Add a postbuild action for executables built with ASan on Mac OS.

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 3403 matching lines @@
               },
             ],
             'conditions': [
               ['asan==1', {
                 'variables': {
                  'asan_saves_file': 'asan.saves',
                 },
                 'xcode_settings': {
                   'CHROMIUM_STRIP_SAVE_FILE': '<(asan_saves_file)',
                 },
+                'postbuilds': [
+                  {
+                    # For executables built with ASan, copies the runtime lib
+                    # (libclang_rt.asan_osx_dynamic.dylib) on which they depend
+                    # from the compiler installation path to the build dir and
+                    # fixes the dylib's install name in the binary to be
+                    # relative to @executable_path. This is needed if the
+                    # executables are copied to a different machine (the ASan
+                    # runtime library must be copied in this case as well).
+                    'variables': {
+                      # Define change_mach_o_flags in a variable ending in _path

[Mark Mentovai, 2012/12/19 13:53:38]

If you’re using this, fix the comment.

+                      # so that GYP understands it's a path and performs proper
+                      # relativization during dict merging.
+                      'copy_asan_runtime_dylib_path':
+                          'mac/copy_asan_runtime_dylib.sh',
+                      'copy_asan_runtime_dylib_options%': [
+                      ],
+                    },
+                    'postbuild_name': 'Copy ASan runtime dylib',
+                    'action': [
+                      '<(copy_asan_runtime_dylib_path)',
+                      '>@(copy_asan_runtime_dylib_options)',
+                    ],
+                  },
+                ],
               }],
             ],
             'target_conditions': [
               ['mac_pie==1 and release_valgrind_build==0', {
                 # Turn on position-independence (ASLR) for executables. When
                 # PIE is on for the Chrome executables, the framework will
                 # also be subject to ASLR.
                 # Don't do this when building for Valgrind, because Valgrind
                 # doesn't understand slide. TODO: Make Valgrind on Mac OS X
                 # understand slide, and get rid of the Valgrind check.
@@ skipping 486 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',
   },
 }