linux: add a use_gold flag that defaults to on

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 369 matching lines @@
         ['OS=="win" and MSVS_VERSION=="2010"', {
           'chromium_win_pch%': 1
         }],
 
         ['use_aura==1 or chromeos==1', {
           'enable_plugin_installation%': 0,
         }, {
           'enable_plugin_installation%': 1,
         }],
 
-        # Set to 0 to not use third_party/gold as the linker.
+        # linux_use_gold_binary: whether to use the binary checked into
+        # third_party/gold.
+        # linux_use_gold_flags: whether to use build flags that rely on gold.
         # On by default for x64 Linux.
         ['host_arch=="x64"', {
           'linux_use_gold_binary%': 1,
+          'linux_use_gold_flags%': 1,
         }, {
           'linux_use_gold_binary%': 0,
+          'linux_use_gold_flags%': 0,
         }],
 
         # Enable canvas_skia_skia.cc incrementally on different platforms.
         # http://crbug.com/105550
         ['OS=="win"', {
           'use_canvas_skia_skia%': 1,
         }],
       ],
     },
 
@@ skipping 47 matching lines @@
     'input_speech%': '<(input_speech)',
     'notifications%': '<(notifications)',
     'clang_use_chrome_plugins%': '<(clang_use_chrome_plugins)',
     'asan%': '<(asan)',
     'order_text_section%': '<(order_text_section)',
     'enable_register_protocol_handler%': '<(enable_register_protocol_handler)',
     'enable_web_intents%': '<(enable_web_intents)',
     'enable_web_intents_tag%': '<(enable_web_intents_tag)',
     'enable_plugin_installation%': '<(enable_plugin_installation)',
     'linux_use_gold_binary%': '<(linux_use_gold_binary)',
+    'linux_use_gold_flags%': '<(linux_use_gold_flags)',
     'use_canvas_skia_skia%': '<(use_canvas_skia_skia)',
     # Whether to build for Wayland display server
     'use_wayland%': 0,
 
     # Use system yasm instead of bundled one.
     'use_system_yasm%': 0,
 
     # Default to enabled PIE; this is important for ASLR but we need to be
     # able to turn it off for remote debugging on Chromium OS
     'linux_disable_pie%': 0,
@@ skipping 151 matching lines @@
     # Enable a variable used elsewhere throughout the GYP files to determine
     # whether to compile in the sources for the GPU plugin / process.
     'enable_gpu%': 1,
 
     # .gyp files or targets 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.
     'chromium_code%': 0,
 
+    'release_valgrind_build%': 0,
+
     # TODO(thakis): Make this a blacklist instead, http://crbug.com/101600
     'enable_wexit_time_destructors%': 0,
 
     # Set to 1 to compile with the built in pdf viewer.
     'internal_pdf%': 0,
 
     # This allows to use libcros from the current system, ie. /usr/lib/
     # The cros_api will be pulled in as a static library, and all headers
     # from the system include dirs.
     'system_libcros%': 0,
@@ skipping 351 matching lines @@
 
       # VS inserts quite a lot of extra checks to algorithms like
       # std::partial_sort in Debug build which make them O(N^2)
       # instead of O(N*logN). This is particularly slow under memory
       # tools like ThreadSanitizer so we want it to be disablable.
       # See http://msdn.microsoft.com/en-us/library/aa985982(v=VS.80).aspx
       'win_debug_disable_iterator_debugging%': '0',
 
       'release_extra_cflags%': '',
       'debug_extra_cflags%': '',
-      'release_valgrind_build%': 0,
+
+      'release_valgrind_build%': '<(release_valgrind_build)',
 
       # the non-qualified versions are widely assumed to be *nix-only
       'win_release_extra_cflags%': '',
       'win_debug_extra_cflags%': '',
 
       # TODO(thakis): Make this a blacklist instead, http://crbug.com/101600
       'enable_wexit_time_destructors%': '<(enable_wexit_time_destructors)',
 
       # Only used by Windows build for now.  Can be used to build into a
       # differet output directory, e.g., a build_dir_prefix of VS2010_ would
@@ skipping 702 matching lines @@
                 'cflags!': [
                   '-fno-ident',
                 ],
               }],
               ['profiling==1', {
                 'cflags': [
                   '-fno-omit-frame-pointer',
                   '-g',
                 ],
               }],
-              # At gyp time, we test the linker for ICF support; this flag
-              # is then provided to us by gyp.  (Currently only gold supports
-              # an --icf flag.)
-              # There seems to be a conflict of --icf and -pie in gold which
-              # can generate crashy binaries. As a security measure, -pie
-              # takes precendence for now.
-              ['LINKER_SUPPORTS_ICF==1 and release_valgrind_build==0', {
-                'target_conditions': [
-                  ['_toolset=="target"', {
-                    'ldflags': [
-                      #'-Wl,--icf=safe',
-                      '-Wl,--icf=none',
-                    ]
-                  }]
-                ]
-              }],
-            ]
+            ],
           },
         },
         'variants': {
           'coverage': {
             'cflags': ['-fprofile-arcs', '-ftest-coverage'],
             'ldflags': ['-fprofile-arcs'],
           },
           'profile': {
             'cflags': ['-pg', '-g'],
             'ldflags': ['-pg'],
@@ skipping 245 matching lines @@
             'variables': {'linux_use_tcmalloc%': 1},
             'defines': ['USE_HEAPCHECKER'],
           }],
           ['linux_use_tcmalloc==0', {
             'defines': ['NO_TCMALLOC'],
           }],
           ['linux_keep_shadow_stacks==1', {
             'defines': ['KEEP_SHADOW_STACKS'],
             'cflags': ['-finstrument-functions'],
           }],
+          ['linux_use_gold_flags==1', {
+            'conditions': [
+              ['release_valgrind_build==0', {
+                'target_conditions': [
+                  ['_toolset=="target"', {
+                    'ldflags': [
+                      # There seems to be a conflict of --icf and -pie
+                      # in gold which can generate crashy binaries. As
+                      # a security measure, -pie takes precendence for
+                      # now.
+                      #'-Wl,--icf=safe',
+                      '-Wl,--icf=none',
+                    ],
+                  }],
+                ],
+              }],
+            ],
+          }],
           ['linux_use_gold_binary==1', {
             'variables': {
               # We pass the path to gold to the compiler.  gyp leaves
               # unspecified what the cwd is when running the compiler,
               # so the normal gyp path-munging fails us.  This hack
               # gets the right path.
               'gold_path': '<(PRODUCT_DIR)/../../third_party/gold',
             },
             'ldflags': [
               # Put our gold binary in the search path for the linker.
@@ skipping 757 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',
   },
 }