Qt5 cmake stuff

[Alexander Neundorf]

On Monday 14 May 2012, David Faure wrote:
> On Monday 14 May 2012 23:13:44 Alexander Neundorf wrote:
> > if (NOT TARGET Qt5::Core)
> > 
> >   add_library(Qt5::Core SHARED IMPORTED)
> > 
> > endif()
> 
> Thanks, that works, and is MUCH simpler too ;-)
> 
> Any reason against committing that upstream? 

There was some subtle reason why this can have issues in some cases...
Stephen, what was it exactly ?
It was something with unexpected name clashes IIRC.
We need to be able to notice if somebody accidentially created a target with 
the same name already, and instead of silently not creating the imported 
target, fail. Was that it ?
If this way the reason, I'm not sure how realistic this is when we use 
"namespaced" imported targets as is done here (the "Qt5::").

> Requires a too recent cmake?

No, not at all.

Alex
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