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Solve error LNK2005: _DllMain@12 already defined in msvcrtd.lib(dllmain.obj) in MFC Projects

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5 Mar 2012CPOL 52.5K   1   3

Introduction



Sometimes A LNK2005 error occurs when the CRT library and MFC libraries are linked in the wrong order in Visual C++. As a result you would see the error described in the subject line.



How to Solve



Declare the mfc80ud.lib and mfcs80ud.lib in the Additional Dependancies field in the Linker Tab of Visual Studio and this problem should be resolved. 



 
Here 80 corresponds to the version of MS Visual Studio and 'd' states that it is debug dll.
 
For example,



msvcr90d.dll = VS 2008 debug xxxx.dl,
msvcr80d.dll = VS 2005 debug xxxx.dl,
msvcr71d.dll = VS 2003 debug xxxx.dl,
msvcr70d.dll = VS 2002 debug xxxx.dl, 
 
For Release dlls of-course you will not have 'd' suffix at the end of your dll name.



Thanks to Lakamraju Raghuram for the clarifications.



Points of Interest



I faced this problem while compiling a DLL, so probably the solution is applicable for dlls only.



History



Tip uploaded : 4th March, 2012.



Tip updated  : 5th March, 2012 

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


Written By
Technical Lead Kotha Technologies
Bangladesh Bangladesh
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Comments and Discussions

 
QuestionCheck if you have both _USRDLL and _AFXDLL defined Pin
Dan Konigsbach17-Jul-13 14:48
Dan Konigsbach17-Jul-13 14:48 
QuestionVisual Studio 2010 Pin
jpat3472110-Feb-13 17:22
jpat3472110-Feb-13 17:22 
for visual studio 2010 the offending lib to be added to the dependency list is mfcs100u.lib
AnswerRe: Visual Studio 2010 Pin
Mukit, Ataul11-Feb-13 0:17
Mukit, Ataul11-Feb-13 0:17 

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