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Date: Wed, 13 Aug 2014 16:43:26 +0200
Subject: Re: compiling musl on x86_64 linux with pcc

On Wed, Aug 13, 2014 at 10:23:32AM -0400, Rich Felker wrote:
> > Indeed, with a change of all "r11" to "%r11" in
> >  arch/x86_64/syscall_arch.h
> > the compilation went through without disabling the separate __syscallN().
> Just because it compiled doesn't mean it works. Those warnings about
> register assignment definitely should be hard errors because the code
> will do horribly wrong things if the requested constraints are not
> met.

I suspected this, did not try to run that code.

> I think tcc has a long ways to go... But pcc was working in the past
> (at least on 32-bit) and should work.

I'll report the progress when I come further.

> BTW about the mmap2 preprocessor issue, did you raise that with ppc
> developers too? I think it's a bug on their side but I'm not 100%
> sure. If the code in musl is not valid C I'll change it, but if it is,
> I think we should just wait for pcc to get fixed.

Anders wrote:

>>     __syscall(
>> #ifdef SYS_mmap2
>> becomes after -E
>>     __syscall(#ifdef SYS_mmap2 ....
>Having conditionals inside macro lists is undefined, see 6.10.3 clause 11.
>Here I recommend fixing the code instead.

I think this means the code should be changed.


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