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原项目时UE5.3的，我把它转换成UE5.6，提前删除了系统生成的中间文件，只保留编译必要的文件，使用UE5.6编译项目时，编译失败，Rider编辑器提示如下问题

11>Microsoft.MakeFile.Targets(44,5): Error MSB3073 : 命令“"G:\Unreal Engine\UE_5.6\Engine\Build\BatchFiles\Build.bat" AuraEditor Win64 Development -Project="XXXXXXXXXXX" -WaitMutex -FromMsBuild -architecture=x64”已退出，代码为 6。

对应到出问题的代码：

<Target Name="Build" DependsOnTargets="PrepareForNMakeBuild;ResolveReferences;GetTargetPath;$(PreNMakeBuildTarget)" Returns="$(NMakeManagedOutput)"><VCMessage Code="MSB8005" Type="Warning" Arguments="NMakeBuildCommandLine" Condition="'$(NMakeBuildCommandLine)'==''"/><Exec Command="$(NMakeBuildCommandLine)" Condition="'$(NMakeUseOemCodePage)' == 'true' and '$(NMakeBuildCommandLine)'!=''"/><Exec Command="$(NMakeBuildCommandLine)" UseUtf8Encoding="Always" StdErrEncoding="UTF-8" StdOutEncoding="UTF-8" Condition="'$(NMakeUseOemCodePage)' != 'true' and '$(NMakeBuildCommandLine)'!=''"/></Target>

指向

<Exec Command="$(NMakeBuildCommandLine)" Condition="'$(NMakeUseOemCodePage)' == 'true' and '$(NMakeBuildCommandLine)'!=''"/>

我找了一个UE5.6编译成功的项目和当前项目，对比了一下Target.cs文件：

成功的Target.cs文件

// Copyright Epic Games, Inc. All Rights Reserved.using UnrealBuildTool;
using System.Collections.Generic;public class RPGGameTarget : TargetRules
{public RPGGameTarget(TargetInfo Target) : base(Target){Type = TargetType.Game;DefaultBuildSettings = BuildSettingsVersion.V5;IncludeOrderVersion = EngineIncludeOrderVersion.Unreal5_6;ExtraModuleNames.Add("RPGGame");}
}

失败的Target.cs文件

// Copyright Druid Mechanicsusing UnrealBuildTool;
using System.Collections.Generic;public class AuraTarget : TargetRules
{public AuraTarget(TargetInfo Target) : base(Target){Type = TargetType.Game;DefaultBuildSettings = BuildSettingsVersion.V2;ExtraModuleNames.AddRange( new string[] { "Aura" } );}
}

成功的Editor.Target.cs文件

// Copyright Epic Games, Inc. All Rights Reserved.using UnrealBuildTool;
using System.Collections.Generic;public class RPGGameEditorTarget : TargetRules
{public RPGGameEditorTarget( TargetInfo Target) : base(Target){Type = TargetType.Editor;DefaultBuildSettings = BuildSettingsVersion.V5;IncludeOrderVersion = EngineIncludeOrderVersion.Unreal5_6;ExtraModuleNames.Add("RPGGame");}
}

失败的Editor.Target.cs文件

// Copyright Druid Mechanicsusing UnrealBuildTool;
using System.Collections.Generic;public class AuraEditorTarget : TargetRules
{public AuraEditorTarget(TargetInfo Target) : base(Target){Type = TargetType.Editor;DefaultBuildSettings = BuildSettingsVersion.V2;ExtraModuleNames.AddRange( new string[] { "Aura" } );}
}

看起来新版本字段上有一些变化，所以将失败的cs文件根据新的字段改写一下：

更新后的Target.cs文件

// Copyright Druid Mechanicsusing UnrealBuildTool;
using System.Collections.Generic;public class AuraTarget : TargetRules
{public AuraTarget(TargetInfo Target) : base(Target){Type = TargetType.Game;DefaultBuildSettings = BuildSettingsVersion.V5;IncludeOrderVersion = EngineIncludeOrderVersion.Unreal5_6;ExtraModuleNames.Add("Aura");}
}

更新后的Editor.Target.cs文件

// Copyright Druid Mechanicsusing UnrealBuildTool;
using System.Collections.Generic;public class AuraEditorTarget : TargetRules
{public AuraEditorTarget(TargetInfo Target) : base(Target){Type = TargetType.Editor;DefaultBuildSettings = BuildSettingsVersion.V5;IncludeOrderVersion = EngineIncludeOrderVersion.Unreal5_6;ExtraModuleNames.Add("Aura");}
}

删除不必要的中间文件，再用uproject重新生成sln，再次编译

又提示了新的错误：提示只支持uint8

UENUM(BlueprintType)
enum class EEffectApplicationPolicy
{ApplyOnOverlap,ApplyOnEndOverlap,DoNotApply
};UENUM(BlueprintType)
enum class EEffectRemovalPolicy
{RemoveOnEndOverlap,DoNotRemove
};

修改后

UENUM(BlueprintType)
enum class EEffectApplicationPolicy: uint8
{ApplyOnOverlap,ApplyOnEndOverlap,DoNotApply
};UENUM(BlueprintType)
enum class EEffectRemovalPolicy: uint8
{RemoveOnEndOverlap,DoNotRemove
};

再次编译 又出现新的问题：

11>AuraAbilitySystemLibrary.cpp(465,8): Error C2027 : 使用了未定义类型“FOverlapResult”

参考如下文档：

Gameplay Ability System Course Project - Development Blog

FOverlapResult::FOverlapResult

添加一个头文件：

#include "Engine/OverlapResult.h"

编译成功