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From: Florian Weimer <fw@deneb.enyo.de>
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Subject: Re: max_align_t mess on i386
Date: Mon, 16 Dec 2019 18:49:21 +0100
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To: Rich Felker <dalias@libc.org>
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* 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);