[Dune] [#311] HAVE_ALU is not suffient

[Dune]

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FS#311 - HAVE_ALU is not suffient
User who did this - Christian Engwer (christi)

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The problem arises from static member variables in some non-template classes. The problem is the same we were facing with the MPI libs/headers. HAVE_MPI only says that MPI was found, but we don't know, whether MPI is actually used. Therefor USE_MPI was introduced, which is set in the MPI_HEADER variable. Now grid etc. can decide whether it is safe to use MPI or not. The same is necessary for ALU. If I write a module which might use ALU, it must include the header, but it does not know whether it is safe to use ALU.
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