[Bug fortran/117798] Audit intrinsic subprograms with scalar INTENT(OUT) character strings

[kargls at comcast dot net via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117798

--- Comment #2 from kargls at comcast dot net ---
I think that Fortran 2023 may break the ABI for gfortran.

F2008 has "13.7.65 GET COMMAND ([COMMAND, LENGTH, STATUS])"

Currently, libgfortran/intrinsics/args.c has 

void
get_command_i4 (char *command, GFC_INTEGER_4 *length, GFC_INTEGER_4 *status,
                gfc_charlen_type command_len)

F2018 and F2023 have

16.9.82 GET_COMMAND ([COMMAND, LENGTH, STATUS, ERRMSG])

So, we need to add an ERRMSG variable, which changes the interface to 

void
get_command_i4 (char *command, GFC_INTEGER_4 *length, GFC_INTEGER_4 *status,
                char *errmsg, gfc_charlen_type command_len, gfc_charlen_type
                errmsg_len)


Currently, for the code in comment #1, gdb shows the call

Breakpoint 1, _gfortrani_get_command_i4 (command=0x0, length=0x0, status=0x0, 
    command_len=1) at ../../../gccx/libgfortran/intrinsics/args.c:197

and the code contains

  if (command == NULL && length == NULL && status == NULL)
    return; /* No need to do anything.  */

whoops.