I am trying to build under Visual Studio (the 2019 release) and I'm encountering the following weird issue. In the project file PCbuild\_freeze_module.vcxproj there's a command that runs the Tools\scripts\deepfreeze.py script to generate some code.

The invocation is as follows:

    <Exec Command='$(PythonForBuild) "$(PySourcePath)Tools\scripts\deepfreeze.py" "%(None.OutFile)" "-m" "%(None.ModName)" -o "%(None.IntFile)"' />

Apparently the PythonForBuild variable is unset, because this steps is trying to *open* the deepfreeze.py script using the default app for opening .py files, which in my case is VS Code.

It seems that when using PCbuild\build.bat, PythonForBuild is set (on line 121) to %PYTHON%, which presumably points to some Python interpreter. But apparently when the build is driven by VS, this is not executed and now we're stuck.

Is there someone with enough MSBUILD skills to help me fix this?