Gcc/10.2.0/gcc/Traditional-GNU-Objective 002dC-runtime-API
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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.