[Bug 43222] Add Qt5 support

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=43222

Olli Salli <ollisal at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement
           Priority|medium                      |highest

--- Comment #2 from Olli Salli <ollisal at gmail.com> 2011-11-24 07:15:55 PST ---
Summary of current faults from private correspondence:

* The user must be able to choose whether to build a qt4 or qt5 lib even if
pkgconfig finds both, as it will in real world systems where qt4 and qt5 will
co-exist for a long time

* The built library must be named such that versions built for qt4 and qt5 can
be parallel installed

* We must have a summary of backwards incompat changes in NEWS to enable people
to know how to port

* Conditional compilation to pass the right constants to attain the API's
*default behavior* should not be required of the API's user (despite semantics
change in QHostAddress::Any between qt4 and qt5). We must abstract away such
things.

* All of the API break TODO/FIXME notes must be tackled before declaring stable
>= 0.9 API. Better to do in a separate branch as they're nothing qt5 specific,
although some have already been mixed in with this current branch. I've created
bug 43223 for this.

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