-XBT_PUBLIC void xbt_cfg_register_double(const char* name, double default_val, xbt_cfg_cb_t cb_set, const char* desc);
-XBT_PUBLIC void xbt_cfg_register_int(const char* name, int default_val, xbt_cfg_cb_t cb_set, const char* desc);
-XBT_PUBLIC void xbt_cfg_register_string(const char* name, const char* default_val, xbt_cfg_cb_t cb_set,
- const char* desc);
-XBT_PUBLIC void xbt_cfg_register_boolean(const char* name, const char* default_val, xbt_cfg_cb_t cb_set,
- const char* desc);
+XBT_ATTRIB_DEPRECATED_v323("Please use simgrid::config::declareFlag<>") XBT_PUBLIC
+ void xbt_cfg_register_double(const char* name, double default_val, xbt_cfg_cb_t cb_set, const char* desc);
+XBT_ATTRIB_DEPRECATED_v323("Please use simgrid::config::declareFlag<>") XBT_PUBLIC
+ void xbt_cfg_register_int(const char* name, int default_val, xbt_cfg_cb_t cb_set, const char* desc);
+XBT_ATTRIB_DEPRECATED_v323("Please use simgrid::config::declareFlag<>") XBT_PUBLIC
+ void xbt_cfg_register_string(const char* name, const char* default_val, xbt_cfg_cb_t cb_set, const char* desc);
+XBT_ATTRIB_DEPRECATED_v323("Please use simgrid::config::declareFlag<>") XBT_PUBLIC
+ void xbt_cfg_register_boolean(const char* name, const char* default_val, xbt_cfg_cb_t cb_set, const char* desc);