[CMake] pass compile flags to initial compiler test

[Yngve Inntjore Levinsen]

I am trying to use a rather vanilla compiler for my CMake project (Lahey-Fujitsu lf95 fortran compiler). This compiler (or perhaps just the particular version I have available) does only compile 32bit binaries, so on 64bit systems the initial test fails. In order for the test to succeed I need to pass some flags to the cmake script to be used for this initial testing, but I have not succeeded in finding information about how to do this. Anybody knows?

Thanks in advance for your help!

Best Regards
Yngve I. Levinsen