Formerly my gentoo-cflags. gcf2 is a collection of personal cflags profiles for the portage build system.
- Backup make.conf, env/*, bashrc before using gcf2. These will be clobbered
when restoring a profile. This can be done with
--save-profile=name. - It is assumed that you will make additional changes to make.conf to work with your personal setup.
- It is a hard requirement to have a Rescue CD/USB especially with CFI ON. SystemRescue can be used.
./gcf2 --help - Gets help
./gcf2 --save-profile=name - Saves profile as name
./gcf2 --restores-profile=name - Restores profile from profiles/name
EROOT - The absolute path to the root of an existing installation. (It can be unset or be empty if CHOST == CBUILD.)
- gaming - optimizes for install time while maintaining decent runtime performance while sacrificing security. Anti premature optimization. Anti security. (Development is active)
- minmax-2018 - Hardened GCC with systemwide Retpoline with -O3. No LTO.
- minmax-v1 - LTO based profile which can be configured for CFI. It comes with an blacklist/whitelist LTO generator to prevent IR incompatibilities. (Development is End of Life [EOL])
- minmax-v2 - LTO based profile with dynamically generated profiles with O(1) MLOC estimator to auto tag packages needing Ccache or -O1, auto tag -O3 or -Ofast based on matching keyword ebuild scans, auto disables fast-math sub-options with violations to minimize ffast-math related bugs. Includes minmax-v1 LTO generators. (Development is on ice)
Refer to profiles//README.md or profiles//docs for more information.
Initially, it was decided to unify all profiles with minmax-v2 but at the same time have the capability to switch between cflag profiles for seasonal reasons like summer for gaming and winter for security. gcf2 is created as a result.
The bashrc maybe moved or copied, and clobbered when restoring. If you have customizations, you need to add them back.