Compile error when enable LVGL LV_USE_MSG in lv_conf.h

[bl4kraven]

Hi,

version

newest master branch 649ce43c23634a8cdf9d1db6ba8aa9800e6e6793

error reproduce

enable LV_USE_MSG in lv_config.h

/1: Enable a published subscriber based messaging system /

define LV_USE_MSG 1

gcc error message

error file is lv_mpy.c

build-sdl/lvgl/lv_mpy.c:33530:17: error: ‘mp_lv_msg_subsribe_obj’ redeclared as different kind of symbol 33530 | STATIC mp_obj_t mp_lv_msg_subsribe_obj(size_t mp_n_args, const mp_obj_t mp_args, void lv_func_ptr) | ^~~~~~ build-sdl/lvgl/lv_mpy.c:33522:46: note: previous definition of ‘mp_lv_msg_subsribe_obj’ was here 33522 | STATIC MP_DEFINE_CONST_LV_FUN_OBJ_STATIC_VAR(mp_lv_msg_subsribe_obj, 3, mp_lv_msg_subsribe, lv_msg_subsribe);

lv_mpy.c error parts:

STATIC mp_obj_t mp_lv_msg_subsribe(size_t mp_n_args, const mp_obj_t *mp_args, void *lv_func_ptr)
{
    void *user_data = mp_to_ptr(mp_args[2]);
    lv_msg_subscribe_cb_t cb = mp_to_ptr(mp_args[1]);
    uint32_t msg_id = (uint32_t)mp_obj_get_int(mp_args[0]);
    void * _res = ((void *(*)(uint32_t, lv_msg_subscribe_cb_t, void *))lv_func_ptr)(msg_id, cb, user_data);
    return ptr_to_mp((void*)_res);
}

STATIC MP_DEFINE_CONST_LV_FUN_OBJ_STATIC_VAR(mp_lv_msg_subsribe_obj, 3, mp_lv_msg_subsribe, lv_msg_subsribe);

/*
 * lvgl extension definition for:
 * void *lv_msg_subsribe_obj(uint32_t msg_id, lv_obj_t *obj, void *user_data)
 */

STATIC mp_obj_t mp_lv_msg_subsribe_obj(size_t mp_n_args, const mp_obj_t *mp_args, void *lv_func_ptr)
{
    void *user_data = mp_to_ptr(mp_args[2]);
    lv_obj_t *obj = mp_to_lv(mp_args[1]);
    uint32_t msg_id = (uint32_t)mp_obj_get_int(mp_args[0]);
    void * _res = ((void *(*)(uint32_t, lv_obj_t *, void *))lv_func_ptr)(msg_id, obj, user_data);
    return ptr_to_mp((void*)_res);
}

so it's a variable redefined error, mp_lv_msg_subsribe_obj is redefined.

why

if enable LV_USE_MSG LVGL enable two native function : lv_msg_subscribe and lv_msg_subsribe_obj.

but gen_mpy.py create the micropython function obj lv_msg_subsribe_obj for lv_msg_subscribe , so confict to the native LVGL function lv_msg_subsribe_obj.

so maybe gen_mpy.py must check micropython function obj name not confict with LVGL native function.

[amirgon]

Thank you for reporting this!

Fixed, by renaming _obj to _mpobj.

[amirgon]

See also: https://github.com/lvgl/lvgl/pull/3488