hardened -> desktop switch

[LukynZ]

Is entire world reemerge really necessary? Or just packages with pax_kernel use flag and gcc itsefl will be fine?

[Moonboots]

Is entire world reemerge really necessary? Or just packages with pax_kernel use flag and gcc itsefl will be fine?

Certainly when you change from a hardened profile you're going to lose the "hardened" flag and gain some others that were previously masked.
emerge --newuse etc will reveal those packages that are in need of re-emerging.
Weather you need to re-emerge the entire world i'm not sure, perhaps if there are no problems ?........

[mv]

After emerging hardened gcc you should recompile everything in order to make use of the hardened CFLAGS which implicitly go with hardened gcc.
Otherwise, your binaries will e.g. not use PIE, even if corresponding support is activated in your kernel.

[Moonboots]

After emerging hardened gcc you should recompile everything in order to make use of the hardened CFLAGS which implicitly go with hardened gcc.
Otherwise, your binaries will e.g. not use PIE, even if corresponding support is activated in your kernel.

Unless I've misread the post he wants to go in the opposite direction ie from a hardened to non-hardened profile (desktop) ?

[mv]

Unless I've misread the post he wants to go in the opposite direction

That should be no problem. Of course, the binaries will remain slower (e.g. because of the implicit -fstack-protector-all) until recompiled.