUILD
 
 #elif defined(OS_MACOSX)
 const char *kAsanDefaultOptions =
-    "strict_memcmp=0 replace_intrin=0 check_printf=1 use_sigaltstack=1 "
+    "replace_intrin=0 check_printf=1 use_sigaltstack=1 "
     "strip_path_prefix=Release/../../ fast_unwind_on_fatal=1 "
     "detect_stack_use_after_return=1 detect_odr_violation=0 "
     "detect_container_overflow=0 ";
@@ -112,6 +110,12 @@ SANITIZER_HOOK_ATTRIBUTE const char *__asan_default_options() {
 #endif
   return kAsanDefaultOptions;
 }
+
+extern "C" char kASanDefaultSuppressions[];
+
+SANITIZER_HOOK_ATTRIBUTE const char *__asan_default_suppressions() {
+  return kASanDefaultSuppressions;
+}
 #endif  // OS_LINUX || OS_MACOSX
 #endif  // ADDRESS_SANITIZER