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Fixed in 2020.1.X

Fixed in 2019.2.X, 2019.3.X



Found in





Issue ID




[WebGL] Building fails with Emscripten's Python failure



To reproduce:
1) Open the attached project
2) Build it for WebGL

It fails with the following error: Failed running "E:\Stale Unities\2019.1\2019.1.0f2_f38a641b93e7\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten_Win\python\\python.exe" -E "E:\Stale Unities\2019.1\2019.1.0f2_f38a641b93e7\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emcc" @"E:\Downloads\case_1161712-Snail_Paradise\Assets\..\Temp\emcc_arguments.resp"

stderr:warning: unexpected number of arguments 1 in call to '__cxa_pure_virtual', should be 0warning: unexpected number of arguments 2 in call to '_ZN6il2cpp6icalls8mscorlib6System6String22RedirectToCreateStringEv' <..>

Not reproduced in 2019.2.0a3, 2019.1.0b4, 2018.4.2f1
Reproduced in 2019.2.0a6, 2019.1.0b5, 2019.3.0a6

  1. Response avatar

    Resolution Note (fix version 2020.1):

    Fixed in 2020.1.0a17, 2019.3.0f1, 2019.2.15f1

Comments (6)

  1. B5a5ab9b736cae2dfb4120c1d4f1280a?d=mm


    Dec 26, 2020 13:48

    I'm using 2019.2.1 but I've had a problem Uncaught abort("To use dlopen, you need to use Emscripten's linking support, see") at Error

  2. C1637eb56e4f113d9c489fbe82417e72?d=mm


    Nov 21, 2019 14:49

    i don't use PlayFab SDK
    but have similar issue on unity 2019.2.12f1

  3. 7cc0501dcfb253637f5643d25fb24cef?d=mm


    Oct 05, 2019 08:17

    This bug report does not reference PlayFab SDK, but based on and, I assume this bug report is about the detected breakage with respect to PlayFab SDK.

    A proper fix is being worked on. Meanwhile, when this error occurs with respect to using the PlayFab SDK, there is a potential workaround that one can add an Editor script to the build that executes

    PlayerSettings.WebGL.emscriptenArgs = "-s ERROR_ON_UNDEFINED_SYMBOLS=0";

    before running the build.

    If your project is not using the PlayFab SDK, and you are receiving an Emscripten python failure, please open a different bug report, since the root cause is definitely something else. (receiving a python error from Emscripten is a general "compiler aborted" message, that does not yet identify the actual cause of the abort)

  4. 9af654637311c8344627683330cefc49?d=mm


    Sep 30, 2019 18:07

    It has been 3 months, this particular bug causes playfab webgl not to work on 2019.2.x

    Can we get an update please? Why such large lead time?

  5. 992e0cf77598d457a5d83c6ab241b991?d=mm


    Sep 25, 2019 23:04

    Reproduced in 2019.2.6f1

  6. 7232d6eecf960548402252f672ec5dea?d=mm


    Jul 18, 2019 07:49

    Reproduced in 2019.1.1f1

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