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Re: C++ ABI Issues
- From: Loren James Rittle <rittle at latour dot rsch dot comm dot mot dot com>
- To: gcc at gcc dot gnu dot org
- Cc: mark at codesourcery dot com
- Date: Mon, 26 Aug 2002 18:46:21 -0500 (CDT)
- Subject: Re: C++ ABI Issues
- Organization: Networks and Infrastructure Lab (IL02/2240), Motorola Labs
Hi Mark,
> 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. [...]
> I propose that we fix G++ to match the ABI, but that we issue warnings
> about classes whose layout has changed from GCC 3.2.
This sounds quite reasonable to me. However, this will be quite
annoying in practice, if e.g. libstdc++-v3 exposes something that
triggers issue 2 (I'm fairly sure that it will not trigger issue 1).
> If we are going to fix G++, we also have to decide how urgently to do
> another release.
Seems that low-level C++ ABI issues should be fixed sooner rather than
later now that we claim to adhere to a multi-vendor standard.
Regards,
Loren