Add build configuration variable 'c_frame_pointers' to control whether or not frame pointers are in…

tools/gyp/configurations_xcode.gypi

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # The purpose of this file and others in this directory is to simulate
 # the Chromium build enviroment. This file is included in all GYP
 # files that are used by the Dart project.
 
 # READ BEFORE EDITING:
 # Do not add Dart VM specific configuration to this file. Instead,
@@ skipping 11 matching lines @@
           'GCC_VERSION': '<(xcode_gcc_version)',
           'GCC_C_LANGUAGE_STANDARD': 'ansi',
           'GCC_ENABLE_CPP_EXCEPTIONS': 'NO', # -fno-exceptions
           'GCC_ENABLE_CPP_RTTI': 'NO', # -fno-rtti
           'GCC_DEBUGGING_SYMBOLS': 'default', # -g
           'GCC_GENERATE_DEBUGGING_SYMBOLS': 'YES', # Do not strip symbols
           'GCC_SYMBOLS_PRIVATE_EXTERN': 'YES', # -fvisibility=hidden
           'GCC_INLINES_ARE_PRIVATE_EXTERN': 'YES', # -fvisibility-inlines-hidden
           'GCC_WARN_NON_VIRTUAL_DESTRUCTOR': 'YES', # -Wnon-virtual-dtor
           'GCC_TREAT_WARNINGS_AS_ERRORS': 'YES', # -Werror
-          'OTHER_CFLAGS': [ # Disable frame pointers by default.
-            '-fomit-frame-pointer',
-            '-momit-leaf-frame-pointer',
-          ],
           'WARNING_CFLAGS': [
             '<@(common_gcc_warning_flags)',
             '-Wtrigraphs', # Disable Xcode default.
             '-Wreturn-type',
             '-Werror=return-type',
             # TODO(15922): Enable this flag by default.
             # '-Wshorten-64-to-32',
           ],
 
           # Generate PIC code as Chrome is switching to this.
           'GCC_DYNAMIC_NO_PIC': 'NO',
 
           # When searching for header files, do not search
           # subdirectories. Without this option, vm/assert.h conflicts
           # with the system header assert.h. Apple also recommend
           # setting this to NO.
           'ALWAYS_SEARCH_USER_PATHS': 'NO',
 
           # Attempt to remove compiler options that Xcode adds by default.
           'GCC_CW_ASM_SYNTAX': 'NO', # Remove -fasm-blocks.
 
           'GCC_ENABLE_PASCAL_STRINGS': 'NO',
           'GCC_ENABLE_TRIGRAPHS': 'NO',
           'COMBINE_HIDPI_IMAGES': 'YES',
         },
+        'conditions': [
+          ['c_frame_pointers==1', {
+            'xcode_settings': {
+              'OTHER_CFLAGS': [
+                '-fno-omit-frame-pointer',
+                '-mno-omit-leaf-frame-pointer',
+              ],
+            },
+            'defines': [
+              'PROFILE_NATIVE_CODE',
+            ],
+          }, {
+            'xcode_settings': {
+              'OTHER_CFLAGS': [
+                '-fomit-frame-pointer',
+                '-momit-leaf-frame-pointer',
+              ],
+            },
+          }],
+        ],
       },
       'Dart_Macos_ia32_Base': {
         'abstract': 1,
       },
       'Dart_Macos_x64_Base': {
         'abstract': 1,
       },
       'Dart_Macos_simarm_Base': {
         'abstract': 1,
       },
       'Dart_Macos_simarm64_Base': {
         'abstract': 1,
       },
       'Dart_Macos_simmips_Base': {
         'abstract': 1,
       },
       'Dart_Macos_Debug': {
         'abstract': 1,
       },
       'Dart_Macos_Release': {
         'abstract': 1,
       },
     },
   },
 }