Put the syzygy targets behind a 'syzygy_optimize' flag.

build/common.gypi

 # Copyright (c) 2012 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 500 matching lines @@
       'data_reduction_fallback_host%' : '',
       'data_reduction_dev_host%' : '',
       'spdy_proxy_auth_origin%' : '',
       'spdy_proxy_auth_property%' : '',
       'spdy_proxy_auth_value%' : '',
       'data_reduction_proxy_probe_url%' : '',
       'enable_mdns%' : 0,
       'enable_enhanced_bookmarks%': 0,
       'enable_hangout_services_extension%': 0,
 
+       # Enable the Syzygy optimization step.
+      'syzygy_optimize%': 0,
+
       'conditions': [
         # A flag for POSIX platforms
         ['OS=="win"', {
           'os_posix%': 0,
         }, {
           'os_posix%': 1,
         }],
 
         # A flag for BSD platforms
         ['OS=="freebsd" or OS=="openbsd"', {
@@ skipping 280 matching lines @@
         }, {
           'v8_optimized_debug%': 2,
         }],
 
         # Disable various features by default on embedded.
         ['embedded==1', {
           'remoting%': 0,
           'enable_printing%': 0,
         }],
 
-        # By default, use ICU data file (icudtl.dat) on all platforms
-        # except when building Android WebView.
-        # TODO(jshin): Handle 'use_system_icu' on Linux (Chromium).
+        # By default, use ICU data file (icudtl.dat) on all platforms
+        # except when building Android WebView.
+        # TODO(jshin): Handle 'use_system_icu' on Linux (Chromium).
         ['android_webview_build==0', {
           'icu_use_data_file_flag%' : 1,
         }, {
           'icu_use_data_file_flag%' : 0,
         }],
       ],
 
       # Set this to 1 to enable use of concatenated impulse responses
       # for the HRTF panner in WebAudio.
       'use_concatenated_impulse_responses': 1,
@@ skipping 98 matching lines @@
     'chromium_win_pch%': '<(chromium_win_pch)',
     'configuration_policy%': '<(configuration_policy)',
     'safe_browsing%': '<(safe_browsing)',
     'input_speech%': '<(input_speech)',
     'notifications%': '<(notifications)',
     'clang_use_chrome_plugins%': '<(clang_use_chrome_plugins)',
     'mac_want_real_dsym%': '<(mac_want_real_dsym)',
     'asan%': '<(asan)',
     'asan_coverage%': '<(asan_coverage)',
     'syzyasan%': '<(syzyasan)',
+    'syzygy_optimize%': '<(syzygy_optimize)',
     'lsan%': '<(lsan)',
     'msan%': '<(msan)',
     'msan_blacklist%': '<(msan_blacklist)',
     'tsan%': '<(tsan)',
     'tsan_blacklist%': '<(tsan_blacklist)',
     'use_instrumented_libraries%': '<(use_instrumented_libraries)',
     'use_custom_libcxx%': '<(use_custom_libcxx)',
     'clang_type_profiler%': '<(clang_type_profiler)',
     'order_profiling%': '<(order_profiling)',
     'order_text_section%': '<(order_text_section)',
@@ skipping 329 matching lines @@
     'disable_glibcxx_debug%': 0,
 
     # Set to 1 to compile with the hole punching for the protected video.
     'video_hole%': 0,
 
     # Enable a new Gamepad interface. This is temporary and should go
     # away once the chrome and blink interfaces are in sync
     'enable_new_gamepad_api%': 1,
 
     'conditions': [
+      # Enable the Syzygy optimization step for the official builds.
+      ['OS=="win" and buildtype=="Official" and syzyasan!=1', {
+        'syzygy_optimize%': 1,

[scottmg, 2014/03/18 17:21:13]

I'm not sure if this setting gets copied out? But I guess it's working?

[Sébastien Marchand, 2014/03/18 18:25:00]

Yeah it works, I guess that it's because it's the last place where I set it in
this file... Not super elegant but I don't know if there's a better solution.

+      }, {
+        'syzygy_optimize%': 0,
+      }],
+
       # The version of GCC in use, set later in platforms that use GCC and have
       # not explicitly chosen to build with clang. Currently, this means all
       # platforms except Windows, Mac and iOS.
       # TODO(glider): set clang to 1 earlier for ASan and TSan builds so that
       # it takes effect here.
       ['os_posix==1 and OS!="mac" and OS!="ios" and clang==0 and asan==0 and lsan==0 and tsan==0 and msan==0', {
         'conditions': [
           ['OS=="android"', {
             # We directly set the gcc_version since we know what we use.
             'gcc_version%': 46,
@@ skipping 3722 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',
   },
 }