[arch-dev-public] fortran modules and gfortran version

[Stéphane Gaudreault]

I am sending here because this could require intervention for some 
packages and also to discuss a solution to prevent the problem in the 
future.

Sometimes with newer versions of GCC there is a change in the version 
for Fortran modules which is incompatible with older versions. All 
packages providings Fortran modules (usually .mod files) must be rebuilt 
when the module version is bumped. A possible solution to identify those 
packages could be to provide a Fortran module ABI number in our gfortran 
PKGBUILD and force packages with .mod files to explicitly depend on it.

Any thoughts on this?

Cheers,

Stéphane

---

Example with gfortran 4.8.0 and the openmpi package build with a 
previous version :

# cat test_mpi_fmodule.f90
program test
USE mpi
end program test

# mpif90 test_mpi_fmodule.f90
test_mpi_fmodule.f90:2.4:

USE mpi
     1
Fatal Error: Cannot read module file 'mpi.mod' opened at (1), because it 
was created by a different version of GNU Fortran