Messages in this thread | | | Date | Tue, 29 Aug 2023 08:28:27 +0200 | From | Willy Tarreau <> | Subject | Re: [PATCH 1/2] tools/nolibc: add stdarg.h header |
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Hi Thomas,
On Sun, Aug 27, 2023 at 10:00:15AM +0200, Thomas Weißschuh wrote: > This allows nolic to work with `-nostdinc` avoiding any reliance on > system headers. > > The implementation has been lifted from musl libc 1.2.4. > There is already an implementation of stdarg.h in include/linux/stdarg.h > but that is GPL licensed and therefore not suitable for nolibc.
I'm a bit confused because for me, stdarg was normally provided by the compiler, but I could be mistaken. It's just that it reminds me not so old memories. Therefore maybe we just need to include or define "something" to use it.
> +#ifndef _NOLIBC_STDARG_H > +#define _NOLIBC_STDARG_H > + > +typedef __builtin_va_list va_list; > +#define va_start(v, l) __builtin_va_start(v, l) > +#define va_end(v) __builtin_va_end(v) > +#define va_arg(v, l) __builtin_va_arg(v, l) > +#define va_copy(d, s) __builtin_va_copy(d, s) > + > +#endif /* _NOLIBC_STDARG_H */
Also, regarding the doubt above, I really think these should be guarded (maybe just use va_start as a hint), because the risk that they come from libc headers or maybe from the compiler via another include path is non-negligible.
Just my two cents, Willy
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