Hi,
Compiling under Windows is certainly possible, but to be honest, we will not do it since many years now. All is cross-compiled under Linux.
When i said all, it's from the start to the installer. There is no Windows stuff used in this task. This have the most advantage to simplified the workflow : all is done on the same computer used for the main development under Linux.
No Windows, no Microsoft compiler, no extra proprietary libraries, no virus risk. Well a pleasure for a developers.
If you is interested, all is explained here :
Note : The MacOS bundle still compiled under MacOS, but it's technically possible to cross compile with clang under Linux, there is no framework as MXE cross compiler for Windows available for Apple device.
Best
Gilles Caulier