With GCC 14 series, the following error exists:

fp_drv.c: In function 'control':
fp_drv.c:126:48: error: passing argument 2 of 'erl_drv_thread_join' from
incompatible pointer type [-Wincompatible-pointer-types]
  126 |         else if (0 != erl_drv_thread_join(tid, &res_str))
      |                                                ^~~~~~~~
      |                                                |
      |                                                char **
In file included from fp_drv.c:43:
/build/tmp/work/core2-64-poky-linux/erlang/27.0/git/erts/emulator/beam/erl_driver.h:487:50:
note: expected 'void **' but argument is of type 'char **'
  487 | EXTERN int erl_drv_thread_join(ErlDrvTid, void **respp);
      |                                           ~~~~~~~^~~~~

With GCC 14 series, the following error exists:

dead_port.c:43:26: error: return type defaults to 'int' [-Wimplicit-int]
   43 | #define MAIN(argc, argv) main(argc, argv)
      |                          ^~~~
dead_port.c:50:1: note: in expansion of macro 'MAIN'
   50 | MAIN(argc, argv)
      | ^~~~

With GCC 14 series the following error exists:

unlink_signal_drv.c: In function 'start':
unlink_signal_drv.c:77:17: error: assignment to 'ErlDrvData' {aka
'struct _erl_drv_data *'} from incompatible pointer type 'ErlDrvPort'
{aka 'struct _erl_drv_port *'} [-Wincompatible-pointer-types]
   77 |     state->port = port;
      |                 ^
unlink_signal_drv.c: In function 'output':
unlink_signal_drv.c:86:27: error: passing argument 1 of
'driver_set_timer' from incompatible pointer type
[-Wincompatible-pointer-types]
   86 |     driver_set_timer(state->port, 2);
      |                      ~~~~~^~~~~~
      |                           |
      |                           ErlDrvData {aka struct _erl_drv_data
*}