Use -O not -O3: reduces ccan/tdb test time from 24 to 18 seconds.
[ccan] / ccan / talloc_link /
drwxr-xr-x   ..
-rw-r--r-- 3447 _info
-rw-r--r-- 2182 talloc_link.c
-rw-r--r-- 1552 talloc_link.h
drwxr-xr-x - test