[Bug fortran/113096] New: [F2023] Allow deferred-length character argument to ERRMSG= specifier

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113096

            Bug ID: 113096
           Summary: [F2023] Allow deferred-length character argument to
                    ERRMSG= specifier
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: anlauf at gcc dot gnu.org
  Target Milestone: ---

Fortran 2023 specifies the following enhancement over Fortran 2018:

"A deferred-length allocatable errmsg-variable is allocated by the processor
to the length of the explanatory message."

This needs to be handled by statements translated by the compiler (e.g.
ALLOCATE/DEALLOCATE), image control statements, and intrinsic subroutines
MOVE_ALLOC, GET_COMMAND, GET_COMMAND_ARGUMENT, and GET_ENVIRONMENT_VARIABLE
implemented in libgfortran.