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Re: Dealing with C++98/11 ABI incompatibilities
On Wed, 4 Jul 2012, Richard Guenther wrote:
> > [... mangling change ...]
> That would not address the issue of interoperability of a C++03 library
> with a C++11 program or vice versa if they are using any of the changed
> interfaces for interoperability. Passing pointers to such objects still
> would work and break unnoticed.
But it's the best we can possibly do _if_ we want to conform to c++11 in
the v6 ABI. IMHO we want to, so we have to at least make 98/11 code
coexist in the same process image, which means mangling changes. That the
code can't interoperate is understood.
It will by the way not break unnoticed: interfaces using the problematic
types would be mangled differently, and hence c++98 code would silently be
resolved to a c++11 variant expecting a different layout.