Re: [gentoo-dev] Re: Fwd: Heads up for Qt5

[Davide Pesavento <pesa@gentoo.org>]

On Fri, Jul 27, 2012 at 11:27 PM, Ben de Groot <yngwin@gentoo.org> wrote:
> On 28 July 2012 13:59, Nikos Chantziaras <realnc@gmail.com> wrote:
>> On 28/07/12 08:22, Ben de Groot wrote:
>>>
>>> In preparation for that, we want to ask maintainers of all ebuilds in
>>> the tree with dependencies on Qt4, to make sure that they have the
>>> proper slot. Otherwise your package may pull in Qt5 while it may not
>>> in fact support it.
>>
>>
>> This can be trouble if the application actually works with Qt5.  It might
>> depend on Qt4 but has no problems with Qt5 (contrary to Qt3 vs Qt4, Qt5 is
>> mostly compatible with much of existing Qt4 code), needlessly pulling-in
>> Qt4.  Many applications simply build and run as-is and no code changes are
>> necessary.
>>
>> So what would be the methodology of making sure a package has the proper
>> slot?
>
> Obviously you would need to make sure that the package actually does
> support Qt5. Then, as I see it, we could do either:
>
> || ( x11-libs/qt-gui:4 x11-libs/qt-gui:5 )
>

This is wrong because qt4 and qt5 are not binary compatible.

> or:
>
> qt4? ( x11-libs/qt-gui:4 )
> qt5? ( x11-libs/qt-gui:5 )
>

This is the only alternative AFAICS.

Thanks,
Pesa