[Bug fortran/78534] New: Use a larger integer type for character lengths on 64-bit targets

[jb at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78534

            Bug ID: 78534
           Summary: Use a larger integer type for character lengths on
                    64-bit targets
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jb at gcc dot gnu.org
  Target Milestone: ---

Currently GFortran uses a plain C int for character lengths. This prevents
longer characters on 64-bit targets. We should change to use size_t instead,
similar to the C string functions (str*(), mem*()), malloc(), etc. Also Intel
Fortran does this nowadays.

Now that the libgfortran ABI version has been bumped, it is the right time to
do this.

See also https://gcc.gnu.org/wiki/LibgfortranAbiCleanup