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malloc()andfree()are not built in to the language, are not part of the operating system, but are functions in this library. C++ is also sometimes compiled with a garbage collection library, even though the language was not designed with GC in mind.dynamic_castand exceptions work, even if you don't add a GC.main(), and it's perfectly legal to, say, fire up a GC thread in this code. (Assuming the GC isn't done inside memory allocation calls.) At runtime, GC only really needs to know what parts of an object are pointers or object references, and the compiler needs to emit the code to translate an object reference to a pointer if the GC relocates objects.crt0.o(Which stands for "C RunTime, the very basics"), which gets linked with every program (or at least every program that isn't free-standing).