Use -O not -O3: reduces ccan/tdb test time from 24 to 18 seconds.
[ccan] / ccan / tdb / tools /
drwxr-xr-x   ..
-rw-r--r-- 989 Makefile
drwxr-xr-x - benchmarks
-rw-r--r-- 7911 keywords.c
-rw-r--r-- 2287 keywords.gperf
-rw-r--r-- 52590 replay_trace.c
-rw-r--r-- 2560 tdbdump.c
-rw-r--r-- 6883 tdbtorture.c
drwxr-xr-x - tests