GCC 8 thinks that the case drive_protocol_gluster may fall through, most probably because the only code is a switch case that handles the elements of an enum, and thus letting other fall through. In reality this ought to not happen at all, so help GCC by break'ing the case, which will then lead to the abort() at the end of guestfs_int_drive_source_qemu_param. --- lib/qemu.c | 1 + 1 file changed, 1 insertion(+) diff --git a/lib/qemu.c b/lib/qemu.c index cd859139d..a50eca988 100644 --- a/lib/qemu.c +++ b/lib/qemu.c @@ -746,6 +746,7 @@ guestfs_int_drive_source_qemu_param (guestfs_h *g, return make_uri (g, "gluster+unix", NULL, NULL, &src->servers[0], NULL); } + break; case drive_protocol_http: return make_uri (g, "http", src->username, src->secret,