WebGL Build Error

[roiderhl]

What happened?

Environment
Cesium for Unity version:1.20.0
Unity Editor Version:2022.3.62f3
Test Project:CesiumForUnitySamples-v1.20.0

Build Error:
Building Library\Bee\artifacts\WebGL\build\debug_WebGL_wasm\build.js failed with output:
wasm-ld: warning: function signature mismatch: time

defined as (i32) -> i64 in ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/lib/libspdlog.a(spdlog.cpp.o)
defined as (i32) -> i32 in C:\Program Files\Unity\Hub\Editor\2022.3.62f3c1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten\cache\sysroot\lib\wasm32-emscripten\libc.a(emscripten_time.o)

wasm-ld: warning: function signature mismatch: _ZNSt3__26chrono12system_clock9to_time_tERKNS0_10time_pointIS1_NS0_8durationIxNS_5ratioILx1ELx1000000EEEEEEE

defined as (i32) -> i64 in ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/lib/libspdlog.a(spdlog.cpp.o)
defined as (i32) -> i32 in C:\Program Files\Unity\Hub\Editor\2022.3.62f3c1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten\cache\sysroot\lib\wasm32-emscripten\libc++.a(chrono.o)

wasm-ld: warning: function signature mismatch: mktime

defined as (i32) -> i64 in ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/lib/libabsl_time_zone.a(time_zone_libc.cc.o)
defined as (i32) -> i32 in C:\Program Files\Unity\Hub\Editor\2022.3.62f3c1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten\cache\sysroot\lib\wasm32-emscripten\libc.a(emscripten_time.o)

wasm-ld: warning: function signature mismatch: difftime

defined as (i64, i64) -> f64 in ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/lib/libCesiumAsync.a(CachingAssetAccessor.cpp.o)
defined as (i32, i32) -> f64 in C:\Program Files\Unity\Hub\Editor\2022.3.62f3c1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten\cache\sysroot\lib\wasm32-emscripten\libc.a(difftime.o)

wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: ThirdPart/com.cesium.unity@1.20.0/Plugins/WebGL/libCesiumForUnityNative-Runtime.a(CesiumCreditSystem.cpp.o): undefined symbol: __wasm_lpad_context
wasm-ld: error: too many errors emitted, stopping now (use -error-limit=0 to see all errors)
emcc: error: '"C:/Program Files/Unity/Hub/Editor/2022.3.62f3c1/Editor/Data/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/llvm\wasm-ld.exe" @C:\Users\ADMINI~1\AppData\Local\Temp\emscripten_p1e21t1b.rsp.utf-8' failed (returned 1)

UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

Environment

Cesium for Unity version:
Unity Editor Version:
Operating System:

Reproduction steps

...

Supporting evidence

No response

[brendan-duncan]

WebGL build requires Unity 6+, specifically to be able to enable the "Native C/C++ Multithreading" option in the web player settings. The unfortunate side effect of not enabling this build setting, is obscure linker errors.

[TerraSame]

Hi... As Brendan mentioned, Multi Threading needs to be on in project settings and then you also need to create an htacess file as per documentation and include in your folder on your server....
Good Luck!

[j9liu]

Thanks @brendan-duncan and @TerraSame for your input! These limitations are now addressed in the "Supported Platforms" page on our reference documentation site: https://cesium.com/learn/cesium-unity/ref-doc/supported-platforms.html

Since there's nothing actionable on our end, I'm going to close this issue. If you continue to experience trouble, feel free to post on our community forum.

[roiderhl]

Thank you for your answers.