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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Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-6.3.0/gcc/Traditional-GNU-Objective_002dC-runtime-API.html