UE5 不同的编译模式下，module的组织形式

由于最近在琢磨UE5.4这个引擎，在学习过程中，碰到了一些非常有意思的事情，我在尝试把之前写的一些底层库搬到UE里面，比如底层库，网络库等等，我通过建立module，将这些库用源代码的方式整合进了UE5，因为我一直认为整体编译可以更方便的更改编译条件，因此都是用源代码的方式，比如一个atom的库，编译的C#脚本如下：

// Copyright Epic Games, Inc. All Rights Reserved.

using System.IO;
using UnrealBuildTool;

public class atom : ModuleRules
{
	public atom(ReadOnlyTargetRules Target) : base(Target)
	{
		PCHUsage = ModuleRules.PCHUsageMode.UseExplicitOrSharedPCHs;

        PublicIncludePaths.AddRange(
			new string[] {
				// ... add public include paths required here ...
            }
			);
				
		
		PrivateIncludePaths.AddRange(
			new string[] {
				// ... add other private include paths required here ...
			}
			);
			
		
		PublicDependencyModuleNames.AddRange(
			new string[]
			{
				//"Core",
				// ... add other public dependencies that you statically link with here ...
			}
			);
			
		
		PrivateDependencyModuleNames.AddRange(
			new string[]
			{
				 //"CoreUObject",
				 //"Engine",
				// "Slate",
				// "SlateCore",
				// ... add private dependencies that you statically link with here ...	
			}
			);
		
		
		DynamicallyLoadedModuleNames.AddRange(
			new string[]
			{
				// ... add any modules that your module loads dynamically here ...
			}
			);
    }
}

非常的简单，甚至屏蔽了所有依赖。 然后在入口的module引用这个库。其编译脚本如下：

// Copyright Epic Games, Inc. All Rights Reserved.

using System.IO;
using UnrealBuildTool;

public class Portal : ModuleRules
{
	public Portal(ReadOnlyTargetRules Target) : base(Target)
	{
		PCHUsage = ModuleRules.PCHUsageMode.UseExplicitOrSharedPCHs;


        PublicIncludePaths.AddRange(
			new string[] {
				// ... add public include paths required here ...
                "atom/code",
            }
            );
				
		
		PrivateIncludePaths.AddRange(
			new string[] {
				// ... add other private include paths required here ...
			}
			);
			
		
		PublicDependencyModuleNames.AddRange(
			new string[]
			{
				"Core",
				// ... add other public dependencies that you statically link with here ...
				"atom"
			}
			);
			
		
		PrivateDependencyModuleNames.AddRange(
			new string[]
			{
				"CoreUObject",
				"Engine",
				"Slate",
				"SlateCore",
				// ... add private dependencies that you statically link with here ...	
			}
			);
		
		
		DynamicallyLoadedModuleNames.AddRange(
			new string[]
			{
				// ... add any modules that your module loads dynamically here ...
			}
			);

    }
}

然后在public dependcy里面将该库引入。这样，就可以编译了。

但是问题来了，这个方法只适合客户端模式，不适合编辑器模式！因为客户端可以用静态库，而编辑器模式需要的是动态库。编辑器模式下甚至打不开编辑器。告诉我atom的dll不存在。

这个非常的坑，我想了很多办法都没有办法兼容两种模式。

后来，迫不得已，我只能将这个atom库改成静态库，不参与编译。其新的编译脚本如下：

// Copyright Epic Games, Inc. All Rights Reserved.

using System.IO;
using UnrealBuildTool;

public class atom : ModuleRules
{
	public atom(ReadOnlyTargetRules Target) : base(Target)
	{
		//PCHUsage = ModuleRules.PCHUsageMode.UseExplicitOrSharedPCHs;

        Type = ModuleType.External;

        PublicIncludePaths.AddRange(
			new string[] {
				// ... add public include paths required here ...
            }
			);
				
		
		PrivateIncludePaths.AddRange(
			new string[] {
				// ... add other private include paths required here ...
			}
			);
			
		
		PublicDependencyModuleNames.AddRange(
			new string[]
			{
				//"Core",
				// ... add other public dependencies that you statically link with here ...
			}
			);
			
		
		PrivateDependencyModuleNames.AddRange(
			new string[]
			{
				 //"CoreUObject",
				 //"Engine",
				// "Slate",
				// "SlateCore",
				// ... add private dependencies that you statically link with here ...	
			}
			);
		
		
		DynamicallyLoadedModuleNames.AddRange(
			new string[]
			{
				// ... add any modules that your module loads dynamically here ...
			}
			);

        PublicAdditionalLibraries.Add(Path.Combine(ModuleDirectory, "lib", "x64", "atom_Debug.lib"));
    }
}

主要是将module的类型改成External，不参与编译，同时准备好这个库的静态库。

然后入口module的编译脚本如下：

// Copyright Epic Games, Inc. All Rights Reserved.

using System.IO;
using UnrealBuildTool;

public class Portal : ModuleRules
{
	public Portal(ReadOnlyTargetRules Target) : base(Target)
	{
		PCHUsage = ModuleRules.PCHUsageMode.UseExplicitOrSharedPCHs;


        PublicIncludePaths.AddRange(
			new string[] {
				// ... add public include paths required here ...
                "atom/code",
            }
            );
				
		
		PrivateIncludePaths.AddRange(
			new string[] {
				// ... add other private include paths required here ...
			}
			);
			
		
		PublicDependencyModuleNames.AddRange(
			new string[]
			{
				"Core",
				// ... add other public dependencies that you statically link with here ...
				"atom",


			}
			);
			
		
		PrivateDependencyModuleNames.AddRange(
			new string[]
			{
				"CoreUObject",
				"Engine",
				"Slate",
				"SlateCore",
				// ... add private dependencies that you statically link with here ...	
			}
			);
		
		
		DynamicallyLoadedModuleNames.AddRange(
			new string[]
			{
				// ... add any modules that your module loads dynamically here ...
			}
			);

    }
}

这个地方引入了静态库，再编译，就可以再客户端模式和编辑器模式下一同生效。