Apparently, even though the manpage says it returns an int, it can return a long instead and cause a warning. Bug not in any released Tor. Part of #28399
@@ -1228,7 +1228,7 @@ tor_tls_context_new(crypto_pk_t *identity, unsigned int key_lifetime,
list = "P-256:P-224";
else
- int r = SSL_CTX_set1_groups_list(result->ctx, list);
+ int r = (int) SSL_CTX_set1_groups_list(result->ctx, list);
if (r < 0)
goto error;
}