new concept checks and the 3.0 ABI

[Gabriel Dos Reis]

Joe Buck <jbuck@racerx.synopsys.com> writes:

| Jason Merrill <jason_merrill@redhat.com> writes:
| > | What I think Joe is asking about is the libstdc++ ABI; in other words,
| > | should people be able to expect that STL-using code compiled with 3.0 will
| > | link with code compiled with 3.1?  In other words, should we commit
| > | ourselves to making only representation-compatible changes?  Mark has
| > | expressed the opinion that we should.  I'm ambivalent.
| 
| Exactly.
| 
| Gaby writes:
| > That is a very strong requirement I would like us not committed to.
| 
| Without such a requirement, claiming that the C++ ABI is stable is a joke,
| and we should just drop the claim.

What we need to tell users is what exactly is meant by "C++ ABI won't
change".  As discussed, it is the fact that what is described in

	http://www.codesourcery.com/cxx-abi/

will be implemented in GCC/g++ and that interface won't change.

I don't recall any discussion to the effect that libstdc++ ABI was
meant.  There are so many things not in their final shape that I can't
even imagine that the whole libstdc++ was implied.

-- Gaby