[CMake] fortran linking issue

[Juan E. Sanchez]

When I set the linker language of a fortran program to "C", it 
automatically links in -lgfortran, -lquadmath, -lm.

SET_TARGET_PROPERTIES(main_f PROPERTIES LINKER_LANGUAGE "C")

Unfortunately, that precludes me linking in static versions of  -lquadmath.

How do I tell CMAKE not to append these libraries when I change the 
LINKER_LANGUAGE to "C"?

Regards,

Juan