Micropython fails to build with the latest GCC 13 release

[stratakis]

Micropython on Fedora started failing with our latest updates to GCC 13.

Error:

../py/stackctrl.c: In function 'mp_stack_ctrl_init':
../py/stackctrl.c:32:32: error: storing the address of local variable 'stack_dummy' in 'mp_state_ctx.thread.stack_top' [-Werror=dangling-pointer=]
   32 |     MP_STATE_THREAD(stack_top) = (char *)&stack_dummy;
../py/stackctrl.c:31:18: note: 'stack_dummy' declared here
   31 |     volatile int stack_dummy;
      |                  ^~~~~~~~~~~
In file included from ../py/runtime.h:29,
                 from ../py/stackctrl.c:27:
../py/mpstate.h:296:23: note: 'mp_state_ctx' declared here
  296 | extern mp_state_ctx_t mp_state_ctx;
      |                       ^~~~~~~~~~~~
cc1: all warnings being treated as errors
make: *** [../py/mkrules.mk:83: build/py/stackctrl.o] Error 1

Full build log attached.

build.log

[dlech]

Should be fixed by #11402

[stratakis]

Thanks for pointing it out. Trying out the fix.

[stratakis]

Indeed the issue is fixed by #11402 . Sorry for the noise. Closing this.

[dpgeorge]

If you need to build v1.20.0 without the error, try adding CFLAGS_EXTRA="-Wno-dangling-pointer" to the make invocation.