LNK2005 Error
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Hi I have a dll application, which was compiling/linking fine and working correctly. I have to add a function to say class B.cpp/B.h which is similar to another function in another class say A.cpp/A.h. So I copied the function from A and made changes and added it to B. When i compiled it, there was a undeclared identifier error on a function. I checked where the function was defined and added #include xyz.h on the top of the B.cpp. When i compiled it now, it gave me lots of LNK2005 error with message "already defined in B.obj". I worked mostly in C#, so have on idea of this linking issue. Most of the google searches ask me to change project settings, which is not solving the problem.
Regards Shajeel
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Its very simple. Project - > settings Go to linker tab. In linker tab project options edit box at end , just add -------> /FORCE:MULTIPLE Press ok. I hope your problem will be solved.
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I am using VS 2002, can you tell me settings for that as i don't have any Project -> settings options here.
Regards Shajeel
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Its very simple. Project - > settings Go to linker tab. In linker tab project options edit box at end , just add -------> /FORCE:MULTIPLE Press ok. I hope your problem will be solved.
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Hello, I have a question in the same regard. Just now I tried what you suggested /FORCE:MULTIPLE since I was getting Linker error saying 'already defined'. Now because the settings are changed I get warnings saying that the 'x identifier already defined in MainFrm.obj; second definition ignored' So should I stick on to these new settings because even I tried all of the following for my identifier consts file #pragma once #ifndef #define #endif But none of the above worked.With your suggestion the errors are transferred to warnings. What exactly this /FORCE:MULTIPLE do? Thanks Prithaa
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Hello, I have a question in the same regard. Just now I tried what you suggested /FORCE:MULTIPLE since I was getting Linker error saying 'already defined'. Now because the settings are changed I get warnings saying that the 'x identifier already defined in MainFrm.obj; second definition ignored' So should I stick on to these new settings because even I tried all of the following for my identifier consts file #pragma once #ifndef #define #endif But none of the above worked.With your suggestion the errors are transferred to warnings. What exactly this /FORCE:MULTIPLE do? Thanks Prithaa
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Force multiple just ignores second definition with same name. It is generally risky for very big projects in VC++. But I never found it that risky.
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Hello, I have a question in the same regard. Just now I tried what you suggested /FORCE:MULTIPLE since I was getting Linker error saying 'already defined'. Now because the settings are changed I get warnings saying that the 'x identifier already defined in MainFrm.obj; second definition ignored' So should I stick on to these new settings because even I tried all of the following for my identifier consts file #pragma once #ifndef #define #endif But none of the above worked.With your suggestion the errors are transferred to warnings. What exactly this /FORCE:MULTIPLE do? Thanks Prithaa
prithaa wrote:
What exactly this /FORCE:MULTIPLE do?
See here.
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Hi I have a dll application, which was compiling/linking fine and working correctly. I have to add a function to say class B.cpp/B.h which is similar to another function in another class say A.cpp/A.h. So I copied the function from A and made changes and added it to B. When i compiled it, there was a undeclared identifier error on a function. I checked where the function was defined and added #include xyz.h on the top of the B.cpp. When i compiled it now, it gave me lots of LNK2005 error with message "already defined in B.obj". I worked mostly in C#, so have on idea of this linking issue. Most of the google searches ask me to change project settings, which is not solving the problem.
Regards Shajeel
/FORCE:MULTIPLE? :wtf: Just adding a function to another class shouldn't give new linker errors, unless you never define the function. Did you copy the function and not change the scope resolution stuff? With namespaces and classes (C++!) there shouldn't ever be multiple definitions. Mark
Mark Salsbery Microsoft MVP - Visual C++ :java:
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/FORCE:MULTIPLE? :wtf: Just adding a function to another class shouldn't give new linker errors, unless you never define the function. Did you copy the function and not change the scope resolution stuff? With namespaces and classes (C++!) there shouldn't ever be multiple definitions. Mark
Mark Salsbery Microsoft MVP - Visual C++ :java:
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Hello, Because of this FORCE:MULTIPLE my linker errors "already defined in another class' have become warnings so is that fine? I had tried using #pragma once #ifndef #define #endif but none of them worked Thanks Prithaa
I'm just suspicious - What is defined twice in two different classes ? Is this really what you want? Hiding it with a linker option may not be the best solution :) Mark
Mark Salsbery Microsoft MVP - Visual C++ :java: