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Linker Error =(

Started by goonst Aug 9, 2005 at 8:53 AM 6 replies 8.3k views

Original Post

Aug 9, 2005 at 8:53 AM

Sorry if this ends up being a really dumb question, but I'm having a tuff time trying to figure this error out. Below are the two errors I get when I try to compile. Linking... LIBCD.lib(crt0.obj) : error LNK2019: unresolved external symbol _main referenced in function _mainCRTStartup Debug/Poker.exe : fatal error LNK1120: 1 unresolved externals My program compiled just fine, but once I added the following line #include It started doing this. This was the only change to my code. Any help would be much appreciated. -- Goonst

SiCrane

Aug 9, 2005 at 8:55 AM

It sounds like you didn't add the SDLmain.lib file to the list of libararies to be linked.

goonst

Aug 9, 2005 at 9:04 AM

I threw SDLmain.lib in C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\lib.

Not sure if the correct way I should be adding this lib though.

SiCrane

Aug 9, 2005 at 9:07 AM

It's not. Go to your project properties, linker setting and hit the input section. Add SDLmain.lib and SDL.lib to the Additional Dependencies line.

goonst

Aug 9, 2005 at 9:15 AM

Even more linker errors unfortunately =(

Linking...
msvcrt.lib(ti_inst.obj) : error LNK2005: "private: __thiscall type_info::type_info(class type_info const &)" (??0type_info@@AAE@ABV0@@Z) already defined in LIBCD.lib(typinfo.obj)
msvcrt.lib(ti_inst.obj) : error LNK2005: "private: class type_info & __thiscall type_info::operator=(class type_info const &)" (??4type_info@@AAEAAV0@ABV0@@Z) already defined in LIBCD.lib(typinfo.obj)
msvcrt.lib(MSVCR71.dll) : error LNK2005: _exit already defined in LIBCD.lib(crt0dat.obj)
msvcrt.lib(MSVCR71.dll) : error LNK2005: _strncpy already defined in LIBCD.lib(strncpy.obj)
msvcrt.lib(MSVCR71.dll) : error LNK2005: _strrchr already defined in LIBCD.lib(strrchr.obj)
msvcrt.lib(MSVCR71.dll) : error LNK2005: _fgetc already defined in LIBCD.lib(fgetc.obj)
msvcrt.lib(MSVCR71.dll) : error LNK2005: _fclose already defined in LIBCD.lib(fclose.obj)
msvcrt.lib(MSVCR71.dll) : error LNK2005: _setvbuf already defined in LIBCD.lib(setvbuf.obj)
msvcrt.lib(MSVCR71.dll) : error LNK2005: __isctype already defined in LIBCD.lib(isctype.obj)
LIBCD.lib(crt0init.obj) : warning LNK4098: defaultlib 'msvcrt.lib' conflicts with use of other libs; use /NODEFAULTLIB:library
SDLmain.lib(SDL_win32_main.obj) : error LNK2019: unresolved external symbol _SDL_main referenced in function _main
Debug/Poker.exe : fatal error LNK1120: 1 unresolved externals

Any ideas? I think I may have added setup SDL incorrectly. I threw all the SDL header files in C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include and all the lib files in C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\lib

Spudder

Aug 9, 2005 at 9:16 AM

SDL defines main() as "int main(int argc, char *argv[])" so make sure your main method matches this otherwise the linker will complain.

Regarding the multiple definition errors, make sure you have your code generation options set to multi-threaded DLL for release build and multi-threaded debug dll for debug builds.

SiCrane

Aug 9, 2005 at 9:19 AM

You need to change your project properties to match the SDL library runtime, it's Properties | C/C++ | Code Generation | Runtime Library. I believe you want to set it to Multithreaded DLL.

goonst

Aug 9, 2005 at 12:45 PM

Sorry for the late reply, That fixed it =). Thank you VERY much for the help guys.

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