[Qt-interest] QtHelp module dependencies

[Thiago Macieira]

On Sunday, 31 de July de 2011 01:26:15 Constantin Makshin wrote:
> Hello!
> 
> Mkspecs file for the QtHelp module (mkspecs/features/help.prf) contains line
> QT += xml sql
> 
> The problem is that QtHelp module doesn't use any XML-related classes except
> QXmlStream*. And since these classes were moved to QtCore some time ago (in
> Qt 4.7.0 or even earlier), "QT += xml" part of the statement causes
> unneccessary dependency in applications that use QtHelp to show their
> documentation — QXmlStream* classes were left in QtXml for backward
> compatibility, so the linker can't determine whether this library is really
> needed or not and puts it to the list of used libraries. This behavior
> creates some problems related primarily to packaging/distribution of such
> Qt applications — wasted space in all-in-one packages, redundant
> dependencies in Linux packages, etc.
> 
> The question is:
> Was this dependency left intentionally or did Qt developers simply forget to
> remove it when they moved QXmlStream* classes to the QtCore library?

QtHelp was designed in Qt 4.4, which is the same release that moved the 
streaming XML classes to QtCore. So this is an oversight.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
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