Allow targets to self-select optimization level in official builds.

build/common.gypi

 # Copyright (c) 2011 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 737 matching lines @@
             # Enable Keystone auto-update support.
             'mac_keystone%': 1,
           }, { # else: branding!="Chrome" or buildtype!="Official"
             'mac_breakpad_uploads%': 0,
             'mac_breakpad%': 0,
             'mac_keystone%': 0,
           }],
         ],
       }],  # OS=="mac"
 
-      # Whether to use multiple cores to compile with visual studio. This is
-      # optional because it sometimes causes corruption on VS 2005.
-      # It is on by default on VS 2008 and off on VS 2005.
       ['OS=="win"', {
         'conditions': [
           ['component=="shared_library"', {
             'win_use_allocator_shim%': 0,
           }],
+          # Whether to use multiple cores to compile with visual studio. This is
+          # optional because it sometimes causes corruption on VS 2005.
+          # It is on by default on VS 2008 and off on VS 2005.
           ['MSVS_VERSION=="2005"', {
             'msvs_multi_core_compile%': 0,
           },{
             'msvs_multi_core_compile%': 1,
           }],
           # Don't do incremental linking for large modules on 32-bit.
           ['MSVS_OS_BITS==32', {
             'msvs_large_module_debug_link_mode%': '1',  # No
           },{
             'msvs_large_module_debug_link_mode%': '2',  # Yes
@@ skipping 701 matching lines @@
         'defines': [
           'NDEBUG',
         ],
         'xcode_settings': {
           'DEAD_CODE_STRIPPING': 'YES',  # -Wl,-dead_strip
           'GCC_OPTIMIZATION_LEVEL': '<(mac_release_optimization)',
           'OTHER_CFLAGS': [ '<@(release_extra_cflags)', ],
         },
         'msvs_settings': {
           'VCCLCompilerTool': {
-            'Optimization': '<(win_release_Optimization)',
+            'conditions': [
+              # In official builds, each target will self-select
+              # an optimization level.
+              ['buildtype!="Official"', {
+                  'Optimization': '<(win_release_Optimization)',
+                },
+              ],
+            ],
             'RuntimeLibrary': '<(win_release_RuntimeLibrary)',
             'conditions': [
               # According to MSVS, InlineFunctionExpansion=0 means
               # "default inlining", not "/Ob0".
               # Thus, we have to handle InlineFunctionExpansion==0 separately.
               ['win_release_InlineFunctionExpansion==0', {
                 'AdditionalOptions': ['/Ob0'],
               }],
               ['win_release_InlineFunctionExpansion!=""', {
                 'InlineFunctionExpansion':
@@ skipping 809 matching lines @@
             'xcode_settings': {
               'OTHER_CFLAGS': [
                 '-fasan',
                 '-faddress-sanitizer',
                 '-w',
               ],
               'OTHER_LDFLAGS': [
                 '-fasan',
                 '-faddress-sanitizer',
                 # The symbols below are referenced in the ASan runtime
-                # library (compiled on OS X 10.6), but may be unavailable 
+                # library (compiled on OS X 10.6), but may be unavailable
                 # on the prior OS X versions. Because Chromium is currently
                 # targeting 10.5.0, we need to explicitly mark these
                 # symbols as dynamic_lookup.
                 '-Wl,-U,_malloc_default_purgeable_zone',
                 '-Wl,-U,_malloc_zone_memalign',
                 '-Wl,-U,_dispatch_sync_f',
                 '-Wl,-U,_dispatch_async_f',
                 '-Wl,-U,_dispatch_barrier_async_f',
                 '-Wl,-U,_dispatch_group_async_f',
                 '-Wl,-U,_dispatch_after_f',
@@ skipping 131 matching lines @@
           '_WINDOWS',
           'NOMINMAX',
           'PSAPI_VERSION=1',
           '_CRT_RAND_S',
           'CERT_CHAIN_PARA_HAS_EXTRA_FIELDS',
           'WIN32_LEAN_AND_MEAN',
           '_ATL_NO_OPENGL',
           '_HAS_TR1=0',
         ],
         'conditions': [
+          ['buildtype=="Official"', {
+              # In official builds, targets can self-select an optimization
+              # level by defining a variable named 'optimize', and setting it
+              # to one of
+              # - "size", optimizes for minimal code size - the default.
+              # - "speed", optimizes for speed over code size.
+              # - "max", whole program optimization and link-time code
+              #   generation. This is very expensive and should be used
+              #   sparingly.
+              'variables': {
+                'optimize%': 'size',
+              },
+              'target_conditions': [
+                ['optimize=="size"', {
+                    'msvs_settings': {
+                      'VCCLCompilerTool': {
+                        # 1, optimizeMinSpace, Minimize Size (/O1)
+                        'Optimization': '1',
+                        # 2, favorSize - Favor small code (/Os)
+                        'FavorSizeOrSpeed': '2',
+                      },
+                    },
+                  },
+                ],
+                ['optimize=="speed"', {
+                    'msvs_settings': {
+                      'VCCLCompilerTool': {
+                        # 2, optimizeMaxSpeed, Maximize Speed (/O2)
+                        'Optimization': '2',
+                        # 1, favorSpeed - Favor fast code (/Ot)
+                        'FavorSizeOrSpeed': '1',
+                      },
+                    },
+                  },
+                ],
+                ['optimize=="max"', {
+                    'msvs_settings': {
+                      'VCCLCompilerTool': {
+                        # 2, optimizeMaxSpeed, Maximize Speed (/O2)
+                        'Optimization': '2',
+                        # 1, favorSpeed - Favor fast code (/Ot)
+                        'FavorSizeOrSpeed': '1',
+                        # This implies link time code generation.
+                        'WholeProgramOptimization': 'true',
+                      },
+                    },
+                  },
+                ],
+              ],
+            },
+          ],
           ['component=="static_library"', {
             'defines': [
               '_HAS_EXCEPTIONS=0',
             ],
           }],
           ['secure_atl', {
             'defines': [
               '_SECURE_ATL',
             ],
           }],
@@ skipping 193 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',
   },
 }