Re: [gentoo-user] Re: upgrading to gcc-5 (on x86_64-pc-linux-gnu)

[allan gottlieb]

On Tue, Aug 08 2017, Nikos Chantziaras wrote:

> On 08/08/17 18:13, allan gottlieb wrote:
>> gcc-config -l reports
>>   [1] x86_64-pc-linux-gnu-4.9.3
>>   [2] x86_64-pc-linux-gnu-4.9.4 *
>>   [3] x86_64-pc-linux-gnu-5.4.0
>>
>> The news item from 2015-10-22 suggests (I have gentoolkit-0.3.3)
>>    # revdep-rebuild --library 'libstdc++.so.6' -- --exclude gcc
>>
>> Is that the entire procedure needed?  In particular, ignoring
>> performance, can I avoid emerge --emptytree and just execute?
>>
>>    # gcc-config x86_64-pc-linux-gnu-5.4.0
>>    # revdep-rebuild --library 'libstdc++.so.6' -- --exclude gcc
>
> That usually works. If you want to be 100% sure, you still need a full
> @system followed by a @world rebuild. But usually just rebuilding
> C++-linked packages will give you a stable system.
>
> I still recommend a @system rebuild at least though, since it's fast.

So you propose

    # gcc-config x86_64-pc-linux-gnu-5.4.0
    # revdep-rebuild --library 'libstdc++.so.6' -- --exclude gcc
    # emerge @system

I am at 98 of 122 for the revdep-rebuild.
I just looked and emerge @system would generate approx 50 merges.
The only one that looks long is gcc.
That seems unfortunate since I just activated that version of gcc and I
believe the gcc ebuild is a bootstrap so gcc-5 was compiled with gcc-5.
But I guess it might well link to other items that were compiled with
gcc-4.

I believe that, even though @world includes @system,
   emerge @system; emerge @world
differs from
   emerge @world

So there are many possibilities

1.  Stop after the revdep-rebuild
2.  emerge @system
3.  emerge --emptytree @system
4.  emerge @world
5.  emerge --emptytree @world
6.  emerge             @system; emerge             @world
7.  emerge --emptytree @system; emerge --emptytree @world

Which ones do you recommend?

thanks,
allan