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似乎有两种方法可以在 Xcode 4.5 中关闭 Thumb 支持：
在中指定-mno-thumb标志Build Settings/Other C Flags
-mno-thumb
Build Settings/Other C Flags
设置GCC_THUMB_SUPPORT为NO_Build Settings/User-Defined
GCC_THUMB_SUPPORT
NO
Build Settings/User-Defined
这两种方法有区别吗？