High Quality Content by WIKIPEDIA articles! crt0 (or crt0.o, gcrt0.o, mcrt0.o) is a set of execution startup routines (usually part of the C standard library) that are platform-dependent, and is required in order to compile using GCC and other GNU tools. crt stands for "C runtime". The code that starts running first is the startup code. Traditionally it's called c0 (Unices) or crt0 (Windows). The code does some initialization work.

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