Use -O not -O3: reduces ccan/tdb test time from 24 to 18 seconds.
[ccan] / ccan / ciniparser / test /
drwxr-xr-x   ..
-rw-r--r-- 5275 run-dictionary.c
-rw-r--r-- 2212 run.c
-rw-r--r-- 285 test.ini