Building a Qt for a WebAssembly application requires you to source the Emscripten environment file, so run this in your console command as follows:
source /path/to/emsdk/emsdk_env.sh
You will need to add the path to Qt for WebAssembly qmake as follows:
export PATH=/path/to/QtForWebAssembly/bin:$PATH.
Of course, you must replace /path/to with the actual filesystem path.
You are then ready for action! You build it just like any other Qt app, by running qmake as follows:
qmake mycoolapp.pro && make.
If you need to debug, rerun qmake with CONFIG+=debug as follows:
qmake CONFIG+=debug mycoolapp.pro && make.
This will add various Emscripten specific arguments to the compiler and linker.
Once it is built, you can run it by using the emrun command from Emscripten, which will start a simple web server and...
