Enable threadsafe static initialization (aka 'magic statics')

build/config/compiler/BUILD.gn

 # Copyright (c) 2013 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/config/android/config.gni")
 import("//build/config/chrome_build.gni")
 if (current_cpu == "arm") {
   import("//build/config/arm.gni")
 }
 if (current_cpu == "mipsel" || current_cpu == "mips64el") {
@@ skipping 67 matching lines @@
   cflags = []
   cflags_c = []
   cflags_cc = []
   ldflags = []
   defines = []
 
   # Common GCC compiler flags setup.
   # --------------------------------
   cflags += [ "-fno-strict-aliasing" ]  # See http://crbug.com/32204
   cflags_cc += [
-    "-fno-threadsafe-statics",
-
     # Not exporting C++ inline functions can generally be applied anywhere
     # so we do so here. Normal function visibility is controlled by
     # //build/config/gcc:symbol_visibility_hidden.
     "-fvisibility-inlines-hidden",
   ]
 
   # Stack protection.
   if (is_mac) {
     cflags += [ "-fstack-protector-all" ]
   } else if (is_linux) {
@@ skipping 1019 matching lines @@
   if (symbol_level == 0) {
     configs = [ ":no_symbols" ]
   } else if (symbol_level == 1) {
     configs = [ ":minimal_symbols" ]
   } else if (symbol_level == 2) {
     configs = [ ":symbols" ]
   } else {
     assert(false)
   }
 }