[Dune] [#1000] Migrate build system from autotools to CMake

[Dune]

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FS#1000 - Migrate build system from autotools to CMake
User who did this - Sascha Zelzer (sascha)

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First, thanks for the efforts you are putting into the CMake scripts.

Although variable names would look a bit strange, I would vote for using -Ddune-common_DIR=... and find_package(dune-common).

As I understand it, for example the dune-istl module would provide a dune-istl-config.cmake file (which is read via find_package(dune-istl) if dune-istl_DIR is set) and it would also provide the <module-name>_DIR variables for dependent modules (I think it should actually do an explicit find_package(dune-common) etc., or is it doing that already? I didn't test the system yet...).

For the weird variable names like e.g. dune-common_LIBRARIES, they should probably be hidden in some custom CMake macros which would set-up all the required dependencies for a given module, so module writers would not need to reference them directly (although they could).

Just a couple of thoughts...
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