-O3 is perfectly safe in the absence of UB. And with UB, -O2 and friends can easily break with new compiler versions and such anyway.
In addition, I'd say that -O/-O1 is probably as risky as -O3 nowadays, if not more, because if nothing else, you don't get a bunch of hardening. Signed-off-by: Sam James <s...@gentoo.org> --- eclass/flag-o-matic.eclass | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/eclass/flag-o-matic.eclass b/eclass/flag-o-matic.eclass index 6bec3df308814..3dd39c54a5317 100644 --- a/eclass/flag-o-matic.eclass +++ b/eclass/flag-o-matic.eclass @@ -47,7 +47,7 @@ setup-allowed-flags() { # Note: shell globs and character lists are allowed _setup-allowed-flags() { ALLOWED_FLAGS=( - -pipe -O '-O[12sg]' '-mcpu=*' '-march=*' '-mtune=*' + -pipe -O '-O[123sg]' '-mcpu=*' '-march=*' '-mtune=*' # Hardening flags '-fstack-protector*' -- 2.40.1