[Interest] QMake, (static) libraries and LTCG (LTO) on Mac

[Konstantin Tokarev]

> Hi,
> 
> I have made some tweaks to the qttools/src/assistant directories so that I can build the Assistant as a standalone application against any Qt install.

Note that you should be able to build whole qttools module against any Qt install. It should work without any modifications.

>To do that, I removed the qtNomakeTools(), load(qt_module) and load(qt_app) statements from the relevant .pro files, set up QtHelp to build as a static library and removed the `help` from `QT` in the Assistant's .pro file, replacing that with `LIB += -L../help -lQHelp`.
> 
> That works, and on Linux I can build the resulting application with LTO by adding `-config ltcg` to the qmake invocation. On Mac however that leads to a whole list of missing symbol errors in the final link step, all from the QtHelp library.
> 
> Am I doing something wrong or am I simply hitting a limitation?
> 
> Thanks,
> René
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-- 
Regards,
Konstantin