Use -O not -O3: reduces ccan/tdb test time from 24 to 18 seconds.
[ccan] / tools / ccanlint /
drwxr-xr-x   ..
-rw-r--r-- 1144 Makefile
-rw-r--r-- 7121 ccanlint.c
-rw-r--r-- 4895 ccanlint.h
drwxr-xr-x - compulsory_tests
-rw-r--r-- 12118 file_analysis.c
drwxr-xr-x - test
drwxr-xr-x - tests