gcc: Traditional GNU Objective-C runtime API

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1 8.1.2 Traditional GNU Objective-C Runtime API
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1 The GNU Objective-C runtime used to provide a different API, which we
1 call the "traditional" GNU Objective-C runtime API. Functions belonging
1 to this API are easy to recognize because they use a different naming
1 convention, such as 'class_get_super_class()' (traditional API) instead
1 of 'class_getSuperclass()' (modern API). Software using this API
1 includes the file 'objc/objc-api.h' where it is declared.
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1  Starting with GCC 4.7.0, the traditional GNU runtime API is no longer
1 available.
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