Created attachment 403760 [details, diff] patch to add the QT_NO_QWARNING_MACRO qtquickcontrols-5.4.1 use the macro QT_NO_QWARNING_MACRO which isn't contained in the qt5 headers. Simply copying the macro definition from the qt4 headers does the job.
What is the problem you are trying to solve?
(In reply to Davide Pesavento from comment #1) > What is the problem you are trying to solve? Quite simple, I'd like to emerge it. As I said before, it doesn't compile here without my patch.
(In reply to Helmut Jarausch from comment #2) > As I said before, it doesn't compile here without my patch. No, you never said that before. Also, you're supposed to attach your emerge --info and a full build.log of the failure, especially since I cannot reproduce it.