Move to CMake [directly]

[SAnsell]

Indroduction

The current build mechanism of CombLayer uses cmake via a perl script that builds a single top level directory CMakeLists.txt file. This is not the normal way to do cmake which typically uses a CMakeLists.txt in every directory. The new build aim to correct that.

Firstly : the advantages of avoiding the old system (for CombLayer) are that

• if you download a new version of CombLayer and a new file has been added then you do nothing, just type make and you are done.
• if you accidentally (or deliberately) put a file in a directory that is not part of CombLayer, then that doesn't matter.
• The include paths can be simplified
• Building out of the source directory is supported.

Status

I have implemented this (currently in branch CleanCMake) but will be rolling it out to the master branch (soon?). If you pull this branch (or the master branch after a merge) then you run a cmake . command first (because the cmake structure has changed.) then a make. Afterwards, cmake should not be needed unless something very drastic is changed.

To do this transition there are two additional files (that you can ignore), CMakeIndividual.pl which builds a CMakeLists.txt file for a given directory, and model.sh that builds the CMakeLists.txt file (using CMakeIndividual.pl) for almost all the directories except the top directory (which I did by hand).

Obviously, this is a bit of a learning curve so suggestions for improvements are welcome etc.. If you have reasons to not like this change and/or if you try it and it breaks etc.. please say something...

[SAnsell]

I have moved this to the main branch.