configure: --v8-options option

Introduce a way to set some v8 flags at compile time, the values should
be separated by comma.

configure

@@ -204,6 +204,12 @@ parser.add_option('--tag',
     dest='tag',
     help='custom build tag')
 
+parser.add_option('--v8-options',
+    action='store',
+    dest='v8_options',
+    help='v8 options to pass, see `node --v8-options` for examples. '
+         'The flags should be separated by a comma')
+
 parser.add_option('--with-arm-float-abi',
     action='store',
     dest='arm_float_abi',
@@ -513,6 +519,12 @@ def configure_node(o):
   else:
     o['variables']['node_tag'] = ''
 
+  if options.v8_options:
+    opts = options.v8_options.split(',')
+    o['variables']['node_v8_options'] = '"' + '","'.join(opts) + '"'
+  else:
+    o['variables']['node_v8_options'] = ''
+
 
 def configure_libz(o):
   o['variables']['node_shared_zlib'] = b(options.shared_zlib)

node.gyp

@@ -13,6 +13,7 @@
     'node_use_openssl%': 'true',
     'node_shared_openssl%': 'false',
     'node_use_mdb%': 'false',
+    'node_v8_options%': '',
     'library_files': [
       'src/node.js',
       'lib/_debugger.js',
@@ -158,6 +159,7 @@
         'ARCH="<(target_arch)"',
         'PLATFORM="<(OS)"',
         'NODE_TAG="<(node_tag)"',
+        'NODE_V8_OPTIONS=<(node_v8_options)',
       ],
 
       'conditions': [

src/node.cc

@@ -3062,6 +3062,26 @@ static void ParseArgs(int* argc,
 }
 
 
+static void SetCompileTimeV8Options(const char** argv) {
+#ifdef NODE_V8_OPTIONS
+  int v8_argc;
+  static const char* v8_argv[] = { NULL, NODE_V8_OPTIONS };
+  if (ARRAY_SIZE(v8_argv) == 1)
+    return;
+
+  v8_argv[0] = argv[0];
+  v8_argc = ARRAY_SIZE(v8_argv);
+  V8::SetFlagsFromCommandLine(&v8_argc, const_cast<char**>(v8_argv), true);
+
+  // Anything that's still in v8_argv is not a V8 or a node option.
+  for (int i = 1; i < v8_argc; i++)
+    fprintf(stderr, "%s: bad option: %s\n", argv[0], v8_argv[i]);
+  if (v8_argc > 1)
+    exit(9);
+#endif  // NODE_V8_OPTIONS
+}
+
+
 // Called from V8 Debug Agent TCP thread.
 static void DispatchMessagesDebugAgentCallback() {
   uv_async_send(&dispatch_debug_messages_async);
@@ -3355,6 +3375,8 @@ void Init(int* argc,
                 DispatchDebugMessagesAsyncCallback);
   uv_unref(reinterpret_cast<uv_handle_t*>(&dispatch_debug_messages_async));
 
+  SetCompileTimeV8Options(argv);
+
   // Parse a few arguments which are specific to Node.
   int v8_argc;
   const char** v8_argv;

src/node.js

@@ -274,7 +274,11 @@
     delete NativeModule._source.config;
 
     // strip the gyp comment line at the beginning
-    config = config.split('\n').slice(1).join('\n').replace(/'/g, '"');
+    config = config.split('\n')
+                   .slice(1)
+                   .join('\n')
+                   .replace(/"/g, '\\"')
+                   .replace(/'/g, '"');
 
     process.config = JSON.parse(config, function(key, value) {
       if (value === 'true') return true;