Build for Mac in the Release configuration at -O2

build/common.gypi

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     # .gyp files should set chromium_code to 1 if they build Chromium-specific
     # code, as opposed to external code.  This variable is used to control
     # such things as the set of warnings to enable, and whether warnings are
     # treated as errors.
@@ skipping 142 matching lines @@
           ['MSVS_OS_BITS==32', {
             'msvs_large_module_debug_link_mode%': '1',  # No
           },{
             'msvs_large_module_debug_link_mode%': '2',  # Yes
           }],
         ],
       }],
     ],
   },
   'target_defaults': {
+    'variables': {
+      'mac_release_optimization%': '2'  # Use -O2 unless overridden
+    },
     'conditions': [
       ['branding=="Chrome"', {
         'defines': ['GOOGLE_CHROME_BUILD'],
         'conditions': [
           ['OS=="linux"', {
             'cflags': [ '-gstabs' ],
           }],
         ],
       }, {  # else: branding!="Chrome"
         'defines': ['CHROMIUM_BUILD'],
@@ skipping 44 matching lines @@
       }],  # coverage!=0
     ],  # conditions for 'target_defaults'
     'default_configuration': 'Debug',
     'configurations': {
        # VCLinkerTool LinkIncremental values below:
        #   0 == default
        #   1 == /INCREMENTAL:NO
        #   2 == /INCREMENTAL
        # Debug links incremental, Release does not.
       'Debug': {
+        'xcode_settings': {
+          'COPY_PHASE_STRIP': 'NO',
+          'GCC_OPTIMIZATION_LEVEL': '0',  # -O0
+        },
         'conditions': [
-          [ 'OS=="mac"', {
-            'xcode_settings': {
-              'COPY_PHASE_STRIP': 'NO',
-              'GCC_OPTIMIZATION_LEVEL': '0',  # -O0
-            }
-          }],
           [ 'OS=="win"', {
             'configuration_platform': 'Win32',
             'msvs_configuration_attributes': {
               'OutputDirectory': '$(SolutionDir)$(ConfigurationName)',
               'IntermediateDirectory': '$(OutDir)\\obj\\$(ProjectName)',
               'CharacterSet': '1',
             },
             'msvs_settings': {
               'VCCLCompilerTool': {
                 'Optimization': '0',
                 'PreprocessorDefinitions': ['_DEBUG'],
                 'BasicRuntimeChecks': '3',
                 'RuntimeLibrary': '1',
               },
               'VCLinkerTool': {
                 'LinkIncremental': '<(msvs_debug_link_incremental)',
               },
               'VCResourceCompilerTool': {
                 'PreprocessorDefinitions': ['_DEBUG'],
               },
             },
           }],
         ],
       },
       'Release': {
         'defines': [
           'NDEBUG',
         ],
+        'xcode_settings': {
+          'DEAD_CODE_STRIPPING': 'YES',  # -Wl,-dead_strip
+          'GCC_OPTIMIZATION_LEVEL': '<(mac_release_optimization)',
+        },
         'conditions': [
-          [ 'OS=="mac"', {
-            'xcode_settings': {
-              'DEAD_CODE_STRIPPING': 'YES',  # -Wl,-dead_strip
-              'conditions': [
-                ['mac_release_optimization != "UNSET"',
-                  {'GCC_OPTIMIZATION_LEVEL': '<(mac_release_optimization)'}],
-              ],
-            }
-          }],
           [ 'OS=="win" and msvs_use_common_release', {
             'configuration_platform': 'Win32',
             'msvs_props': ['release.vsprops'],
           }],
           [ 'OS=="win"', {
             'msvs_configuration_attributes': {
               'OutputDirectory': '$(SolutionDir)$(ConfigurationName)',
               'IntermediateDirectory': '$(OutDir)\\obj\\$(ProjectName)',
               'CharacterSet': '1',
             },
@@ skipping 264 matching lines @@
         ],
       },
     }],
     ['OS=="mac"', {
       'target_defaults': {
         'variables': {
           # This should be 'mac_real_dsym%', but there seems to be a bug
           # with % in variables that are intended to be set to different
           # values in different targets, like this one.
           'mac_real_dsym': 0,  # Fake .dSYMs are fine in most cases.
-          # Release defaults to the Xcode optimization default, this var
-          # lets you force the value.
-          'mac_release_optimization%': 'UNSET'
         },
         'mac_bundle': 0,
         'xcode_settings': {
           'ALWAYS_SEARCH_USER_PATHS': 'NO',
           'GCC_C_LANGUAGE_STANDARD': 'c99',         # -std=c99
           '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
@@ skipping 196 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }