8.1.2 Traditional GNU Objective-C runtime API

The GNU Objective-C runtime used to provide a different API, which we call the “traditional” GNU Objective-C runtime API. Functions belonging to this API are easy to recognize because they use a different naming convention, such as class_get_super_class() (traditional API) instead of class_getSuperclass() (modern API). Software using this API includes the file ‘objc/objc-api.h’ where it is declared.

Starting with GCC 4.7.0, the traditional GNU runtime API is no longer available.

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