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Re: C ABI: struct/union inconsistency

From: Mark Mitchell <mark at codesourcery dot com>
To: Richard Henderson <rth at redhat dot com>
Cc: Gabriel Dos Reis <gdr at integrable-solutions dot net>, "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>
Date: Fri, 27 Sep 2002 16:23:54 -0700
Subject: Re: C ABI: struct/union inconsistency

--On Friday, September 27, 2002 04:08:48 PM -0700 Richard Henderson <rth@redhat.com> wrote:

On Fri, Sep 27, 2002 at 02:06:49PM -0700, Mark Mitchell wrote:

Why not ask the kernel developers about something like:

 struct S __attribute__((possibly_empty)) {};

?

The idea being that if S has no members, the size ends up zero.

As it happens, something like this was independently suggested
by Alan Cox, so it seems that this is a reasonable solution.

Good.  I agree with the other suggestions you make, such as making
zero-sized arrays keep the whole thing having size zero.  Basically,
an attribute that preserves the current behavior.

So, the biggest remaining question is what name to use for the
attribute.  I don't think "possibly_empty" is very good.

How about "tiny"?

--
Mark Mitchell                mark@codesourcery.com
CodeSourcery, LLC            http://www.codesourcery.com

Follow-Ups:
- Re: C ABI: struct/union inconsistency
  - From: David S. Miller

References:
- Re: C ABI: struct/union inconsistency
  - From: Richard Henderson

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