g++ -shared and libstdc++.a specs bug?

[Robert Collins]

Using g++ -shared to build a C++ dll, it failed to link with a number of
missing symbols. Adding -lstdc++ to the link line fixed this. The
interesting point is that the static build worked fine.

I presume the correct solution is either a dllised libstdc++, or a specs
file tweak.

I'm not a g++ specs afficiondo, so this is just a heads up. If I get
time I may look into this more, but no promises.

Rob

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