Question Error building WebGL in 2021.2.5f1 - ebug_WebGL_wasm\build.js: undefined symbol

EDIT : Resolved, it seems in Unity 2021 strict name checking was turned on for function references in .jslib files. So make sure all calls to DllImport do indeed have a matching case-sensitive function name in a .jslib file.

There is also a '-s ERROR_ON_UNDEFINED_SYMBOLS=0' command line argument which may get around this issue.

Code (CSharp):

1. [DllImport("__Internal")]
2.     private static extern void OpenRewardedVideo();

I was building on Unity 2020 just fine, after upgrading to 2021, I now get this error...

Code (CSharp):

1. Library\Bee\artifacts\WebGL\build\debug_WebGL_wasm\build.js: undefined symbol: openRewardedVideo (referenced by top-level compiled C/C++ code)

openRewardedVideo resides in a .jslib script I have in Plugins/WebGL, I use it to call an openRewardedVideo javascript function in the web page hosting the game. The script .jslib script looks like this...

Code (JavaScript):

1. mergeInto(LibraryManager.library, {
2.   OpenURL: function (url) {
3.     window.open(Pointer_stringify(url), '_blank');
4.   },
5.   OpenRewardedVideo: function () {                      
6.     openRewardedVideo();
7.   },
8.   OpenInterstitial: function () {                          
9.     openInterstitial();
10.   }
11. });

Thanks

 

I just started getting this error and it is driving me crazy. Can you please clarify how I implement your solution?

 

For those wondering how to use the '-s ERROR_ON_UNDEFINED_SYMBOLS=0' argument:

• Go to ProjectSettings folder and open ProjectSettings.asset
• Search for webGLEmscriptenArgs
• Add the argument in front of it, like

  webGLEmscriptenArgs: -s ERROR_ON_UNDEFINED_SYMBOLS=0

That solved the issue for me

 

Hey. I am having the same problem after upgrading from Unity 2022 LTS to 2023. My function names are case sensitive. I have tried deleting the Library folder too. And I have also tried the above solution of adding webGLEmscriptenArgs but none is helping.

 

That works for me ! Thank you so much !
i had try so much solution read on differents forums before whitout success until that.