Compilation fails with MPI options on: cc: error: unknown argument: '-fallow-argument-mismatch'

[yurivict]

In src/CMakeLists.txt you set the fortran-specific options generally but cc doesn't understand them:

        if (WANNIER90_MPIH AND CMAKE_Fortran_COMPILER_ID STREQUAL "GNU")
                target_compile_options(Wannier90_lib PRIVATE -fallow-argument-mismatch)
                target_compile_options(Wannier90_exe PRIVATE -fallow-argument-mismatch)
        endif ()

Fortran errors follow:

/usr/ports/science/wannier90/work/wannier90-4.0.1/src/comms.F90:1376:22:

 1376 |     call mpi_scatterv(rootglobalarray, counts, displs, MPI_DOUBLE_COMPLEX, array, localcount, &
      |                      1
......
 1468 |     call mpi_scatterv(rootglobalarray, counts, displs, MPI_INTEGER, array, localcount, &
      |                      2
Warning: Type mismatch between actual argument at (1) and actual argument at (2) (COMPLEX(8)/INTEGER(4)).
/usr/ports/science/wannier90/work/wannier90-4.0.1/src/comms.F90:1376:75:

 1376 |     call mpi_scatterv(rootglobalarray, counts, displs, MPI_DOUBLE_COMPLEX, array, localcount, &
      |                                                                           1
......
 1468 |     call mpi_scatterv(rootglobalarray, counts, displs, MPI_INTEGER, array, localcount, &
      |                                                                    2       
Warning: Type mismatch between actual argument at (1) and actual argument at (2) (COMPLEX(8)/INTEGER(4)).

This means that these options are set for the C code and not for the Fortran code.

clang-21
FreeBSD 15.1

[JeromeCCP9]

Hello!

It seems that actually the fortran options are being passed to your c compiler (according to the title of the post) and that this is causing the problem. Can you paste the context around the failure, please?