Use -O not -O3: reduces ccan/tdb test time from 24 to 18 seconds.
[ccan] / ccan / typesafe_cb / test /
drwxr-xr-x   ..
-rw-r--r-- 496 compile_fail-cast_if_type.c
-rw-r--r-- 584 compile_fail-typesafe_cb-int.c
-rw-r--r-- 676 compile_fail-typesafe_cb.c
-rw-r--r-- 581 compile_fail-typesafe_cb_postargs.c
-rw-r--r-- 581 compile_fail-typesafe_cb_preargs.c
-rw-r--r-- 1048 compile_ok-typesafe_cb-const.c
-rw-r--r-- 1060 compile_ok-typesafe_cb-volatile.c
-rw-r--r-- 3405 run.c