Re: [gentoo-user] newuse vs changed-use (and python3_6)

[allan gottlieb]

On Thu, Jul 19 2018, Roger J. H. Welsh wrote:

>>     emerge --pretend --newuse ... @world
>> shows 15 rebuilds while --changed-use shows none.
> --changed-use prevents your system from remerging packages
> due to USE flag changes upstream (not made by you).
>
>>    eselect python show
>> indicates python3.4, which I realize has end of life next year.
>>
>> Any advice would be appreciated.
> Note that, portage will want to use the new python targets immediately.
>
> Set for portage, for your next upgrade:
>     PYTHON_TARGETS="python2_7 python3_4 python3_6"
>     PYTHON_SINGLE_TARGET="python3_4"
>
> Set for portage, for your next upgrade after that:
>     PYTHON_TARGETS="python2_7 python3_6"
>     PYTHON_SINGLE_TARGET="python3_6"
>
> Migrate via,
> `emerge --ask --depclean && emerge -1vUD @world && emerge --ask --depclean`
>
> And you should be good to go.
>
> NOTES:
> `man emerge`
>   `/changed-use`
>
> "Unlike --newuse, the --changed-use option does not trigger
> reinstallation when flags that the user has not enabled are added or
> removed."
> `emerge --newuse @world` should fix you up here.
>
> From the news item,
> `eselect news read`
> `2018-05-22-python3-6`
> On *2018-06-22*, Python 3.6 will replace Python 3.5 in the default Python
> targets for Gentoo systems.  The new default targets will be:
>     PYTHON_TARGETS="python2_7 python3_6"
>     PYTHON_SINGLE_TARGET="python3_6"
>
> Hope this helps.
> --
>
> Roger Welsh
> fpr: 2FCB 9E31 EA77 CDEC A3AE  5DD7 D54C C777 553A 180D

Thank you.
allan