Partition libcxx build code from build/config/sanitizers

build/sanitizers/sanitizer_options.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This file contains the default options for various compiler-based dynamic
 // tools.
 
 #include "build/build_config.h"
 
 #if defined(ADDRESS_SANITIZER) && defined(OS_MACOSX)
@@ skipping 64 matching lines @@
     "detect_leaks=0 strip_path_prefix=/../../ fast_unwind_on_fatal=1 "
     "detect_stack_use_after_return=1 "
     "allow_user_segv_handler=1 ";
 #endif  // GOOGLE_CHROME_BUILD
 
 #elif defined(OS_MACOSX)
 const char *kAsanDefaultOptions =
     "check_printf=1 use_sigaltstack=1 "
     "strip_path_prefix=/../../ fast_unwind_on_fatal=1 "
     "detect_stack_use_after_return=1 detect_odr_violation=0 ";
-static const char kNaClDefaultOptions[] = "handle_segv=0";
-static const char kNaClFlag[] = "--type=nacl-loader";
 #endif  // OS_LINUX
 
 #if defined(OS_LINUX) || defined(OS_MACOSX)
+// Allow NaCl to override the default asan options.
+extern const char* kAsanDefaultOptionsNaCl;
+__attribute__((weak)) const char* kAsanDefaultOptionsNaCl = nullptr;
+
 SANITIZER_HOOK_ATTRIBUTE const char *__asan_default_options() {
-#if defined(OS_MACOSX)
-  char*** argvp = _NSGetArgv();
-  int* argcp = _NSGetArgc();
-  if (!argvp || !argcp) return kAsanDefaultOptions;
-  char** argv = *argvp;
-  int argc = *argcp;
-  for (int i = 0; i < argc; ++i) {
-    if (strcmp(argv[i], kNaClFlag) == 0) {
-      return kNaClDefaultOptions;
-    }
-  }
-#endif
+  if (kAsanDefaultOptionsNaCl)
+    return kAsanDefaultOptionsNaCl;
   return kAsanDefaultOptions;
 }
 
 extern char kASanDefaultSuppressions[];
 
 SANITIZER_HOOK_ATTRIBUTE const char *__asan_default_suppressions() {
   return kASanDefaultSuppressions;
 }
 #endif  // OS_LINUX || OS_MACOSX
 #endif  // ADDRESS_SANITIZER
@@ skipping 67 matching lines @@
 // Default options for UndefinedBehaviorSanitizer:
 //   print_stacktrace=1 - print the stacktrace when UBSan reports an error.
 const char kUbsanDefaultOptions[] =
     "print_stacktrace=1 strip_path_prefix=/../../ ";
 
 SANITIZER_HOOK_ATTRIBUTE const char* __ubsan_default_options() {
   return kUbsanDefaultOptions;
 }
 
 #endif  // UNDEFINED_SANITIZER