trip over unknown configure options

[boegel]

We need to make sure we trip when unknown configure options are being used.

The autoconf configure script will only issue a warning, but will happily continue, e.g. when using --enable-mpi-threads with OpenMPI v1.6.4:

configure: WARNING: unrecognized options: --enable-mpi-threads

This particular one was only figured out when OpenMPI was being used to build and test larger programs depending on its functionality, i.e. CP2K, so way too late in the build cycle.

[pforai]

What about creating configure from configure.ac, run the autoconf program with --warnings=error to make the resulting configure script fail on warnings and threat them as errors?

[boegel]

That's a very good suggestion, but my experiences with recreating configure from configure.ac are not good. I've seen all kinds of problems pop up, and I'm not sure configure.ac is always provided (although it should be).

I'll give this a try first when I get to this, thanks!

[fgeorgatos]

correction: Autoconf is the relevant one here and exists as easyconfig