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Unable to export to WebGL with Unity 6 #75

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tarragonfly opened this issue Nov 21, 2024 · 2 comments
Closed

Unable to export to WebGL with Unity 6 #75

tarragonfly opened this issue Nov 21, 2024 · 2 comments

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@tarragonfly
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tarragonfly commented Nov 21, 2024 •
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Unity 6 released a while ago and is considered an LTS release by the new Unity release standards but WebGL export is currently non-functional when trying to export Rive getting-started example project from here: https://github.com/rive-app/rive-unity-examples/tree/main/getting-started

Unity: 6000.0.26f1
Rive runtimes: 2.1.0

Building Library\Bee\artifacts\WebGL\build\debug_WebGL_wasm\build.js failed with output:
wasm-ld: error: Library/PackageCache/app.rive.rive-unity/Runtime/Libraries/WebGL/librive_wasm.a(artboard.o): undefined symbol: std::__2::__vector_base_common<true>::__throw_length_error() const
emcc: error: 'C:/GameDev/6000.0.26f1/Editor/Data/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/llvm\wasm-ld.exe @C:\Users\gdev\AppData\Local\Temp\emscripten_7f06ey06.rsp.utf-8' failed (returned 1)

UnityEditor.BuildPlayerWindow:BuildPlayerAndRun ()
@damzobridge
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Hmm, it seems like something changed with Emscripten in Unity 6. We're looking into it.

rive-engineering pushed a commit that referenced this issue Jan 7, 2025
@damzobridge
fix: unity 6 webGL compilation and build issue
21c3cf4 
This PR addresses [this reported issue](#75) that prevents WebGL builds with Rive from working in Unity 6. This is happening because Unity [updated their Emscripten version](https://docs.unity3d.com/6000.0/Documentation/Manual/webgl-native-plugins-with-emscripten.html) in Unity 6, requiring libraries to be built with the newer version.

The main challenge is that the new version (`Emscripten 3.1.38-unity`) isn’t backwards-compatible, which breaks Rive in older Unity versions. To address this, we now build two separate WebGL libraries to support both the new and old Emscripten versions.

Another challenge is that Unity doesn’t easily allow conditionally including native plugins based on Unity or Emscripten versions. To work around this, I'm conditionally including the appropriate library at build time.

Diffs=
e01747467b fix: unity 6 webGL compilation and build issue (#8828)

Co-authored-by: Adam <[email protected]>
@damzobridge
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This should be resolved as of v0.3.2. Please let us know if that doesn't address it for you.

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@damzobridge @tarragonfly