gfortan 9 produces warnings in sibyll

With gfortan 9, I get warnings like

/corsika/corsika/Processes/Sibyll/sibyll2.3c.f:6655:72:

 6655 | 250     RORD(IL2+1)=RORD(IL2)
      |                                                                        1
Warning: Fortran 2018 deleted feature: DO termination statement which is not END DO or CONTINUE with label 250 at (1)

I tried selecting the fortran language standard using the -std flag to fortran. I tried the allowed values ‘f95’, ‘f2003’, ‘f2008’, ‘f2018’, ‘gnu’, or ‘legacy’. Only the last value, 'legacy', will let me compile w/o error and w/o warnings. Using 'gnu' works with warnings. Selecting a strict compliant standard (‘f95’, ‘f2003’, ‘f2008’, or ‘f2018’) leads to an error that the code uses gnu extensions. @riehn: we should report this to the Sibyll developers.

Using 'legacy' seems to be the right choice for use with CORSIKA.

assigned to @riehn and unassigned @lukas

I believe that is fixed, but I would like @riehn to have a look and close the issue.

If I remember correctly the standard for sibyll and corsika 7 is set by some old fortran compiler on the KASCADE machines at KIT. pg77 or something like that.
In other words, the warnings and errors are expected. For %First full release: CORSIKA 8.0.0 it may be worth cleaning this up.

CORSIKA 7 and the interaction models are compiled with -std=legacy in general.

Using -std=legacy is not a problem for the bulk of platforms, since they use (most likely) gfortran. But it might affect us if we want to build with other compilers. Still, in the end, this is an issue for the developers of the interaction models.

This is fixed for CORSIKA 8 in 70f7c7ee, closing this issue.

closed