Start of code coverage for Mac....

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.
     'chromium_code%': 0,
 
     # Variables expected to be overriden on the GYP command line (-D) or by
     # ~/.gyp/include.gypi.
 
     # Override chromium_mac_pch and set it to 0 to suppress the use of
     # precompiled headers on the Mac.  Prefix header injection may still be
     # used, but prefix headers will not be precompiled.  This is useful when
     # using distcc to distribute a build to compile slaves that don't
     # share the same compiler executable as the system driving the compilation,
     # because precompiled headers rely on pointers into a specific compiler
     # executable's image.  Setting this to 0 is needed to use an experimental
     # Linux-Mac cross compiler distcc farm.
     'chromium_mac_pch%': 1,
 
     # Override branding to select the desired branding flavor.
     'branding%': 'Chromium',
+
+    # Set to 1 to enable code coverage.  In addition to build changes
+    # (e.g. extra CFLAGS), also creates a new target in the src/chrome
+    # project file called "coverage".
+    # Currently ignored on Windows.
+    'coverage%': 0,
   },
   'target_defaults': {
     'conditions': [
       ['branding=="Chrome"', {
         'defines': ['GOOGLE_CHROME_BUILD'],
       }, {  # else: branding!="Chrome"
         'defines': ['CHROMIUM_BUILD'],
       }],
+      ['coverage!=0', {
+        'conditions': [
+          ['OS=="mac"', {
+            'xcode_settings': {
+              'GCC_INSTRUMENT_PROGRAM_FLOW_ARCS': 'YES',
+              'GCC_GENERATE_TEST_COVERAGE_FILES': 'YES',
+            },
+            # Add -lgcov for executables, not for static_libraries.
+            # This is a delayed conditional.
+            'target_conditions': [
+              ['_type=="executable"', {
+                'xcode_settings': { 'OTHER_LDFLAGS': [ '-lgcov' ] },
+              }],
+            ],
+          }],
+          # TODO(jrg): complete this work once Linux transitions to gyp.
+          # This is untested (--> likely doesn't work).
+          ['OS=="linux"', {
+            'cflags': [ '-ftest-coverage',
+                        '-fprofile-arcs' ],
+            'target_conditions': [
+              ['_type=="executable"', {
+                'link_settings': { 'libraries': [ '-lgcov' ] },
+              }],
+            ],
+          }],
+        ]},
+      # TODO(jrg): options for code coverage on Windows
+      ],
     ],
     'default_configuration': 'Debug',
     'configurations': {
       'Debug': {
         'conditions': [
           [ 'OS=="mac"', {
             'xcode_settings': {
               'COPY_PHASE_STRIP': 'NO',
               'GCC_OPTIMIZATION_LEVEL': '0',
             }
@@ skipping 288 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',
   },
 }