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Date: Thu, 14 Aug 2014 17:00:08 +0200
To: Rich Felker <>
Subject: Re: compiling musl on x86_64 linux with pcc

On Thu, Aug 14, 2014 at 10:47:02AM -0400, Rich Felker wrote:
> > > > __builtin_va_list non-mandatory?
> > > 
> > > How else would you do it? There's no real alternative.
> > 
> > Well, tcc works e.g. with uclibc, which means this is possible,
> > even though I did not look at "how".
> Apparently tcc has its own stdarg.h which uses the nonsense legacy
> definition for i386 where the arguments are assumed to lie at fixed
> locations on the stack; this assumption is invalid because the
> compiler need not reuse the passed-in storage as the local object, and
> in the case of inlining there won't even be any passed-in storage. But
> it probably works for tcc since tcc sucks.


> See the __GNUC__>=3
> condition in musl's stdarg.h. Disabling that (perhaps adding
> &&!__TCC__ or similar) should make tcc work with musl on i386, but

This is a good news (modulo the limitations) and at least some benefit
from the legacy stuff - tcc is invaluable for rapid prototyping.

> x86_64 is harder since there is no legacy definition and tcc did its
> own craziness that relies on external functions named __va_*.

This is a bad news.

Thanks for the explanation Rich,


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