This CL adds support for extension in GYP.

pylib/gyp/xcode_emulation.py

Index: pylib/gyp/xcode_emulation.py
diff --git a/pylib/gyp/xcode_emulation.py b/pylib/gyp/xcode_emulation.py
index 859cd5a93722e9c1efb9f4cb210be180e03e7b11..c3d3aee899ec2c7bed60db5a099abddbfe6527ad 100644
--- a/pylib/gyp/xcode_emulation.py
+++ b/pylib/gyp/xcode_emulation.py
@@ -218,6 +218,9 @@ class XcodeSettings(object):
   def _IsBundle(self):
     return int(self.spec.get('mac_bundle', 0)) != 0
 
+  def _IsIosAppExtension(self):
+    return int(self.spec.get('ios_app_extension', 0)) != 0

[Mark Mentovai, 2014/07/09 18:02:52]

You can require (assert) that _IsBundle is true if this returns true, also. Or
you may wish to do check it in GetProductType at line 302.

[olivierrobin, 2014/07/10 09:31:51]

Done on line 302

On 2014/07/09 18:02:52, Mark Mentovai wrote:

+
   def GetFrameworkVersion(self):
     """Returns the framework version of the current target. Only valid for
     bundles."""
@@ -237,7 +240,10 @@ class XcodeSettings(object):
           'WRAPPER_EXTENSION', default=default_wrapper_extension)
       return '.' + self.spec.get('product_extension', wrapper_extension)
     elif self.spec['type'] == 'executable':
-      return '.' + self.spec.get('product_extension', 'app')
+      if self._IsIosAppExtension:
+        return '.' + self.spec.get('product_extension', 'appex')
+      else:
+        return '.' + self.spec.get('product_extension', 'app')
     else:
       assert False, "Don't know extension for '%s', target '%s'" % (
           self.spec['type'], self.spec['target_name'])
@@ -292,6 +298,8 @@ class XcodeSettings(object):
 
   def GetProductType(self):
     """Returns the PRODUCT_TYPE of this target."""
+    if self._IsIosAppExtension():
+      return 'com.apple.product-type.app-extension'
     if self._IsBundle():
       return {
         'executable': 'com.apple.product-type.application',
@@ -794,6 +802,16 @@ class XcodeSettings(object):
     for directory in framework_dirs:
       ldflags.append('-F' + directory.replace('$(SDKROOT)', sdk_root))
 
+    if sdk_root and self._IsIosAppExtension():
+      # Adds the link flags for extensions. These flags are common for all
+      # extensions and provide loader and main function.
+      # These flags reflect the compilation options used by xcode to compile
+      # extensions.
+      ldflags.append('-lpkstart ' + sdk_root +

[Mark Mentovai, 2014/07/09 18:02:52]

Some of the other flags in here set a bad example, but let’s not continue the
practice.

-lpkstart should be a separate argument from os.path.join(sdk_root,
'…path/to/PlugInKit').

[olivierrobin, 2014/07/10 09:31:51]

Done.

[olivierrobin, 2014/07/10 09:31:51]

Done.

+          '/System/Library/PrivateFrameworks/PlugInKit.framework/PlugInKit')
+      ldflags.append('-fapplication-extension ' +

[Mark Mentovai, 2014/07/09 18:02:51]

And these should be 5 separate arguments.

[olivierrobin, 2014/07/10 09:31:51]

I separated fapplication-extension from the others, but it seems that you cannot
have twice the same flag, meaning that if I separate both -Xlinker, I get it
only once and the linking fail.

As you may have more than one rpath, it seems required to put the four arguments
in the same flag.

+          '-Xlinker -rpath -Xlinker @executable_path/../../Frameworks')
+
     self._Appendf(ldflags, 'CLANG_CXX_LIBRARY', '-stdlib=%s')
 
     self.configname = None
@@ -921,7 +939,7 @@ class XcodeSettings(object):
     """Return a shell command to codesign the iOS output binary so it can
     be deployed to a device.  This should be run as the very last step of the
     build."""
-    if not (self.isIOS and self.spec['type'] == "executable"):
+    if not (self.isIOS and self.spec['type'] == 'executable'):
       return []
 
     settings = self.xcode_settings[configname]