https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50537
--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- Since gcc version 4.9.2 and up to trunk (6.0) I now get pr50537_db.f90:5:24: character(len=2) f 1 Error: Explicit interface required for 'f' at (1): result with non-constant character length Does it mean that this PR is now fixed?