Re: [gentoo-user] Re: Gcc 5.3

[David Haller]

Hello,

On Tue, 29 Dec 2015, lee wrote:
>Andrew Savchenko <bircoph@g.o> writes:
>> There will be no 5.3.1 likely. Numeration scheme is changed from 5.x
>> series: what was middle version is now major, what was minor is now
>> middle. So 5.3 is a patch version of 5.0 the same as 4.9.3 is a
>> patch version of 4.9.0.
>
>What do you currently get as default when you update, and can you easily
>go back to a previous version, or have several versions installed and
>switch between them?

I'd guess 4.9.3. And yes and yes.

# eix sys-devel/gcc
[I] sys-devel/gcc
     Available versions:  
     (2.95.3) ~2.95.3-r10^s
     (3.3.6) (~)3.3.6-r1^s
     (3.4.6) 3.4.6-r2^s
     (4.0.4) **4.0.4^s
     (4.1.2) 4.1.2^s
     (4.2.4) (~)4.2.4-r1^s
     (4.3.6) 4.3.6-r1^s
     (4.4.7) 4.4.7^s
     (4.5.4) 4.5.4^s
     (4.6.4) 4.6.4^s
     (4.7)  4.7.4^s
     (4.8)  (~)4.8.0^s (~)4.8.1-r1^s (~)4.8.2^s 4.8.3^s 4.8.4^s 4.8.5^s
     (4.9)  ~*4.9.0^s ~*4.9.1^s (~)4.9.2^s 4.9.3^s{tbz2}
     (5)    **5.1.0^s **5.2.0^s (~)5.3.0^s{tbz2}
[..]
     Installed versions:  4.9.3(4.9)^s{tbz2}[..]
                          5.3.0(5)^s{tbz2}[..]
[..]

# gcc-config -l
 [1] x86_64-pc-linux-gnu-4.9.3 *
 [2] x86_64-pc-linux-gnu-5.3.0

Basically, you can install one of each slot, i.e. the first column in
() of the eix output. From (2.95.3) to (5). And switch as you like.

As 4.9.3 is marked stable, I guess that's what'd you get per default.

Stuff compiled with older gcc's should run with newer libgcc*[0], but
stuff compililed with a newer gcc might not run with the older
libgcc*. Same goes, with more problems IIRC, for libstdc++.
So beware of that. Apart from that? I'm not aware of problems.

BTW: why is gcc not also handled via eselect? Even if that'd just
call gcc-config?

HTH,
-dnh

[0] e.g. old Loki games, probably compiled with 2.95.x or even older
    still run fine on a system built with gcc-4.6

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