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Postponed means that the issue was either a feature request or something that requires major refactoring on our side. Since that makes the issue not actionable in the close future we choose to close it as Postponed and add it on our internal roadmaps and technical debt pages instead.




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Issue ID




[WebGL] Building fails and Emscripten_Win errors are thrown when parameter WebGLThreadSupport is set to true

Web Platform


Reproduction steps:
1. Open the attached project ("")
2. Make a WebGL build

Expected result: Build succeeds
Actual result: Build fails; errors are thrown ("Failed running../Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\Emscripten_Win\python\\python.exe")

Reproducible with: 2020.1.1f1, 2020.1.3f1, 2020.2.0a17, 2020.2.0a21
Not reproducible with: 2019.4.8f1, 2020.1.0f1, 2020.2.0a1, 2020.2.0a16
Couldn't test with 2018.4.26f1 (WebGL threads not supported)

  1. Resolution Note:

    WebGLThreadSupport will be available in a future release of the Unity Editor. The team is tracking this as feature work.

Comments (1)

  1. stonstad

    Oct 05, 2020 14:14

    Any updates re: this bug?

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