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How to link external static libraries in debug mode

Hi all,

I have been not able to correctly link my static debug library to link correctly. Everything works fine in the release mode however.

In debug mode I get the following error :

 Error    LNK2038    mismatch detected for '_ITERATOR_DEBUG_LEVEL': value '2' doesn't match value '0' in Engine.h.obj    
 Error    LNK2038    mismatch detected for 'RuntimeLibrary': value 'MDd_DynamicDebug' doesn't match value 'MD_DynamicRelease' in Engine.h.obj    

I have created a Type.External Module to wrap my third party library and placed it in the source folder along with the game and the editor modules of my plugin.

I need this because I want to be able to step through the code of the external library after hitting a breakpoint in order to detect and fix issues.

However, I can't, for the life of me, find a way so that I can step through the code in the external library in debug mode. Any and all help on this will be highly appreciated !

Best, darkZ

Product Version: UE 4.10
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asked Feb 22 '16 at 02:44 AM in C++ Programming

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avatar image darkZ Feb 22 '16 at 04:35 AM

So after playing around with this for the whole day I have had some success by building a release library with debug information and optimizations disabled. But if there's a correct way of linking actual Debug libraries I am still interested in hearing about possible solutions. Thanks !

avatar image CatsNipYummy Oct 05 '18 at 12:01 AM

Can you explain how you got it to work? I'm facing the same issue.

avatar image Begounet Oct 05 '18 at 08:07 AM

Got same issue long time ago. If I remember correctly, you have to rebuild your external library and change a setting in the Visual Studio's project settings. So open your library solution, access the project properties, go to C/C++ > Code Generation and find the line "Runtime Library". Here you have the choice between : - Multi-threaded (/MT) - Multi-threaded Debug (/MTd) - Multi-threaded DLL (/MD) - Multi-threaded Debug DLL (/MDd)

"MDd_DynamicDebug" means "Multi-threaded Debug DLL (/MDd)" is used. "MD_DynamicRelease" means "Multi-threaded DLL (/MD)" is used.

This setting should match the value in your error message. So you should use "Multi-threaded DLL (/MD)" when compiling your library (if I understood correctly).

More informations are provided here : https://stackoverflow.com/questions/28887001/lnk2038-mismatch-detected-for-runtimelibrary-value-mt-staticrelease-doesn#28887127 and here : https://msdn.microsoft.com/fr-fr/library/2kzt1wy3.aspx

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