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Date: Thu, 8 May 2014 10:11:58 -0400
From: Rich Felker <>
Cc: Pawel Dziepak <>
Subject: Re: [PATCH] add definition of max_align_t to stddef.h

On Thu, May 08, 2014 at 12:57:22PM +0200, Szabolcs Nagy wrote:
> > As I see it, we have a choice whether to use the "8" definition on
> > i386 or use the natural definition, which would yield "4" on i386.
> > This is not an ABI issue (it does not affect the ability to use
> > glibc-built object files/binaries/shared libraries with musl, nor the
> > C++ name mangling ABI) but an API issue.
> assuming max_align_t does not appear in a function prototype

As long as the union tag and size are the same, it should not matter.
I don't think alignments affect i386 argument passing convention at
all. Certainly the traditional va_arg macro does not account for them;
it just assumes every argument is aligned to 4 bytes.


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