fatal error if KDE compiles with hidden visibility but Q_DECL_EXPORT is defined to nothing

[Matthias Kretz]

Hi,

as I just got my second report that phonon doesn't link I thought I'd better 
implement a check that errors out if Qt has been compiled without visibility 
support but KDE is compiled with default hidden visibility.

This is necessary for
1. phonon which uses Q_DECL_EXPORT as export macro
2. all plugins that export their entry symbols using Q_DECL_EXPORT or any 
other macro that uses Q_DECL_EXPORT

Ok, to commit the attached patch?

PS: please CC me on replys

-- 
________________________________________________________
Matthias Kretz (Germany)                            <><
http://Vir.homelinux.org/
MatthiasKretz at gmx.net, kretz at kde.org,
Matthias.Kretz at urz.uni-heidelberg.de
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