In Go you cannot fully control the runtime as a programmer- Go's GC is a complicated periodically run program with sometimes surprising behavior. crt0.o is a v

In Go you cannot fully control the runtime as a programmer- Go's GC is a complicated periodically run program with sometimes surprising behavior. crt0.o is a very simple set of startup routines with a fixed and predictable behavior. It is typically run only once ("0" in the name is for startup), and has only a couple of assembly instructions.