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Re: C++ ABI Issues

From: Geoff Keating <geoffk at geoffk dot org>
To: Zack Weinberg <zack at codesourcery dot com>
Cc: Mark Mitchell <mark at codesourcery dot com>, gcc at gcc dot gnu dot org
Date: 26 Aug 2002 21:58:14 -0700
Subject: Re: C++ ABI Issues
References: <27170000.1030400196@warlock.codesourcery.com><20020826234312.GC31786@codesourcery.com>

Zack Weinberg <zack@codesourcery.com> writes:

> On Mon, Aug 26, 2002 at 03:16:36PM -0700, Mark Mitchell wrote:
> > Our testing and investigation has lead to the discovery of several places
> > where G++'s class layout still does not match the published ABI
> > specification.  Other vendors (notably HP and Intel) do match the ABI
> > specification.  Therefore, the ABI specification is probably not going
> > to change to validate G++'s behavior.
> > 
> > Therefore, we will have to choose whether or not we want to change G++
> > to match the specification.
> 
> Independent of what we decide to do about this specific issue, I
> propose that the release of 3.3 be delayed as long as necessary for
> testing tools to mature to the point that we have confidence we will
> not find further bugs in our implementation of the C++ ABI.

I think users would prefer a release that might have bugs to no
release at all.  I expect we'll be finding ABI-related bugs for years
to come; we were finding ABI-changing bugs in the _old_ ABI right up
until we switched to the new one.

-- 
- Geoffrey Keating <geoffk@geoffk.org> <geoffk@redhat.com>

References:
- C++ ABI Issues
  - From: Mark Mitchell
- Re: C++ ABI Issues
  - From: Zack Weinberg

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