Build GN with c++11.

tools/gn/bootstrap/bootstrap.py

 #!/usr/bin/env python
 # 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.
 
 """Bootstraps gn.
 
 It is done by first building it manually in a temporary directory, then building
 it with its own BUILD.gn to the final destination.
 """
@@ skipping 114 matching lines @@
   include_dirs = [SRC_ROOT]
   libs = []
 
   if is_posix:
     if options.debug:
       cflags.extend(['-O0', '-g'])
     else:
       cflags.extend(['-O2', '-g0'])
 
     cflags.extend(['-D_FILE_OFFSET_BITS=64', '-pthread', '-pipe'])
-    cflags_cc.extend(['-std=gnu++11', '-Wno-c++11-narrowing'])
+    cflags_cc.extend(['-std=c++11', '-Wno-c++11-narrowing'])
 
   static_libraries = {
       'base': {'sources': [], 'tool': 'cxx'},
       'dynamic_annotations': {'sources': [], 'tool': 'cc'},
       'gn': {'sources': [], 'tool': 'cxx'},
   }
 
   for name in os.listdir(GN_ROOT):
     if not name.endswith('.cc'):
       continue
@@ skipping 297 matching lines @@
     cmd.append('-v')
   cmd.append('gn')
   check_call(cmd)
 
   if not options.debug:
     check_call(['strip', os.path.join(build_dir, 'gn')])
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))