The test overrides the CMAKE_C_FLAGS and CMAKE_Fortran_FLAGS to test
passing a specific flag to the compiler wrapper scripts. We fix it to
honor any outside flags needed for the real compiler.
CMake does not enable Fortran for its own build, but it needs to find a
Fortran compiler to know if it is possible to enable Fortran tests.
Previously we searched for a hard-coded list of Fortran compilers which
was duplicated from the CMakeDetermineFortranCompiler.cmake module. We
now run CMake on a small test project that enables the Fortran language
and reports the compiler it found. This represents a more realistic
check of whether the Fortran tests will be able to find a compiler.
Todd Gamblin
Brad King