import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

mozglue/build/AsanOptions.cpp

@@ -0,0 +1,35 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/Attributes.h"
+
+#ifndef _MSC_VER // Not supported by clang-cl yet
+
+// When running with AddressSanitizer, we need to explicitly set some
+// options specific to our codebase to prevent errors during runtime.
+// To override these, set the ASAN_OPTIONS environment variable.
+//
+// Currently, these are:
+//
+//   allow_user_segv_handler=1 - Tell ASan to allow our code to use its
+//   own SIGSEGV handlers. This is required by ASM.js internally.
+//
+//   alloc_dealloc_mismatch=0 - Disable alloc-dealloc mismatch checking
+//   in ASan. This is required because we define our own new/delete
+//   operators that are backed by malloc/free. If one of them gets inlined
+//   while the other doesn't, ASan will report false positives.
+//
+//   detect_leaks=0 - Disable LeakSanitizer. This is required because
+//   otherwise leak checking will be enabled for various building and
+//   testing executables where we don't care much about leaks. Enabling
+//   this will also likely require setting LSAN_OPTIONS with a suppression
+//   file, as in build/sanitizers/lsan_suppressions.txt.
+//
+extern "C" MOZ_ASAN_BLACKLIST
+const char* __asan_default_options() {
+    return "allow_user_segv_handler=1:alloc_dealloc_mismatch=0:detect_leaks=0";
+}
+
+#endif