Enable use-after-scope check in ASAN configs.

build/config/sanitizers/BUILD.gn

 # 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.
 
 import("//build_overrides/build.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/clang/clang.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/toolchain/toolchain.gni")
@@ skipping 182 matching lines @@
 config("default_sanitizer_ldflags") {
   visibility = [
     ":default_sanitizer_flags",
     ":deps",
   ]
 
   if (is_posix) {
     ldflags = []
     if (is_asan) {
       ldflags += [ "-fsanitize=address" ]
+      if (!is_mac) {

[achuithb, 2017/01/21 01:00:40]

Also not chromeos

+        ldflags += [ "-fsanitize-address-use-after-scope" ]
+      }
     }
     if (is_lsan) {
       ldflags += [ "-fsanitize=leak" ]
     }
     if (is_tsan) {
       ldflags += [ "-fsanitize=thread" ]
     }
     if (is_msan) {
       ldflags += [ "-fsanitize=memory" ]
     }
@@ skipping 89 matching lines @@
       "-isystem" + rebase_path("$prefix/libc++/$include", root_build_dir),
       "-isystem" + rebase_path("$prefix/libc++abi/$include", root_build_dir),
     ]
   }
 }
 
 config("asan_flags") {
   cflags = []
   if (is_asan) {
     cflags += [ "-fsanitize=address" ]
+    if (!is_mac) {
+      cflags += [ "-fsanitize-address-use-after-scope" ]
+    }
     if (!asan_globals) {
       cflags += [
         "-mllvm",
         "-asan-globals=0",
       ]
     }
     if (is_win) {
       if (!defined(asan_win_blacklist_path)) {
         asan_win_blacklist_path =
             rebase_path("//tools/memory/asan/blacklist_win.txt", root_build_dir)
@@ skipping 238 matching lines @@
 # This allows to selectively disable ubsan_vptr, when needed. In particular,
 # if some third_party code is required to be compiled without rtti, which
 # is a requirement for ubsan_vptr.
 config("default_sanitizer_flags_but_ubsan_vptr") {
   configs = all_sanitizer_configs - [ ":ubsan_vptr_flags" ]
 }
 
 config("default_sanitizer_flags_but_coverage") {
   configs = all_sanitizer_configs - [ ":coverage_flags" ]
 }