(Preliminary)

Today (2020-08-27) I (cborn) managed to successfully create a static Windows build.

Here is a partial description of the final path I took.
If I get a chance to do a clean VM build I should be able to fill in any blanks.

This was on a Win7 box, I may try it on Win10 next.
Note that this WiKi entry should be updated with more details until it is a proper recipe for success!

– Instructions at https://www.msys2.org/
– Download installer https://repo.msys2.org/distrib/x86_64/msys2-x86_64-20200720.exe

Updating packages

pacman -Syuu
pacman -S package_name

Or install packages as required during attempted builds!

(Probably want to install default shared build as well)

pacman -S mingw-w64-x86_64-qt5-static

Not currently available as packages, so have to build them yourself!

-Clone the msys2/MINGW-packages repo https://github.com/msys2/MINGW-packages somewhere local

Fire up your Msys64 shell and:

git clone https://github.com/msys2/MINGW-packages.git
cd MINGW-packages
cd mingw-w64-kcoreaddons-qt5
KF5_VARIANT=static MINGW_INSTALLS=mingw64 makepkg-mingw -sLf
pacman -U mingw-w64-x86_64-kcoreddons-qt5-static-5.68.0-1-any.pkg.tar.zst
cd ..
cd cd mingw-w64-kwidgetsaddons-qt5
KF5_VARIANT=static MINGW_INSTALLS=mingw64 makepkg-mingw -sLf
pacman -U mingw-w64-x86_64-kwidgetsaddons-qt5-static-5.68.0-1-any.pkg.tar.zst

git clone --recursive https://github.com/qelectrotech/qelectrotech-source-mirror.git

Details to be added:

Run up qtcreator from your Msys64 shell
Create a static build package, based on the static qmake
Open the qelectrotech.pro project from the repo
Attempt a build from qtcreator (which fails for me) (static, release only. debug is HUGE!)
cd to the build directory where the qtcreator build failed

mingw32-make   

Which (for me) succeeds, despite appearing to run exactly the same commands that failed from qtcreator!
The whole install/build should be scriptable.