msbarnett on Mountain Lion seems to have addressed the memory management issues in OS X

Comment on Mountain Lion seems to have addressed the memory management issues in OS X parent

You can just use otool to dump the Objective-C information out of the MachO executable:

     otool -o /Applications/Xcode.app/Contents/MacOS/Xcode
     .....
     Contents of (__DATA,__objc_imageinfo) section
       version 0
         flags 0x6 OBJC_IMAGE_SUPPORTS_GC

That's for Xcode 4.4. So yes, it's still being built for Garbage Collection.

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