[CMake] mixed Fortran/C{++} executables

[Nico Schlömer]

Hi all,

another one on mixed Fortan/C{++} executables here.

Suppose you have one C{++} source file, a Fortran one, and a C{++}
main. They all need to be compiled and linked into an executable.
There are different situations where CMake doesn't do what I expected:

  (* All GCC, the linker is gfortran. All is fine.)
  * All GCC, the linker is g++. CMake doesn't seem to account to for
linking against libgfortran.a.
  * All Intel. When compiling with icc, the Fortran standard library
needs to be manually added just like with GCC.
  * All Intel. When compiling with ifort, the mandatory options
"-nofor-main -lstdc++ " need to be manually specified. Otherwise, one
has two MAIN_ routines.

For GCC, the "solution" now is to force Fortran a linker language.

Well, I suppose there's some switch I forgot to set, and maybe one of
you can help me out.

Of all those situations, I'm most interested in solutions to the last one.

Cheers,
Nico