../../../../ext/nokogiri/xml_document.c: In function ‘dealloc’:
../../../../ext/nokogiri/xml_document.c:58:25: warning: passing argument 2 of ‘rb_st_foreach’ from incompatible pointer type [-Wincompatible-pointer-types]
   58 |   st_foreach(node_hash, dealloc_node_i, (st_data_t)doc);
      |                         ^~~~~~~~~~~~~~
      |                         |
      |                         int (*)(xmlNode *, xmlNode *, xmlDoc *) {aka int (*)(struct _xmlNode *, struct _xmlNode *, struct _xmlDoc *)}

../../../../ext/nokogiri/xml_io.c: In function ‘io_read_callback’:
../../../../ext/nokogiri/xml_io.c:20:22: warning: passing argument 1 of ‘rb_rescue’ from incompatible pointer type [-Wincompatible-pointer-types]
   20 |   string = rb_rescue(read_check, (VALUE)args, read_failed, 0);
      |                      ^~~~~~~~~~
      |                      |
      |                      VALUE (*)(VALUE *) {aka long unsigned int (*)(long unsigned int *)}

and

../../../../ext/nokogiri/xml_io.c:20:47: warning: passing argument 3 of ‘rb_rescue’ from incompatible pointer type [-Wincompatible-pointer-types]
   20 |   string = rb_rescue(read_check, (VALUE)args, read_failed, 0);
      |                                               ^~~~~~~~~~~
      |                                               |
      |                                               VALUE (*)(void) {aka long unsigned int (*)(void)}