Comment by btrettel

One approach for testing with multiple compilers that I use on some Fortran projects (where testing against multiple compilers seems more common than in C) is to use a variable from the command line to specify the compiler, for example:

    make FC=ifx check

On my Fortran projects, that will run the tests with Intel's Fortran compiler. The Makefile has logic to automatically change compiler flags as appropriate. I default to the GNU Fortran compiler, so `FC` isn't required.

I have made a script to run through a series of compilers by alternating between `make check` and `make clean`.

I have separate Makefiles for GNU Make and NMAKE/jom. My Fortran code works fine on various Linux distributions and Windows, though I'll add that achieving that is probably easier with Fortran than C. I've also tried a BSD Make that worked (on Ubuntu at least). My Makefiles are pretty close to the intersection of POSIX and NMAKE, so the main differences between the different Make versions are the conditional statements needed to handle the different compiler flags and the include statements (as I put the compiler flags in separate files).