manywarnings for C++

[Reuben Thomas]

I needed this recently, so I made it. I have not attempted to refactor the code, as there seem to be multiple sensible-seeming ways to do this; I attach a simple duplication of the manywarnings files, reconfigured for C++.

I'd be happy to work this up into a patch given some guidance on what shape it should take.

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http://rrt.sc3d.org

manywarnings-cxx
Description: Binary data

manywarnings-cxx.m4
Description: application/m4

g++-warning.spec
Description: Text Data