Unsolved How to build a Windows 64-bit Qt app using MinGW-64-bit
I want to build a Windows 64-bit version of a Qt 5.9 application using MinGW-64 with Qt Creator (NOT MS Visual Studio). Where can I find the most relevant and straight-forward instructions to accomplish this? Thanks.
You first have to build a 64bit Qt with MinGW. This wiki article might help you get started.
Hope it helps