[Development] Build Hotspots in the Qt build process

[Thiago Macieira]

Em qui 06 fev 2014, às 18:37:43, Shane McIntosh escreveu:
> > We've had precompilation support in qmake for a decade, but apparently we
> > use  that in exactly 3 modules...
> 
> Hmm, it could also be interesting to look into these modules to see if
> having them precompiled is justified by its hotness?

Well, think of me. I'm the QtCore maintainer. Every time I change qstring.h or 
qbasicatomic.h, EVERYTHING recompiles. Not even ccache can help me there. So 
if I can get stuff precompiled, it should be a win.

The very least we can do is "auto precompilation": for every Qt module, we 
know which modules it depends on, so we could generate a precompile header 
that #includes the dependent's master header.

But I was hoping for the next step: which headers of the *current* module are 
most in need of precompilation. For example, almost everything in QtWidgets 
will #include <qwidget.h>.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center