Bug Unable to build IL2CPP in Unity 2021.3.8f1

Hi there,

I'm trying to build in IL2CPP but I keep getting errors. In Mono it seems to work fine but I can't fix this IL2CPP error no matter what I try.

What I have:
- Unity Hub: IL2CPP module installed
- VS: Practically everything installed except "Other toolsets",. I also added Windows 11 SDK and the v142 modules.

The errors I get:

1.

Spoiler: Error 1

Code (CSharp):

1. Building Library\Bee\artifacts\WinPlayerBuildProgram\ei6vj\ccap_u_vm6.lump.obj failed with output:
2. 5ihu_vm6.lump.cpp
3. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\utils\Il2CppHashMap.h(71): error C2039: 'hash_compare': is not a member of 'stdext'
4. C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.35.32215\include\iterator(1447): note: see declaration of 'stdext'
5. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\utils\Il2CppHashMap.h(71): error C2065: 'hash_compare': undeclared identifier
6. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\utils\Il2CppHashMap.h(71): error C2275: 'Key': expected an expression instead of a type
7. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(38): error C2976: 'Il2CppReaderWriterLockedHashMap': too few template arguments
8. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\utils\Il2CppHashMap.h(75): note: see declaration of 'Il2CppReaderWriterLockedHashMap'
9. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(38): error C2955: 'Il2CppReaderWriterLockedHashMap': use of class template requires template argument list
10. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\utils\Il2CppHashMap.h(75): note: see declaration of 'Il2CppReaderWriterLockedHashMap'
11. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(47): error C2955: 'Il2CppReaderWriterLockedHashMap': use of class template requires template argument list
12. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\utils\Il2CppHashMap.h(75): note: see declaration of 'Il2CppReaderWriterLockedHashMap'
13. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(385): error C2662: 'bool Il2CppReaderWriterLockedHashMap<Key,T,HashFcn,EqualKey,Alloc>::TryGet(const Il2CppHashMap<Key,T,HashFcn,EqualKey,Alloc>::key_type &,T *)': cannot convert 'this' pointer from 'PointerTypeMap' to 'Il2CppReaderWriterLockedHashMap<Key,T,HashFcn,EqualKey,Alloc> &'
14. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(385): note: Reason: cannot convert from 'PointerTypeMap' to 'Il2CppReaderWriterLockedHashMap<Key,T,HashFcn,EqualKey,Alloc>'
15. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(385): note: Conversion requires a second user-defined-conversion operator or constructor
16. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\utils\Il2CppHashMap.h(90): note: see declaration of 'Il2CppReaderWriterLockedHashMap<Key,T,HashFcn,EqualKey,Alloc>::TryGet'
17. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(385): note: while trying to match the argument list '(Il2CppClass *, Il2CppClass **)'
18. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(438): error C2662: 'bool Il2CppReaderWriterLockedHashMap<Key,T,HashFcn,EqualKey,Alloc>::Add(const Il2CppHashMap<Key,T,HashFcn,EqualKey,Alloc>::key_type &,const T &)': cannot convert 'this' pointer from 'PointerTypeMap' to 'Il2CppReaderWriterLockedHashMap<Key,T,HashFcn,EqualKey,Alloc> &'
19. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(438): note: Reason: cannot convert from 'PointerTypeMap' to 'Il2CppReaderWriterLockedHashMap<Key,T,HashFcn,EqualKey,Alloc>'
20. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(438): note: Conversion requires a second user-defined-conversion operator or constructor
21. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\utils\Il2CppHashMap.h(102): note: see declaration of 'Il2CppReaderWriterLockedHashMap<Key,T,HashFcn,EqualKey,Alloc>::Add'
22. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(438): note: while trying to match the argument list '(Il2CppClass *, Il2CppClass *)'
23. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(1135): error C2955: 'Il2CppReaderWriterLockedHashMap': use of class template requires template argument list
24. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\utils\Il2CppHashMap.h(75): note: see declaration of 'Il2CppReaderWriterLockedHashMap'
25. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(1135): error C2662: 'Il2CppHashMap<Key,T,HashFcn,EqualKey,Alloc>::iterator Il2CppReaderWriterLockedHashMap<Key,T,HashFcn,EqualKey,Alloc>::UnlockedBegin(void)': cannot convert 'this' pointer from 'PointerTypeMap' to 'Il2CppReaderWriterLockedHashMap<Key,T,HashFcn,EqualKey,Alloc> &'
26. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(1135): note: Reason: cannot convert from 'PointerTypeMap' to 'Il2CppReaderWriterLockedHashMap<Key,T,HashFcn,EqualKey,Alloc>'
27. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(1135): note: Conversion requires a second user-defined-conversion operator or constructor
28. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\utils\Il2CppHashMap.h(121): note: see declaration of 'Il2CppReaderWriterLockedHashMap<Key,T,HashFcn,EqualKey,Alloc>::UnlockedBegin'
29. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(1135): note: while trying to match the argument list '()'
30. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(1135): error C2662: 'Il2CppHashMap<Key,T,HashFcn,EqualKey,Alloc>::iterator Il2CppReaderWriterLockedHashMap<Key,T,HashFcn,EqualKey,Alloc>::UnlockedEnd(void)': cannot convert 'this' pointer from 'PointerTypeMap' to 'Il2CppReaderWriterLockedHashMap<Key,T,HashFcn,EqualKey,Alloc> &'
31. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(1135): note: Reason: cannot convert from 'PointerTypeMap' to 'Il2CppReaderWriterLockedHashMap<Key,T,HashFcn,EqualKey,Alloc>'
32. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(1135): note: Conversion requires a second user-defined-conversion operator or constructor
33. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\utils\Il2CppHashMap.h(127): note: see declaration of 'Il2CppReaderWriterLockedHashMap<Key,T,HashFcn,EqualKey,Alloc>::UnlockedEnd'
34. C:\Program Files\Unity\Hub\Editor\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\vm\MetadataCache.cpp(1135): note: while trying to match the argument list '()'
35. UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)
36.  

2.

Spoiler: Error 2 (seems easy enough this one - though setting is removed in this version of Unity

Code (CSharp):

1. BuildFailedException: Incremental Player build failed!
2. UnityEditor.Modules.BeeBuildPostprocessor.PostProcess (UnityEditor.Modules.BuildPostProcessArgs args) (at <5f40cdb07bd44d76a23dad985a4ec283>:0)
3. UnityEditor.Modules.DefaultBuildPostprocessor.PostProcess (UnityEditor.Modules.BuildPostProcessArgs args, UnityEditor.BuildProperties& outProperties) (at <5f40cdb07bd44d76a23dad985a4ec283>:0)
4. UnityEditor.WindowsStandalone.WinPlayerPostProcessor.PostProcess (UnityEditor.Modules.BuildPostProcessArgs args, UnityEditor.BuildProperties& outProperties) (at C:/buildslave/unity/build/PlatformDependent/WinPlayer/Extensions/Managed/WinPlayerPostProcessor.cs:38)
5. UnityEditor.PostprocessBuildPlayer.Postprocess (UnityEditor.BuildTargetGroup targetGroup, UnityEditor.BuildTarget target, System.Int32 subtarget, System.String installPath, System.String companyName, System.String productName, System.Int32 width, System.Int32 height, UnityEditor.BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.Build.Reporting.BuildReport report) (at <5f40cdb07bd44d76a23dad985a4ec283>:0)
6. UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)
7.  

3.

Spoiler: Error 3. Caused by other 2 - adding for ref

Code (CSharp):

1. Build completed with a result of 'Failed' in 63 seconds (62941 ms)
2. UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

4.

Spoiler: Error 4. Same story as error 4. Just adding for ref

Code (CSharp):

1. UnityEditor.BuildPlayerWindow+BuildMethodException: 3 errors
2.   at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (UnityEditor.BuildPlayerOptions options) [0x002da] in <5f40cdb07bd44d76a23dad985a4ec283>:0
3.   at UnityEditor.BuildPlayerWindow.CallBuildMethods (System.Boolean askForBuildLocation, UnityEditor.BuildOptions defaultBuildOptions) [0x00080] in <5f40cdb07bd44d76a23dad985a4ec283>:0
4. UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)
5.  

If anyone can help with this, that would be great. I am really lost as to why this is not working at this point now that pretty much everything is installed.

 

Update:
After this, In desperation I upgraded to a different Unity version. (2021.3.21f1) and magically it worked.

Seems the Unity version is the problem.