Fix standalone build on Linux and Mac.

build/standalone.gypi

 # Copyright 2014 PDFium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Definitions to be used when building stand-alone PDFium binaries.
 
 {
   'variables': {
     'component%': 'static_library',
     'clang%': 0,
@@ skipping 129 matching lines @@
         'msvs_configuration_platform': 'x64',
       },
     },
     'defines!': [
       'DEBUG',
     ],
     'cflags': [
       '-Wall',
       '-W',
       '-Wno-unused-parameter',
-      '-pthread', '-fno-exceptions',
+      '-pthread',
+      '-fno-exceptions',
       '-fvisibility=hidden',
+      '-std=gnu++0x',
     ],
     'cflags_cc': [
       '-Wnon-virtual-dtor',
       '-fno-rtti',
     ],
     'ldflags': [
       '-pthread',
     ],
     'msvs_cygwin_dirs': ['<(DEPTH)/v8/third_party/cygwin'],
     'msvs_configuration_attributes': {
@@ skipping 30 matching lines @@
         'LinkIncremental': '1',
         # SubSystem values:
         #   0 == not set
         #   1 == /SUBSYSTEM:CONSOLE
         #   2 == /SUBSYSTEM:WINDOWS
         'SubSystem': '1',
       },
     },
     'xcode_settings': {
       'ALWAYS_SEARCH_USER_PATHS': 'NO',
+      'CLANG_CXX_LANGUAGE_STANDARD': 'gnu++11',
       'GCC_CW_ASM_SYNTAX': 'NO',                # No -fasm-blocks
       'GCC_DYNAMIC_NO_PIC': 'NO',               # No -mdynamic-no-pic
                                                 # (Equivalent to -fPIC)
       'GCC_ENABLE_CPP_EXCEPTIONS': 'NO',        # -fno-exceptions
       'GCC_ENABLE_CPP_RTTI': 'NO',              # -fno-rtti
       'GCC_ENABLE_PASCAL_STRINGS': 'NO',        # No -mpascal-strings
       # GCC_INLINES_ARE_PRIVATE_EXTERN maps to -fvisibility-inlines-hidden
       'GCC_INLINES_ARE_PRIVATE_EXTERN': 'YES',
       'GCC_SYMBOLS_PRIVATE_EXTERN': 'YES',      # -fvisibility=hidden
       'GCC_TREAT_WARNINGS_AS_ERRORS': 'NO',     # -Werror
@@ skipping 41 matching lines @@
           }],
         ],  # target_conditions
       },  # target_defaults
     }],  # OS=="mac"
   ],
   'xcode_settings': {
     # See comment in Chromium's common.gypi for why this is needed.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   }
 }