[Development] xcb-icccm dependency in Qt 5/libxcb

[Samuel Rødal]

On 10/25/2012 11:46 AM, Koehne Kai wrote:
>> -----Original Message-----
>> From: development-bounces+kai.koehne=digia.com at qt-project.org
>> [mailto:development-bounces+kai.koehne=digia.com at qt-project.org] On
>> Behalf Of Konstantin Tokarev
>> Sent: Thursday, October 25, 2012 11:33 AM
>> To: Thiago Macieira; development at qt-project.org
>> Subject: Re: [Development] xcb-icccm dependency in Qt 5/libxcb
>>
>> [..]
>> If system xlib is not xlib-xcb, it won't work properly if there are xlib calls
>> anywhere.
>
> Interesting. So far I thought xlib and xcb are completely independent, but it seems at least on Ubuntu that the old xlib was replaced by an xlib wrapper on top of xcb (XLibXcb)? Did I get that right? That would be the reason then why e.g. libXext has a dependency to libxcb on my Ubuntu 11.10.
>
> Anyway, depending on xcb.1.so isn't that bad, AFAICT. Where things are incompatible even between recent Linux distributions are some of the extensions (xcb-icccm, xcb-utils ...)

If the xcb plugin is configured and built on a system where the 
config.tests/qpa/xcb-xlib config test passes, and used on a system where 
it wouldn't have passed, the xcb plugin will not work. Maybe that's what 
Konstantin meant?

I guess the same goes for the xcb-poll-for-queued-event and xcb-glx, 
xcb-render, and xcb-poll-for-queued-event config tests.

--
Samuel