[gentoo-dev] Re: [gentoo-commits] gentoo-x86 commit in games-board/gnugo: gnugo-3.9.1-r1.ebuild ChangeLog

[Michael Palimaka]

On 02/06/15 23:52, Mike Frysinger wrote:
> On 02 Jun 2015 23:07, Michael Palimaka wrote:
>> On 02/06/15 21:38, Mike Frysinger wrote:
>>> On 02 Jun 2015 20:47, Michael Palimaka wrote:
>>>> On 02/06/15 17:04, Michał Górny wrote:
>>>>> Dnia 2015-06-02, o godz. 03:58:35
>>>>> "Michael Sterrett (mr_bones_)" <mr_bones_@g.o> napisał(a):
>>>>>> -DEPEND="readline? ( sys-libs/readline )
>>>>>> +DEPEND="readline? ( sys-libs/readline:0 )
>>>>>
>>>>> This should be actually := (or :0=) for both deps since gnugo links to
>>>>> them. This also applies to your remaining 'warning silencing' commits.
>>>>
>>>> Why? Blindly adding the subslot dep is a bad idea.
>>>
>>> in this particular case, the subslot usage is what we want since we're
>>> compiling+linking against it.  using readline:0 vs readline is still an
>>> improvement though.
>>>
>>> we also want a subslot on ncurses since we compile+link against it.
>>>
>>> i think it's pretty uncommon to use readline in a package and not want a
>>> subslot.  your package would have to be doing something uncommon like
>>> dlopening it since the only thing readline provides is a library ...
>>
>> Neither readline nor ncurses define an explicit subslot, so I don't know
>> what their future meaning might be.
>
> their meaning would be the reasonable one -- to track the SONAME.  while it
> hasn't been deployed yet (due to those packages being on EAPI=4), i don't know
> what other value you'd expect it to be.  they've both broken their SONAMEs in
> the past.  readline in particular has been every major version (4.x, 5.x, 6.x).
> -mike
>

Since you've clarified the future meaning for ncurses/readline, it's not
a problem.

The point was it's not a good idea to use the operator unless without
knowing what it means for the package in question (since a subslot can
be used to handle a number of different situations, as I wrote previously).