[Interest] Use Qt release DLLs while debugging application

[Hamish Moffatt]

This must be an FAQ, but can I use the Qt release mode DLLs while 
running my application compiled for debug? (In Visual Studio 2015, Qt 5.8).

I looked through the mkspecs and it doesn't seem possible. The 
qtPlatformTargetSuffix function defined in qt_functions.prf always adds 
the d suffix when compiling for debug.


I ask because I'm not debugging Qt, and the XML parsing in Qt5Xml seems 
to be horrendously slow in debug mode. It's using 45% of my total CPU 
time, versus 11% in release mode. I'm not actively debugging anything 
remotely related to XML but this is killing debug time for me.


Hamish