WIP: Move configure to m4

@matthieu: After a discussion with @pdraper, the simplest approach is to define m4 macros and just copy/paste them in PySWIFTsim.

In this merge request, I am just splitting configure.ac in multiple files. I will deal with PySWIFTsim in a later merger request.

By the way, we cannot expand AC_PROG_FC multiple time in a macro (required for velociraptor and grackle). The simplest approach was to have this requirement in every cases and not only with velociraptor/grackle. From my experience, fortran is still available on every linux computer.

added 18 commits

• ba1b401a...8e70ca0d - 16 commits from branch master
• 4e560f93 - Split configure in multiple subfiles
• 90038dec - Add gravity

Compare with previous version

I am not sure what went wrong with jenkins https://gitlab.cosma.dur.ac.uk/jenkins/job/SWIFT%20merge%20requests/1469/console

It seems that we should have mt_mpi in this case.

Could you explain what the wider goal of this is? To re-use the same macros in a different repo?

Exactly, in this way I can just re-use the macro in PySWIFTsim's configure.ac.

In SWIFT, I will try to add PySWIFTsim as a submodule and include its configure.ac in SWIFT's one (it should be easy, I have done some quick test). Therefore when you configure/compile SWIFT, you will be able to configure/compile PySWIFTsim at the same time.

I think it is also nice to split a bit configure.ac, this file was starting to become too huge.

Is there a use case for the python module to know about the exact configuration of the code?

The python module does not need it, but you do not inherit the configure.ac, you only inherit the parameters given to it (at least from what I understood).

marked as a Work In Progress

changed the description

This seems like more of a change than I expected. Nice and tidy, but I suspect we have lost some necessary orderings to do with when MPI compilers and the warning flags are defined, for instance, so some or maybe all of the special flags macro may need to be migrated back or further divided. Made WIP until I get some time to look at this closely.

closed