On Tue, 2025-05-27 at 09:33 +0100, Jonathan Wakely wrote: > > > On Tue, 27 May 2025, 07:04 Basile Starynkevitch, <basile@xxxxxxxxxxxxxxxxx> > wrote: > > On Sat, 2025-03-15 at 15:18 +0000, Johannes Krottmayer via Gcc-help wrote: > > > Dear GCC community! > > > > > > I have started a custom libc implementation for the purpose of > > > education. > > > > > > What are the minimum requirements for the library (functions, > > > headers, ...) which one *must* be implemented so GCC can use this > > > library as default? > > > > GCC is used to compile code without any libc. T > > Actually I don't understand your question. > > It's a perfectly reasonable question (but I don't know the answer). > > GCC assumes certain functions are always present, e.g. memcpy is needed for > copying large structs on the stack. The question is which functions does it > need. Your answer isn't really relevant to the question. memcpy is actually a builtin inside GCC. and has to be one because many processors (including x86-64 and ARM) has specific machine instructions to implement it efficiently. -- Basile STARYNKEVITCH <basile@xxxxxxxxxxxxxxxxx> 8 rue de la Faïencerie http://starynkevitch.net/Basile/ 92340 Bourg-la-Reine https://github.com/bstarynk France https://github.com/RefPerSys/RefPerSys
