[Bug target/118329] avr defines __int24 but doesn't define __GLIBCXX_TYPE_INT_N_0

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118329

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I wouldn't create a new type.  Instead:
  for (int i = 0; i < NUM_INT_N_ENTS; i++)
    if (int_n_data[i].bitsize == 24)
      {
        lang_hooks.types.register_builtin_type (int_n_trees[i].unsigned_type,
                                                "__uint24");
        break;
      }
or so.  But, I haven't really tried it, tested, ...
Note, I'm not the author of the INT_N stuff, just reading what I see...