[Dune] [#965] dune-grid fails headercheck

[Dune]

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FS#965 - dune-grid fails headercheck
User who did this - Jö Fahlke (joe)

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>From the point of view of the autotools it is a header, and it should have one of the usual c++ header extensions so there is no chance they get confused.

Now we can discuss whether it is conceptually a header, but I consider that discussion a waste of time.

If you really don't like *.hh how about something like *_imp.hh, e.g volume_main_imp.hh?

Regardless of that, I'd simply put that file into HEADERCHECK_IGNORE.  Another correct solution would be to wrap the main function into #ifndef HEADERCHECK/#endif, that way at least the #include lines get checked.

With other programs using the same pattern, you could also detect HEADERCHECK mode, provide a dummy typedef Grid to e.g. SGrid etc., and use a different name for main.  But this particular program really only works with ALUGrids (since it relies on an alugrid-specific constructor), so testing of (a renamed) main() can only can only work when ALUGrid is present.  It's probably not worth the hassle.

@Christoph: BTW, I consider this particular subtask owned by you, if you loose interest, please say so, then I'll deal with it.
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