Enable debug builds with some optimizations turned on.

build/common.gypi

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 472 matching lines @@
         'cflags': [ '-I/usr/local/include' ],
       }],
       ['OS=="netbsd"', {
         'cflags': [ '-I/usr/pkg/include' ],
       }],
     ],  # conditions
     'configurations': {
       'Debug': {
         'variables': {
           'v8_enable_extra_checks%': 1,
+          'v8_full_debug%': 1,
         },
         'defines': [
           'DEBUG',
           'ENABLE_DISASSEMBLER',
           'V8_ENABLE_CHECKS',
           'OBJECT_PRINT',
           'VERIFY_HEAP',
         ],
-        'msvs_settings': {
-          'VCCLCompilerTool': {
-            'Optimization': '0',
-
-            'conditions': [
-              ['OS=="win" and component=="shared_library"', {
-                'RuntimeLibrary': '3',  # /MDd
-              }, {
-                'RuntimeLibrary': '1',  # /MTd
-              }],
-            ],
-          },
-          'VCLinkerTool': {
-            'LinkIncremental': '2',
-          },
-        },
         'conditions': [
           ['v8_enable_extra_checks==1', {
             'defines': ['ENABLE_EXTRA_CHECKS',],
           }],
+          ['OS=="win"', {
+            'msvs_settings': {

[Jakob Kummerow, 2013/07/09 16:47:07]

Keeping the msvs_settings section where it was saves two levels of indentation.
It's safe to have it outside an OS=="win" conditional, since the section is
ignored by other GYP generators anyway.
I don't feel strongly about this though.

+              'VCCLCompilerTool': {
+                'conditions': [
+                  ['component=="shared_library"', {
+                    'RuntimeLibrary': '3',  # /MDd
+                  }, {
+                    'RuntimeLibrary': '1',  # /MTd
+                  }],
+                  ['v8_full_debug==0', {
+                    'Optimization': '1',
+                  }, {
+                    'Optimization': '0',
+                  }]

[Jakob Kummerow, 2013/07/09 16:47:07]

nit: trailing comma (not necessary for correctness, but we're pretty consistent
about putting it in nevertheless).

+                ],
+              },
+              'VCLinkerTool': {
+                'LinkIncremental': '2',
+              },
+            },
+          }],  # OS=="win"
           ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="netbsd"', {
             'cflags': [ '-Wall', '<(werror)', '-W', '-Wno-unused-parameter',
                         '-Wnon-virtual-dtor', '-Woverloaded-virtual' ],
+            'conditions': [
+              ['v8_full_debug==0', {
+                'cflags': [ '-O1' ],
+              }]

[Jakob Kummerow, 2013/07/09 16:47:07]

nit: trailing comma

+            ],
           }],
           ['OS=="linux" and v8_enable_backtrace==1', {
             # Support for backtrace_symbols.
             'ldflags': [ '-rdynamic' ],
           }],
           ['OS=="android"', {
             'variables': {
               'android_full_debug%': 1,
             },
             'conditions': [
               ['android_full_debug==0', {
                 # Disable full debug if we want a faster v8 in a debug build.
                 # TODO(2304): pass DISABLE_DEBUG_ASSERT instead of hiding DEBUG.
                 'defines!': [
                   'DEBUG',
                 ],
               }],
             ],
           }],
           ['OS=="mac"', {
             'xcode_settings': {
-              'GCC_OPTIMIZATION_LEVEL': '0',  # -O0
+              'conditions': [
+                ['v8_full_debug==0', {
+                  'GCC_OPTIMIZATION_LEVEL': '1',  # -O1
+                }, {
+                  'GCC_OPTIMIZATION_LEVEL': '0',  # -O0
+                }]

[Jakob Kummerow, 2013/07/09 16:47:07]

nit: trailing comma

+              ],
             },
           }],
         ],
       },  # Debug
       'Release': {
         'variables': {
           'v8_enable_extra_checks%': 0,
         },
         'conditions': [
           ['v8_enable_extra_checks==1', {
@@ skipping 50 matching lines @@
           }],  # OS=="mac"
           ['OS=="win"', {
             'msvs_settings': {
               'VCCLCompilerTool': {
                 'Optimization': '2',
                 'InlineFunctionExpansion': '2',
                 'EnableIntrinsicFunctions': 'true',
                 'FavorSizeOrSpeed': '0',
                 'StringPooling': 'true',
                 'conditions': [
-                  ['OS=="win" and component=="shared_library"', {
+                  ['component=="shared_library"', {
                     'RuntimeLibrary': '2',  #/MD
                   }, {
                     'RuntimeLibrary': '0',  #/MT
                   }],
                   ['v8_target_arch=="x64"', {
                     # TODO(2207): remove this option once the bug is fixed.
                     'WholeProgramOptimization': 'true',
                   }],
                 ],
               },
               'VCLinkerTool': {
                 'LinkIncremental': '1',
                 'OptimizeReferences': '2',
                 'EnableCOMDATFolding': '2',
               },
             },
           }],  # OS=="win"
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }