使用 IL2CPP 在 Unity 中构建 Android App Bundle 的错误和失败

Question

I'm trying to build my Unity3D app as a.aab as Android Play Store requires this for new submissions now. Unfortunately i get errors and the build fails each time. I am using Unity editor version 2018.4.11f1 LTS and NDK version r16b. Any help is much appreciated!

These are the two errors logged in the editor:

Failed running C:\Program Files\Unity\Hub\Editor\2018.4.11f1\Editor\Data\il2cpp/build/il2cpp.exe -- convert-to-cpp --emit-null-checks --enable-array-bounds-check --dotnetprofile="unityaot" --compile-cpp --libil2cpp-static --platform="Android" --architecture="ARMv7" --configuration="Release" --outputpath="D:\workflow\Temp\StagingArea\assets\bin\Data\Native\armeabi-v7a\libil2cpp.so" --cachedirectory="D:\workflow\Assets..\Library\il2cpp_android_armeabi-v7a/il2cpp_cache" --additional-include-directories="C:\Program Files\Unity\Hub\Editor\2018.4.11f1\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\bdwgc/include" --additional-include-directories="C:\Program Files\Unity\Hub\Editor\2018.4.11f1\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\libil2cpp/include" --tool-chain-path="C:/Users/seadn/AppData/Local/Android/Ndk/android-ndk-r16b" --map-file-parser="C:\Program Files\Unity\Hub\Editor\2018.4.11f1\Editor\Data\Tools\MapFileParser\MapFileParser.exe" --directory ="D:\workflow\Temp\StagingArea\assets\bin\Data\Managed" --generatedcppdir="D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput"

stdout: Building libil2cpp.so with AndroidToolChain Output directory: D:\workflow\Temp\StagingArea\assets\bin\Data\Native\armeabi-v7a Cache directory: D:\workflow\Library\il2cpp_android_armeabi-v7a\il2cpp_cache ObjectFiles: 678 of which compiled: 0 Total compilation time: 1089 milliseconds. il2cpp.exe didn't catch exception: Unity.IL2CPP.Building.BuilderFailedException: C:\Users\seadn\AppData\Local\Android\Ndk\android-ndk-r16b\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++ @"C:\Users\seadn\AppData\Local\Temp\tmpD234.tmp" -o "D:\workflow\Library\il2cpp_android_armeabi-v7a\il2cpp_cache\linkresult_A2AFE04C1AFC3C78C62C0D968E0224E6\libil2cpp.so" -shared -Wl,-soname,libil2cpp.so -Wl,--no-undefined -Wl,-z,noexecstack -Wl,--gc-sections -Wl,--build-id --sysroot "C:\Users\seadn\AppData\Local\Android\Ndk\android-ndk-r16b\platforms\android-16\arch-arm" -gcc-toolchain "C:\Users\seadn\AppData\Local\Android\Ndk\android-ndk-r16b\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64" -target armv7-none-linux-androideabi -Wl,--wrap,sigaction -L "C:\Users\seadn\AppData\Local\Android\Ndk\android-ndk-r16b\sources\cxx-stl\gnu-libstdc++\4.9\libs\armeabi-v7a" -lgnustl_static -llog -rdynamic -fuse-ld=gold.exe

D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:40930: error: undefined reference to 'Unity_WebRtcNetwork_Create' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41186: error: undefined reference to 'Unity_MediaNetwork_Create' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41375: error: undefined reference to 'Unity_DeviceApi_LastUpdate' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41375: error: undefined reference to 'Unity_DeviceApi_LastUpdate' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41386: error: undefined reference to 'Unity_DeviceApi_Devices_Length' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41386: error: undefined reference to 'Unity_DeviceApi_Devices_Length' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41404: error: undefined reference to 'Unity_DeviceApi_Devices_Get ' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41186: error: undefined reference to 'Unity_MediaNetwork_Create' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41205: error: undefined reference to 'Unity_MediaNetwork_Configure' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41291: error: undefined reference to 'Unity_MediaNetwork_TryGetFrameDataLength' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41280: error: undefined reference to 'Unity_MediaNetwork_TryGetFrame' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41291: error: undefined reference to 'Unity_MediaNetwork_TryGetFrameDataLength' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41280: error: undefined reference to 'Unity_MediaNetwork_TryGetFrame' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41219: error: undefined reference to 'Unity_MediaNetwork_GetConfigurationState' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41219: error: undefined reference to 'Unity_MediaNetwork_GetConfigurationState' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41022: error: undefined reference to 'Unity_WebRtcNetwork_Update' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41219: error: undefined reference to 'Unity_MediaNetwork_GetConfigurationState' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41249: error: undefined reference to 'Unity_MediaNetwork_ResetConfiguration' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41249: error: undefined reference to 'Unity_MediaNetwork_ResetConfiguration' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41302: error: undefined reference to 'Unity_MediaNetwork_SetVolume' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/ Bulk_Assembly-CSharp_0.cpp:41302: error: undefined reference to 'Unity_MediaNetwork_SetVolume' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41312: error: undefined reference to 'Unity_MediaNetwork_HasAudioTrack' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41312: error: undefined reference to 'Unity_MediaNetwork_HasAudioTrack' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41323: error: undefined reference to 'Unity_MediaNetwork_HasVideoTrack' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41323: error: undefined reference to 'Unity_MediaNetwork_HasVideoTrack' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41344: error: undefined reference to 'Unity_MediaNetwork_IsMute' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41344: error: undefined reference to 'Unity_MediaNetwork_IsMute' D:\workflow\Temp\StagingArea\Il 2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41334: error: undefined reference to 'Unity_MediaNetwork_SetMute' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41334: error: undefined reference to 'Unity_MediaNetwork_SetMute' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:40930: error: undefined reference to 'Unity_WebRtcNetwork_Create' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:40945: error: undefined reference to 'Unity_WebRtcNetwork_Release' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:40945: error: undefined reference to 'Unity_WebRtcNetwork_Release' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:40945: error: undefined reference to 'Unity_WebRtcNetwork_Release' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:40978: error: undefined reference to 'Unity_WebRtcNetwork_StartServer' D:\workflow\Temp\StagingArea\ Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:40978: error: undefined reference to 'Unity_WebRtcNetwork_StartServer' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:40992: error: undefined reference to 'Unity_WebRtcNetwork_StopServer' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:40992: error: undefined reference to 'Unity_WebRtcNetwork_StopServer' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:40959: error: undefined reference to 'Unity_WebRtcNetwork_Connect' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:40959: error: undefined reference to 'Unity_WebRtcNetwork_Connect' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41071: error: undefined reference to 'Unity_WebRtcNetwork_PeekEventDataLength' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41110: error: undefined reference to 'Unity_WebRtcNetwork_Dequeue' D:\wor kflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41071: error: undefined reference to 'Unity_WebRtcNetwork_PeekEventDataLength' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41110: error: undefined reference to 'Unity_WebRtcNetwork_Dequeue' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41049: error: undefined reference to 'Unity_WebRtcNetwork_SendData' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41049: error: undefined reference to 'Unity_WebRtcNetwork_SendData' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41060: error: undefined reference to 'Unity_WebRtcNetwork_GetBufferedAmount' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41060: error: undefined reference to 'Unity_WebRtcNetwork_GetBufferedAmount' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41012: error: undefined reference to ' Unity_WebRtcNetwork_Shutdown' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41012: error: undefined reference to 'Unity_WebRtcNetwork_Shutdown' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41022: error: undefined reference to 'Unity_WebRtcNetwork_Update' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41032: error: undefined reference to 'Unity_WebRtcNetwork_Flush' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41032: error: undefined reference to 'Unity_WebRtcNetwork_Flush' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41002: error: undefined reference to 'Unity_WebRtcNetwork_Disconnect' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41002: error: undefined reference to 'Unity_WebRtcNetwork_Disconnect' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:40904: error: undefined reference to 'Unity_WebRtcNetwork_IsAvailable' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:40915: error: undefined reference to 'Unity_WebRtcNetwork_IsBrowserSupported' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41149: error: undefined reference to 'Unity_WebRtcNetwork_Peek' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41160: error: undefined reference to 'Unity_MediaNetwork_IsAvailable' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41171: error: undefined reference to 'Unity_MediaNetwork_HasUserMedia' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41230: error: undefined reference to 'Unity_MediaNetwork_GetConfigurationError' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41355: error: undefined reference to 'Unity_DeviceApi_Update' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41365: error: undefined reference to 'Unity_DeviceApi_RequestUpdate' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41423: error: undefined reference to 'Unity_SLog_SetLogLevel' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41433: error: undefined reference to 'Unity_InitAsync' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41443: error: undefined reference to 'Unity_PollInitState' clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)

at Unity.IL2CPP.Building.CppProgramBuilder.PostprocessObjectFiles(HashSet`1 objectFiles, CppToolChainContext toolChainContext) at Unity.IL2CPP.Building.CppProgramBuilder.Build(IBuildStatistics& statistics) at il2cpp.Program.DoRun(String[] args) at il2cpp.Program.Run(String[] args) at il2cpp.Program.Main(String[] args) stderr:

Unhandled Exception: Unity.IL2CPP.Building.BuilderFailedException: C:\Users\seadn\AppData\Local\Android\Ndk\android-ndk-r16b\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++ @"C:\Users\seadn\AppData\Local\Temp\tmpD234.tmp" -o "D:\workflow\Library\il2cpp_android_armeabi-v7a\il2cpp_cache\linkresult_A2AFE04C1AFC3C78C62C0D968E0224E6\libil2cpp.so" -shared -Wl,-soname,libil2cpp.so -Wl,--no-undefined -Wl,-z,noexecstack -Wl,--gc-sections -Wl,--build-id --sysroot "C:\Users\seadn\AppData\Local\Android\Ndk\android-ndk-r16b\platforms\android-16\arch-arm" -gcc-toolchain "C:\Users\seadn\AppData\Local\Android\Ndk\android-ndk-r16b\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64" -target armv7-none-linux-androideabi -Wl,--wrap,sigaction -L "C:\Users\seadn\AppData\Local\Android\Ndk\android-ndk-r16b\sources\cxx-stl\gnu-libstdc++\4.9\libs\armeabi-v7a" -lgnustl_static -llog -rdynamic -fuse-ld=gold.exe

D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:40930: error: undefined reference to 'Unity_WebRtcNetwork_Create' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41186: error: undefined reference to 'Unity_MediaNetwork_Create' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41375: error: undefined reference to 'Unity_DeviceApi_LastUpdate' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41375: error: undefined reference to 'Unity_DeviceApi_LastUpdate' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41386: error: undefined reference to 'Unity_DeviceApi_Devices_Length' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41386: error: undefined reference to 'Unity_DeviceApi_Devices_Length' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41404: error: undefined reference to 'Unity_DeviceApi_Devices_Get ' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41186: error: undefined reference to 'Unity_MediaNetwork_Create' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41205: error: undefined reference to 'Unity_MediaNetwork_Configure' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41291: error: undefined reference to 'Unity_MediaNetwork_TryGetFrameDataLength' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41280: error: undefined reference to 'Unity_MediaNetwork_TryGetFrame' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41291: error: undefined reference to 'Unity_MediaNetwork_TryGetFrameDataLength' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41280: error: undefined reference to 'Unity_MediaNetwork_TryGetFrame' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41219: error: undefined reference to 'Unity_MediaNetwork_GetConfigurationState' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41219: error: undefined reference to 'Unity_MediaNetwork_GetConfigurationState' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41022: error: undefined reference to 'Unity_WebRtcNetwork_Update' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41219: error: undefined reference to 'Unity_MediaNetwork_GetConfigurationState' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41249: error: undefined reference to 'Unity_MediaNetwork_ResetConfiguration' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41249: error: undefined reference to 'Unity_MediaNetwork_ResetConfiguration' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/Bulk_Assembly-CSharp_0.cpp:41302: error: undefined reference to 'Unity_MediaNetwork_SetVolume' D:\workflow\Temp\StagingArea\Il2Cpp\il2cppOutput/ Bulk_Assembly-CSharp_0.cpp:41302: error: undefined reference to 'Unity_M

and:

Exception: C:\Program Files\Unity\Hub\Editor\2018.4.11f1\Editor\Data\il2cpp/build/il2cpp.exe did not run properly. UnityEditorInternal.Runner.RunProgram (UnityEditor.Utils,Program p. System,String exe. System,String args. System,String workingDirectory. UnityEditor.Scripting.Compilers:CompilerOutputParserBase parser) (at C./buildslave/unity/build/Editor/Mono/BuildPipeline/BuildUtils:cs.130) UnityEditorInternal.Runner.RunManagedProgram (System,String exe. System,String args. System,String workingDirectory. UnityEditor.Scripting.Compilers,CompilerOutputParserBase parser. System.Action 1[T] setupStartInfo) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildUtils.cs:73) UnityEditorInternal.IL2CPPBuilder.RunIl2CppWithArguments (System.Collections.Generic.List 1[T] arguments, System.Action 1[T] setupStartInfo, System.String workingDirectory) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:370) UnityEditorInternal.IL2CPPBuilder.ConvertPlayerDlltoCpp (System.String inputDirectory, System.String outputDirectory, System.String workingDirectory, System.Boolean platformSupportsManagedDebugging) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:351) UnityEditorInternal.IL2CPPBuilder.Run () (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:211) UnityEditorInternal.IL2CPPUtils.RunIl2Cpp (System.String tempFolder, System.String stagingAreaData, UnityEditorInternal.IIl2CppPlatformProvider platformProvider, System.Action 1[T] setupStartInfo, System.String workingDirectory) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:370) UnityEditorInternal.IL2CPPBuilder.ConvertPlayerDlltoCpp (System.String inputDirectory, System.String outputDirectory, System.String workingDirectory, System.Boolean platformSupportsManagedDebugging) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:351) UnityEditorInternal.IL2CPPBuilder.Run () (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:211) UnityEditorInternal.IL2CPPUtils.RunIl2Cpp (System.String tempFolder, System.String stagingAreaData, UnityEditorInternal.IIl2CppPlatformProvider platformProvider, System.Action 1[T] modifyOutputBeforeCompile, UnityEditor.RuntimeClassRegistry runtimeClassRegistry) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:35) UnityEditor.Android.PostProcessor.Tasks.RunIl2Cpp.Execute (UnityEditor.Android.PostProcessor.Pos tProcessorContext context) (at:0) UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context) (at:0) UnityEditor.Android.PostProcessAndroidPlayer.PostProcess (UnityEditor.BuildTarget target, System.String stagingAreaData, System.String stagingArea, System.String playerPackage, System.String installPath, System.String companyName, System.String productName, UnityEditor.BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.Build.Reporting.BuildReport report) (at:0) UnityEditor.Android.AndroidBuildPostprocessor.PostProcess (UnityEditor.Modules.BuildPostProcessArgs args, UnityEditor.BuildProperties& outProperties) (at:0) UnityEditor.PostprocessBuildPlayer.Postprocess (UnityEditor.BuildTargetGroup targetGroup, UnityEditor.BuildTarget target, System.String installPath, System.String com panyName, System.String productName, System.Int32 width, System.Int32 height, UnityEditor.BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.Build.Reporting.BuildReport report) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/PostprocessBuildPlayer.cs:286) UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

Answer 1

The undefined references were referring to a WebRTC plugin in the Unity project which did not support IL2CPP. I updated the plugin to a newer version which supports IL2CPP and successfully built the.aab file.