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From: Rich Felker <dalias@libc.org>
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Subject: Re: max_align_t mess on i386
Date: Mon, 16 Dec 2019 12:51:24 -0500
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On Mon, Dec 16, 2019 at 06:49:21PM +0100, Florian Weimer wrote:
> * Rich Felker:
> 
> > The latter looks buggy. It's clearly supposed to be in bits, not
> > bytes, with some archs defining it as 64 or 128 and:
> >
> > gcc/defaults.h:#ifndef MALLOC_ABI_ALIGNMENT
> > gcc/defaults.h:#define MALLOC_ABI_ALIGNMENT BITS_PER_WORD
> >
> > However arm has:
> >
> > gcc/config/arm/arm.h:#define MALLOC_ABI_ALIGNMENT  BIGGEST_ALIGNMENT
> >
> > which is in bytes...
> 
> The target hook is in bits.  The macro synthesized from that is in
> bytes:
> 
>   cpp_define_formatted (pfile, "__BIGGEST_ALIGNMENT__=%d",
>                         BIGGEST_ALIGNMENT / BITS_PER_UNIT);

Ah, that explains it. So no bug. Thanks.

Rich