Linker Error Already Defined In Main.obj
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Already defined in .obj - no double inclusions up vote 12 down vote favorite 5 I happened to get that already defined in .obj error. This is structure of my project: main.cpp #include "main.h"; main.h #include
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is http://stackoverflow.com/questions/15421254/already-defined-in-obj-no-double-inclusions a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Already defined in main.obj [closed] up vote 4 down vote favorite 2 This is the code for my problem and i get 4 errors: student.obj : error LNK2005: "struct Node * http://stackoverflow.com/questions/13128719/already-defined-in-main-obj admitedFirstNode" (?admitedFirstNode@@3PAUNode@@A) already defined in main.obj student.obj : error LNK2005: "struct Node * allFirstNode" (?allFirstNode@@3PAUNode@@A) already defined in main.obj student.obj : error LNK2005: "struct Node * rejectedFirstNode" (?rejectedFirstNode@@3PAUNode@@A) already defined in main.obj pb4_OOP_lab1\Debug\pb4_OOP_lab1.exe : fatal error LNK1169: one or more multiply defined symbols found #include "students.h" //main int main() { for(int i=0;i here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us http://stackoverflow.com/questions/12915037/linker-error-already-defined Learn more about Stack Overflow the company Business Learn more about hiring developers http://www.cplusplus.com/forum/beginner/104849/ or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Linker error: already defined up vote 2 linker error down vote favorite I am trying to compile my Visual C++ project (uses MFC) in Microsoft Visual Studio 2012, and it comes back with the following errors: error LNK2005: "void * __cdecl operator new(unsigned int)" (??2@YAPAXI@Z) already defined in LIBCMTD.lib(new.obj) error LNK2005: "void __cdecl operator delete(void *)" (??3@YAXPAX@Z) already defined in LIBCMTD.lib(dbgdel.obj) error LNK2005: "void __cdecl operator delete[](void *)" (??_V@YAXPAX@Z) already defined in LIBCMTD.lib(delete2.obj) error LNK1169: one linker error already or more multiply defined symbols found So I googled around a bit and found this page: http://support.microsoft.com/?scid=kb%3Ben-us%3B148652&x=13&y=8 I tried solution one but the "Ignore Libraries" box does not exist, and so does the Object/library modules box. For the Ignore Libraries I found Ignore specific libraries, but skipping step five only gave me 17xx errors. I googled around a lot, but always came back to the same page, how can I fix this problem in Visual Studio 2012? c++ mfc linker visual-studio-2012 share|improve this question asked Oct 16 '12 at 12:44 Cheiron 1,30831036 Are you linking against any non-system libraries, e.g. boost? –snowdude Oct 16 '12 at 15:03 I do not think I am. All im using is Kintect, MFC and Windows. –Cheiron Oct 18 '12 at 8:04 Have you tried changing the Runtime library? e.g. in C/C++->Code Generation using Multi-threaded Debug DLL (/MDd). –snowdude Oct 18 '12 at 9:07 add a comment| 5 Answers 5 active oldest votes up vote 2 down vote The most likely cause of the problem is having different versions of the C runtime (multi- or single-threaded, debug- or non-debug) linked for different parts of the project. Perh main.cpp 1>Server.obj : error LNK2005: "class sf::Packet & __cdecl operator<<(class sf::Packet &,struct NetworkMessage const &)" (??6@YAAAVPacket@sf@@AAV01@ABUNetworkMessage@@@Z) already defined in main.obj 1>Server.obj : error LNK2005: "class sf::Packet & __cdecl operator>>(class sf::Packet &,struct NetworkMessage &)" (??5@YAAAVPacket@sf@@AAV01@AAUNetworkMessage@@@Z) already defined in main.obj 1>C:\Users\David\Documents\Visual Studio 2010\Projects\Kirby_Server\Debug\Kirby_Server.exe : fatal error LNK1169: one or more multiply defined symbols found ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== It says that some functions i made have already been defined in main.obj, but they are not. They are defined in "NetworkMessage.h". I did some researching and found that a common inducement of this error is including a .cpp when a .h was intended. I have already made sure that all of my includes are .h. All of my files begin with #pragma once . If there is anything i should show you to help you help me just let me know. Here is code i think is relevant: main.cpp includes 1
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#include
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#include "NetworkMessage.h" #include "ClientStruct.h" ClientStruct.h includes #include "Defines.h" Defines.h includes 1
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#pragma once #include "ClientStruct.h" struct NetworkMessage { Message_Type messageType; int integer_Message; std::string string_Message; ClientStruct clientUpdate_Message; }; //send sf::Packet& operator <<(sf::Packet&packet, const NetworkMessage& data) { switch