Project with external library doesn't link: _ITERATOR_DEBUG_LEVEL and MDd_DynamicDebug errors

Development Programming & Scripting C++
,
1

Hi!

I’m using a external library into my game project. This is the Build.cs file:

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

using UnrealBuildTool;

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

		PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore", "HeadMountedDisplay" });

		PrivateDependencyModuleNames.AddRange(new string[]
		{
			"SQLiteCore",
			"SQLiteSupport"
		});

		// Third party libraries
		string ExternalLibraryDirectory = "G:\\Sources\\Repos\\MyExternalLibraries\\";
		string Platform = (Target.Platform == UnrealTargetPlatform.Win64) ? "x64" : "x86";

		PublicIncludePaths.AddRange(new string[] {
			ExternalLibraryDirectory + "Include"
		});
		PublicAdditionalLibraries.AddRange(new string[] { 
			ExternalLibraryDirectory + Platform + "\\Debug\\MyExternalLibrary.lib"
		});

	}
}

When I try to compile I get this errors:


1> Creating library G:\Sources\MyGameProject\Intermediate\Build\Win64\UnrealEditor\DebugGame\MyGameProject\UnrealEditor-MyGameProject-Win64-DebugGame.lib and object G:\Sources\MyGameProject\Intermediate\Build\Win64\UnrealEditor\DebugGame \MyGameProject\UnrealEditor-MyGameProject-Win64-DebugGame.exp
1>[17/18] Link UnrealEditor-MyGameProject-Win64-DebugGame.dll
1>MyExternalLibrary.lib(MyClassOne.obj) : error LNK2038: differences detected for '_ITERATOR_DEBUG_LEVEL': value '2' does not match value '0' in SharedPCH.Engine.NonOptimized.ShadowErrors.h.obj
1>MyExternalLibrary.lib(MyClassOne.obj) : error LNK2038: differences detected for 'RuntimeLibrary': value 'MDd_DynamicDebug' does not match value 'MD_DynamicRelease' in SharedPCH.Engine.NonOptimized.ShadowErrors.h.obj
1>MyExternalLibrary.lib(MyClassOne.obj) : warning LNK4075: '/EDITANDCONTINUE' is skipped due to '/INCREMENTAL:NO' specification
1>MyExternalLibrary.lib(MyClassTwo.obj) : error LNK2038: differences detected for '_ITERATOR_DEBUG_LEVEL': value '2' does not match value '0' in SharedPCH.Engine.NonOptimized.ShadowErrors.h.obj
1>MyExternalLibrary.lib(MyClassTwo.obj) : error LNK2038: differences detected for 'RuntimeLibrary': value 'MDd_DynamicDebug' does not match value 'MD_DynamicRelease' in SharedPCH.Engine.NonOptimized.ShadowErrors.h.obj
1>MyExternalLibrary.lib(Utils.obj) : error LNK2038: differences detected for '_ITERATOR_DEBUG_LEVEL': value '2' does not match value '0' in SharedPCH.Engine.NonOptimized.ShadowErrors.h.obj
1>MyExternalLibrary.lib(Utils.obj) : error LNK2038: differences detected for 'RuntimeLibrary': value 'MDd_DynamicDebug' does not match value 'MD_DynamicRelease' in SharedPCH.Engine.NonOptimized.ShadowErrors.h.obj
1> Creating library G:\Sources\MyGameProject\Intermediate\Build\Win64\UnrealEditor\DebugGame\MyGameProject\UnrealEditor-MyGameProject-Win64-DebugGame.suppressed.lib and object G:\Sources\MyGameProject\Intermediate\Build\Win64\UnrealEditor \DebugGame\MyGameProject\UnrealEditor-MyGameProject-Win64-DebugGame.suppressed.exp
1>MyExternalLibrary.lib(MyClassOne.obj) : LNK2019 error: unresolved external symbol __imp__invalid_parameter referenced in function "void * __cdecl std::_Allocate_manually_vector_aligned<struct std::_Default_allocate_traits>(unsigned __int64)" (?? $_Allocate_manually_vector_aligned@U_Default_allocate_traits@std@@@std@@YAPEAX_K@Z)
1>MyExternalLibrary.lib(MyClassTwo.obj) : LNK2001 error: unresolved external symbol __imp__invalid_parameter
1>MyExternalLibrary.lib(MyClassOne.obj) : LNK2019 error: unresolved external symbol __imp__CrtDbgReport referenced in function "void * __cdecl std::_Allocate_manually_vector_aligned<struct std::_Default_allocate_traits>(unsigned __int64)" (?? $_Allocate_manually_vector_aligned@U_Default_allocate_traits@std@@@std@@YAPEAX_K@Z)
1>MyExternalLibrary.lib(MyClassTwo.obj) : LNK2001 error: unresolved external symbol __imp__CrtDbgReport
1>G:\Sources\MyGameProject\Binaries\Win64\UnrealEditor-MyGameProject-Win64-DebugGame.dll : fatal error LNK1120: unresolved external 2
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Microsoft\VC\v160\Microsoft.MakeFile.Targets(45,5): error MSB3073: The command ""G:\Program Files \Epic Games\UE_5.0\Engine\Build\BatchFiles\Build.bat" MyGameProjectEditor Win64 DebugGame -Project="G:\Sources\MyGameProject\MyGameProject.uproject" -WaitMutex -FromMsBuild" exited with code 6.
1>Compilation of project "MyGameProject.vcxproj" finished -- ERROR.
========== Compile: 0 correct, 1 incorrect, 0 updated, 1 skipped ==========

I’m compiling it with this configuration:

imagen

And for the external library:

imagen

How can I fix this problem?

2 Likes
2

I have the same problem, did you fix this problem?

3

To statically link your external library, it must be compiled with the same runtime library and debug flags as Unreal Engine does, for the desired target.

If you have access to the lib source code, try to recompile it with /MDd (if you compile UE with DebugGame Editor target). Otherwise your only option is to compile your project with Development Editor target I suppose.