[Bug fortran/125383] [14/15/16/17 Regression] Optional dummy procedure called from contained subprogram results in linking error

[anlauf at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125383

--- Comment #2 from Harald Anlauf <anlauf at gcc dot gnu.org> ---
Observation: replacing

      if (present(parg)) call parg

by an unprotected call

      call parg

seems to "resolve" the problem.