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of why crt0 was replaced by crt1, crtbegin, crtend: The original crt0 only knew how to run main(), but the newer trio knows how to first run the program's constructors (C++ programs, for example, allow constructors of static objects to run before main()), then run main(), and then run the program's
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specific to gcc, as the numerous gcc references in the current text seem to imply. Also, while in old Unixes I actually remember a /lib/crt0.o, on my current Linux system, such a file doesn't exist - there are similar files like crt1, crtn, crtbegin, crtend, and other stuff. It should be perhaps
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The introduction paragraph lacks any context of what this "crt0" is related to. Is it a general computing concept, specific to Unix, to Linux, or to Gcc? As far as I know, it is a very old Unix concept (I seem to remember it already when using Unix in the end of the 80s), and is
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explained that "crt0" existed as such on older systems (if that is indeed the case) but later systems replaced it by (what).
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of crt0, and explain how the existing program startup mechanism has evolved since this original concept.
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