If flag-o-matic treats -O3 as a permitted flag, in UNSTABLE_FLAGS, I would really appreciate it if the individual components of O3 were also permitted. In practice, this means -finline-functions, -frename-registers, -fweb as well as their negations. I would also like to see -ftracer allowed.
That can't be done 100% clean, since different versions of gcc, implies different "auto" flags for the different -On levels.
agreed