[CMake] Problem with GNU compilers - difference between "Windows" and "MinGW"

[Arjen Markus]

Hello,

Alan Irwin and me ran into a rather peculiar problem concerning the
use of the GNU compiler suite on Windows. Here is the set-up:
- Alan's free_eos project uses the LAPACK and BLAS libraries.
- I tested his build system under Windows and to do that I first
   built BLAS and LAPACK from sources.
- To my surprise the free_eos project's build system failed to
   find the libblas.a and liblapack.a files that I had generated.
- I used the "MinGW Makefiles" generator in both cases.

Here is what I conclude from an analysis of what is going on:
- With the "MinGW Makefiles" generator, the GNU compilers are
   recognised first - which is what I wanted.
- I use the GNU compilers in an environment that does not state
   it is "MinGW" and so, find_library uses the Windows convention
   for naming libraries. So with in free_eos, CMake expects the
   files blas.lib and lapack.lib.
- The CMake configuration for the GNU compilers - ignoring the specifics
   of Windows - always uses the Linux convention for library names.
   So it produces libblas.a and liblapack.a.

I may be mistaken in the details, but this is definitely what it boils
down to. Shouldn't the "MinGW Makefiles" generator take care of these
two naming conventions?

Regards,

Arjen

 

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