Gcc 6.4 upgrade - need rebuild whole system ?

[AdiosKid]

Hi folks, I read that on Gentoo news, about the update on system profile to them : https://www.gentoo.org/support/news-items/2017-11-30-new-17-profiles.html

and I ask if I need rebuild the whole system ? 

 

I mean, I was using gcc 5.4.0 and I upgrade to 6.4 both withour hardened, so I need rebuild ?

[palica]

Are you using funtoo and switching from 5.4.0 to 6.4.0? If yes then you need to:
 

gcc-config 2

. /etc/profile

emerge -e @system --exclude gcc

revdep-rebuild -L 'libstdc++.so.6' -- --exclude gcc

 

[AdiosKid]

but the 5.4 and 6.4 don't use compatibility ABI ?

[cardinal]

ABI issue was upgrade from gcc-4.9.3 to gcc-5.3.0

ABI compatibility is not an issue when upgrading from gcc-5.4.0 to gcc-6.4.0.

 

On 12/3/2017 at 4:56 AM, Otakku said:

Hi folks, I read that on Gentoo news, about the update on system profile to them : https://www.gentoo.org/support/news-items/2017-11-30-new-17-profiles.html

and I ask if I need rebuild the whole system ? 

 

I mean, I was using gcc 5.4.0 and I upgrade to 6.4 both withour hardened, so I need rebuild ?

Rebuild prevents future build failures if pie is enabled prior to building gcc-6.4.0

This is forced on gentoo stable amd64 when user switch's their gentoo profile from 13.0 to 17.0

Funtoo profile has PIE use masked for gcc.

/var/git/meta-repo/kits/core-kit/profiles/base/package.use.mask:sys-devel/gcc pie

I unmasked gcc-6.4.0 , left pie disabled, no rebuild of world was required.

funtoo rj # emerge -pv gcc

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild   R   #] sys-devel/gcc-6.4.0:6.4.0::core-kit  USE="cxx fortran nls openmp -ada (-altivec) -doc (-go) -graphite (-hardened) (-libssp) (-multilib) -objc -objc++ -pch (-pie) (-sanitize) -ssp -vanilla" 0 KiB

Total: 1 package (1 reinstall), Size of downloads: 0 KiB

 

 

 

[AdiosKid]

So, is not necessary rebuild all because the PIE on GCC 6.4.0, is disabled on Funtoo.