Libstdc++-v3 vs darwin vs weak support

[Geoffrey Keating]

Paolo Carlini <pcarlini@suse.de> writes:

> Hi,
> 
> in March 2004 we added to many libstdc++-v3 testcases lines similar to
> 
> #if !__GXX_WEAK__ && _MT_ALLOCATOR_H
> // Explicitly instantiate for systems with no COMDAT or weak support.
> template class __gnu_cxx::__mt_alloc<std::_List_node<int> >;
> #endif
> 
> AFAIK, only in order to avoid spurious failures on darwin.
> 
> I'd like to know from the maintainers (or other knowledgeable people)
> which is the current situation, whether those explicit instantiations
> are still needed. I'm asking because I mean to move from v7 to
> mainline a bunch of similar testcases...

Darwin now has weak/comdat support, so it doesn't need or use this any more.

However, AIX does need them, I think.