Resolved Build fails with undefined symbol _ZN6il2cpp2os6Thread16HasCurrentThreadEv

I'm trying to build my game with WebGL, using Unity 2022.1.22f1 on Windows 10. However, WebGL builds fail with this error:

Code (csharp):

1. Building Library\Bee\artifacts\WebGL\build\debug_WebGL_wasm\build.js failed with output:
2. wasm-ld: warning: function signature mismatch: unity_debugger_agent_is_global_breakpoint_active
3. >>> defined as (i32) -> i32 in C:\\Users\\Jesse\\AppData\\Local\\Temp\\tmp1xadfdhsGameAssembly.a(uqj5_tils0.lump.o)
4. >>> defined as () -> i32 in C:\\Users\\Jesse\\AppData\\Local\\Temp\\tmp1xadfdhsGameAssembly.a(jo3y_gger-agent.o)
5. error: undefined symbol: _ZN6il2cpp2os6Thread16HasCurrentThreadEv (referenced by top-level compiled C/C++ code)
6. warning: Link with `-s LLD_REPORT_UNDEFINED` to get more information on undefined symbols
7. warning: To disable errors for undefined symbols use `-s ERROR_ON_UNDEFINED_SYMBOLS=0`
8. warning: __ZN6il2cpp2os6Thread16HasCurrentThreadEv may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
9. Error: Aborting compilation due to previous errors
10. emcc2: error: '"C:/Program Files/Unity/Hub/Editor/2022.1.22f1/Editor/Data/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/node/node.exe" "C:\Program Files\Unity\Hub\Editor\2022.1.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten\src\compiler.js" C:\Users\Jesse\AppData\Local\Temp\tmpe7d7j2du.txt' failed (1)
11. UnityEditor.BuildPipeline:BuildPlayer (UnityEditor.BuildPlayerOptions)

Any suggestions?

 

I'm not explicitly using C++ threads, but it's possible that one of my dependencies is. How can I check?

As for Unity 2022.2, I'll try it and report back. Thanks for the tip.

 

@unityruba No dice. I get this build error in 2022.2.0b14:

And when I do a clean build, wasm-ld takes an ungodly amount of time to execute. I'll try letting it run overnight, but I'm not confident it'll actually finish (since 2022.1.22's wasm-ld was still chugging along after 12 hours).

 

I'll give it a shot, thanks!

 

@unityruba Nope, back to square one. The symbol in this thread (_ZN6il2cpp2os6Thread16HasCurrentThreadEv) appears to be resolved, but now _ZN4FMOD12ChannelGroup21getAbsoluteAudibilityEPf isn't being found. Here's the error:

Code (csharp):

1. Building Library\Bee\artifacts\WebGL\build\debug_WebGL_wasm\build.js failed with output:
2. emcc: warning: USE_PTHREADS + ALLOW_MEMORY_GROWTH may run non-wasm code slowly, see https://github.com/WebAssembly/design/issues/1271 [-Wpthreads-mem-growth]
3. error: undefined symbol: _ZN4FMOD12ChannelGroup21getAbsoluteAudibilityEPf (referenced by top-level compiled C/C++ code)
4. warning: Link with `-s LLD_REPORT_UNDEFINED` to get more information on undefined symbols
5. warning: To disable errors for undefined symbols use `-s ERROR_ON_UNDEFINED_SYMBOLS=0`
6. warning: __ZN4FMOD12ChannelGroup21getAbsoluteAudibilityEPf may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
7. Error: Aborting compilation due to previous errors
8. emcc: error: '"C:/Program Files/Unity/Hub/Editor/2022.2.0b14/Editor/Data/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/node/node.exe" "C:\Program Files\Unity\Hub\Editor\2022.2.0b14\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten\src\compiler.js" C:\Users\Jesse\AppData\Local\Temp\tmp7d4l_mzl.json' failed (returned 1)
9. UnityEditor.BuildPipeline:BuildPlayer (UnityEditor.BuildPlayerOptions)

Some possibly relevant facts:

• I'm using Unity 2022.2.0b14.
• WebGL's debug symbol mode is set to External.
• WebGL's exception support is set to Full with Stacktrace.
• Analyze Build Size is set to true.
• WebGL threading support is set to true.
• IL2CPP compiler config is set to Debug.
• Managed stripping level is set to Low.
• The Development and AllowDebugging BuildOption flags are set.

 

In that case, I'll try again when that version launches and will report back with the results. Thanks!

 

That fixed the issue, thanks!

 

UnityEditor Version: 2022.1.9f1c1.3418.178
OS: Windows 11, 22H2
target platform: WebGL
development build: enable
WebGL threading support: false
C++ compiler configuration: Debug

error:

Building Library\Bee\artifacts\WebGL\build\debug_WebGL_wasm\build.js failed with output:
wasm-ld: warning: function signature mismatch: unity_debugger_agent_is_global_breakpoint_active
>>> defined as (i32) -> i32 in C:\\Users\\yukun\\AppData\\Local\\Temp\\tmp7i9zo62wGameAssembly.a(g9d6_tils0.lump.o)
>>> defined as () -> i32 in C:\\Users\\yukun\\AppData\\Local\\Temp\\tmp7i9zo62wGameAssembly.a(obpb_gger-agent.o)
error: undefined symbol: _ZN6il2cpp2os6Thread16HasCurrentThreadEv (referenced by top-level compiled C/C++ code)
warning: Link with `-s LLD_REPORT_UNDEFINED` to get more information on undefined symbols
warning: To disable errors for undefined symbols use `-s ERROR_ON_UNDEFINED_SYMBOLS=0`
warning: __ZN6il2cpp2os6Thread16HasCurrentThreadEv may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
Error: Aborting compilation due to previous errors
emcc2: error: '"C:/Program Files/Unity/Hub/Editor/2022.1.9f1c1/Editor/Data/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/node/node.exe" "C:\Program Files\Unity\Hub\Editor\2022.1.9f1c1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten\src\compiler.js" C:\Users\yukun\AppData\Local\Temp\tmpqcprjayo.txt' failed (1)
UnityEngine.GUIUtilityrocessEvent (int,intptr,bool&)


But:
1. if I disable development build, the error gone.
2. if I trigger the build in C# script instead of click the "Build and Run" button on "File" menu, the error gone, no matter I enable or disable development build.

Code (CSharp):

1.         BuildPlayerOptions buildPlayerOptions = new()
2.         {
3.             scenes = new[] { "Assets/Scenes/MappingScene.unity" },
4.             locationPathName = versionPath + "/" + dirName + (target != BuildTarget.WebGL ? "/" + applicationName : ""),
5.             target = target,
6.             options = development ? BuildOptions.Development : BuildOptions.None,
7.             extraScriptingDefines = new string[] { "HAVE_DATE_TIME_OFFSET" }  // for Newtonsoft.Json.Schema
8.         };
9.  
10.         BuildReport report = BuildPipeline.BuildPlayer(buildPlayerOptions);
11.         BuildSummary summary = report.summary;
12.