使用IL2CPP构建Unity项目时出现链接器致命错误求助

问题核心 #

你的项目在IL2CPP构建时，Unity CIL链接器无法解析Mono.Posix程序集——原因是System.Windows.Forms.dll中的XplatUIX11.SetDisplay(IntPtr)方法依赖该程序集，但IL2CPP构建环境默认不包含这个类库，且该类库仅在Mono运行时生效。

解决方案 #

方案1：移除不必要的System.Windows.Forms引用 #

• 检查项目代码或第三方插件，确认是否真的需要System.Windows.Forms。如果是误引入或仅用于编辑器功能：
  1. 在项目中找到System.Windows.Forms.dll（通常在Assets/Plugins或第三方插件目录）
  2. 选中该DLL，在Inspector面板的Platform Settings中，仅勾选Editor平台，取消所有目标构建平台（如WindowsDesktop）的勾选
  3. 重新尝试IL2CPP构建

方案2：通过link.xml排除System.Windows.Forms的X11相关代码 #

如果必须保留System.Windows.Forms引用，创建或修改项目中的link.xml文件，告诉链接器忽略依赖Mono.Posix的部分：

1. 在Assets目录下创建link.xml文件
2. 添加以下内容：

<linker>
  <assembly fullname="System.Windows.Forms">
    <type fullname="System.Windows.Forms.XplatUIX11" preserve="none" />
  </assembly>
</linker>

3. 保存后重新构建IL2CPP项目

方案3：确认第三方插件兼容性 #

检查项目中的第三方插件（如日志、UI或网络库）是否依赖System.Windows.Forms且未针对IL2CPP做兼容处理。如有，更新插件到最新版本，或替换为IL2CPP兼容的替代插件。

错误日志（原文） #

Building Library\Bee\artifacts\WinPlayerBuildProgram\ManagedStripped failed with output:
H:\unity\2021.3.5f1\Editor\Data\il2cpp\build\deploy\UnityLinker.exe --search-directory=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed --out=Library/Bee/artifacts/WinPlayerBuildProgram/ManagedStripped --include-link-xml=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed\MethodsToPreserve.xml --include-link-xml=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed\TypesInScenes.xml --include-link-xml=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed\SerializedTypes.xml --include-link-xml=H:/unity/projekty/URP TEST/Assets\..\Temp\InputSystemLink.xml --include-link-xml=H:\unity\projekty\URP TEST\Assets\Bhop\PlayFabSDK\link.xml --include-directory=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed --dotnetprofile=unityaot-win32 --dotnetruntime=Il2Cpp --platform=WindowsDesktop --use-editor-options --engine-modules-asset-file=H:/unity/2021.3.5f1/Editor/Data/PlaybackEngines/WindowsStandaloneSupport/modules.asset --editor-data-file=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/EditorToUnityLinkerData.json --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/Assembly-CSharp.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/kcp2k.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/Bayat.Core.Runtime.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/Unity.InputSystem.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/IngameDebugConsole.Runtime.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/UnityEngine.UI.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/Mirror.Authenticators.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/Telepathy.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/where-allocations.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/Mirror.Components.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/Mirror.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/Bayat.Json.Runtime.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/Unity.RenderPipelines.Universal.Runtime.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/Unity.VisualEffectGraph.Runtime.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/Mirror.Examples.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/Unity.TextMeshPro.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/PlayFab.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/Unity.RenderPipelines.Core.Runtime.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/Bayat.SaveSystem.Runtime.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/RuntimePreviewGenerator.Runtime.dll --include-unity-root-assembly=H:/unity/projekty/URP TEST/Temp/StagingArea/Data/Managed/SimpleWebTransport.dll --print-command-line
Fatal error in Unity CIL Linker
Mono.Linker.LinkerFatalErrorException: ILLink: error IL1005: System.Windows.Forms.XplatUIX11.SetDisplay(IntPtr): Error processing method 'System.Windows.Forms.XplatUIX11.SetDisplay(IntPtr)' in assembly 'System.Windows.Forms.dll'
 ---> Mono.Cecil.AssemblyResolutionException: Failed to resolve assembly: 'Mono.Posix, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null'
   at Unity.IL2CPP.Common.MissingMethodStubber.GetTypeModule(TypeReference type, IEnumerable`1 assemblies)
   at Unity.Linker.Steps.AddUnresolvedStubsStep.MarkAssemblyOfType(UnityLinkContext context, TypeReference type)
   at Unity.Linker.Steps.Marking.UnresolvedStubMarking.HandleUnresolvedType(TypeReference reference)
   at Unity.Linker.Steps.UnityMarkStep.HandleUnresolvedType(TypeReference reference)
   at Mono.Linker.Steps.MarkStep.MarkType(TypeReference reference, DependencyInfo reason, IMemberDefinition sourceLocationMember)
   at Mono.Linker.Steps.MarkStep.MarkMethodBody(MethodBody body)
   at Unity.Linker.Steps.UnityMarkStep.MarkMethodBody(MethodBody body)
   at Mono.Linker.Steps.MarkStep.ProcessMethod(MethodDefinition method, DependencyInfo& reason)
   at Unity.Linker.Steps.UnityMarkStep.ProcessMethod(MethodDefinition method, DependencyInfo& reason)
   at Mono.Linker.Steps.MarkStep.ProcessQueue()
   --- End of inner exception stack trace ---
   at Mono.Linker.Steps.MarkStep.ProcessQueue()
   at Mono.Linker.Steps.MarkStep.ProcessPrimaryQueue()
   at Mono.Linker.Steps.MarkStep.Process()
   at Mono.Linker.Steps.MarkStep.Process(LinkContext context)
   at Unity.Linker.Steps.UnityMarkStep.Process(LinkContext context)
   at Unity.Linker.UnityPipeline.ProcessStep(LinkContext context, IStep step)
   at Mono.Linker.Pipeline.Process(LinkContext context)
   at Unity.Linker.UnityDriver.UnityRun(Boolean noProfilerAllowed, ILogger customLogger)
   at Unity.Linker.UnityDriver.RunDriverWithoutErrorHandling(ILogger customLogger, Boolean noProfilerAllowed)
   at Unity.Linker.UnityDriver.RunDriver()
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

内容的提问来源于stack exchange，提问作者Bialy