CMake should look for reqd python modules

[jcowles]

System Information (OS, Hardware, etc.)

Windows

Steps to Reproduce

1. Run CMake config without jinja2 installed

You get no message from CMake, just this traceback and configuration continues without error:

Traceback (most recent call last):
File "", line 1, in
ImportError: No module named jinja2

-- Configuring done
-- Generating done
-- Build files have been written to: C:/src/usd/stage/prereq/build/USD

It seems like all the python modules should be verified at first CMake setup to avoid late errors, here are the ones I've stumbled over:

• pyd
• pyopengl (required by usdview)
• jinja2

Note that PySide is already correctly checked.

[jcowles]

Also Enum, if you're verifying the generated code

[jtran56]

Filed as internal issue #139283.

[meshula]

If jinja2 and Enum are installed, does that allow the schema validation to properly complete? I'm currently supressing with -DPXR_VALIDATE_GENERATED_CODE=OFF