I have a solution with multiple projects. I have a ‘main’ project, which acts as a menu and from there, the user can access any of the other projects. On this main project, I get linker errors for every function called. How do I avoid these linker errors? I set the project dependencies already in the ‘Project Dependencies…’ dialog.
Thanks
EDIT — I did as suggested and added the output folder to the linker’s additional directories. Now, however, I get a million errors as follows:
3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: void __thiscall std::basic_ios >::setstate(int,bool)' (?setstate@?$basic_ios@DU?$char_traits@D@std@@@std@@QAEXH_N@Z) already defined in panels.lib(panel_main.obj) 3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: int __thiscall std::ios_base::width(int)' (?width@ios_base@std@@QAEHH@Z) already defined in panels.lib(panel_main.obj) 3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: int __thiscall std::basic_streambuf >::sputn(char const *,int)' (?sputn@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QAEHPBDH@Z) already defined in panels.lib(panel_main.obj) 3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: static bool __cdecl std::char_traits::eq_int_type(int const &,int const &)' (?eq_int_type@?$char_traits@D@std@@SA_NABH0@Z) already defined in panels.lib(panel_main.obj) 3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: static int __cdecl std::char_traits::eof(void)' (?eof@?$char_traits@D@std@@SAHXZ) already defined in panels.lib(panel_main.obj) 3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: int __thiscall std::basic_streambuf >::sputc(char)' (?sputc@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QAEHD@Z) already defined in panels.lib(panel_main.obj) 3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: class std::basic_streambuf > * __thiscall std::basic_ios >::rdbuf(void)const ' (?rdbuf@?$basic_ios@DU?$char_traits@D@std@@@std@@QBEPAV?$basic_streambuf@DU?$char_traits@D@std@@@2@XZ) already defined in panels.lib(panel_main.obj) 3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: char __thiscall std::basic_ios >::fill(void)const ' (?fill@?$basic_ios@DU?$char_traits@D@std@@@std@@QBEDXZ) already defined in panels.lib(panel_main.obj) 3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: int __thiscall std::ios_base::flags(void)const ' (?flags@ios_base@std@@QBEHXZ) already defined in panels.lib(panel_main.obj) 3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: int __thiscall std::ios_base::width(void)const ' (?width@ios_base@std@@QBEHXZ) already defined in panels.lib(panel_main.obj) 3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: static unsigned int __cdecl std::char_traits::length(char const *)' (?length@?$char_traits@D@std@@SAIPBD@Z) already defined in panels.lib(panel_main.obj) 3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: class std::basic_ostream > & __thiscall std::basic_ostream >::flush(void)' (?flush@?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEAAV12@XZ) already defined in panels.lib(panel_main.obj) 3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: class std::basic_ostream > * __thiscall std::basic_ios >::tie(void)const ' (?tie@?$basic_ios@DU?$char_traits@D@std@@@std@@QBEPAV?$basic_ostream@DU?$char_traits@D@std@@@2@XZ) already defined in panels.lib(panel_main.obj) 3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: bool __thiscall std::ios_base::good(void)const ' (?good@ios_base@std@@QBE_NXZ) already defined in panels.lib(panel_main.obj) 3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: void __thiscall std::basic_ostream >::_Osfx(void)' (?_Osfx@?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEXXZ) already defined in panels.lib(panel_main.obj) 3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: void __thiscall std::basic_streambuf >::_Lock(void)' (?_Lock@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QAEXXZ) already defined in panels.lib(panel_main.obj) 3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: void __thiscall std::basic_streambuf >::_Unlock(void)' (?_Unlock@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QAEXXZ) already defined in panels.lib(panel_main.obj) 3>msvcprtd.lib(MSVCP90D.dll) : error LNK2005: 'public: class std::locale::facet * __thiscall std::locale::facet::_Decref(void)' (?_Decref@facet@locale@std@@QAEPAV123@XZ) already defined in panels.lib(panel_main.obj) 3>libcpmtd.lib(ios.obj) : error LNK2005: 'private: static void __cdecl std::ios_base::_Ios_base_dtor(class std::ios_base *)' (?_Ios_base_dtor@ios_base@std@@CAXPAV12@@Z) already defined in msvcprtd.lib(MSVCP90D.dll) 3>libcpmtd.lib(ios.obj) : error LNK2005: 'public: static void __cdecl std::ios_base::_Addstd(class std::ios_base *)' (?_Addstd@ios_base@std@@SAXPAV12@@Z) already defined in msvcprtd.lib(MSVCP90D.dll) 3>libcpmtd.lib(locale0.obj) : error LNK2005: 'void __cdecl _AtModuleExit(void (__cdecl*)(void))' (?_AtModuleExit@@YAXP6AXXZ@Z) already defined in msvcprtd.lib(locale0_implib.obj) 3>libcpmtd.lib(locale0.obj) : error LNK2005: __Fac_tidy already defined in msvcprtd.lib(locale0_implib.obj) 3>libcpmtd.lib(locale0.obj) : error LNK2005: 'private: static void __cdecl std::locale::facet::facet_Register(class std::locale::facet *)' (?facet_Register@facet@locale@std@@CAXPAV123@@Z) already defined in msvcprtd.lib(locale0_implib.obj) 3>libcpmtd.lib(locale0.obj) : error LNK2005: 'private: static class std::locale::_Locimp * __cdecl std::locale::_Getgloballocale(void)' (?_Getgloballocale@locale@std@@CAPAV_Locimp@12@XZ) already defined in msvcprtd.lib(MSVCP90D.dll) 3>libcpmtd.lib(locale0.obj) : error LNK2005: 'private: static class std::locale::_Locimp * __cdecl std::locale::_Init(void)' (?_Init@locale@std@@CAPAV_Locimp@12@XZ) already defined in msvcprtd.lib(MSVCP90D.dll) 3>libcpmtd.lib(locale0.obj) : error LNK2005: 'public: static void __cdecl std::_Locinfo::_Locinfo_ctor(class std::_Locinfo *,class std::basic_string,class std::allocator > const &)' (?_Locinfo_ctor@_Locinfo@std@@SAXPAV12@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@2@@Z) already defined in msvcprtd.lib(MSVCP90D.dll) 3>libcpmtd.lib(locale0.obj) : error LNK2005: 'public: static void __cdecl std::_Locinfo::_Locinfo_dtor(class std::_Locinfo *)' (?_Locinfo_dtor@_Locinfo@std@@SAXPAV12@@Z) already defined in msvcprtd.lib(MSVCP90D.dll) 3>libcpmtd.lib(xlock.obj) : error LNK2005: 'public: __thiscall std::_Lockit::_Lockit(int)' (??0_Lockit@std@@QAE@H@Z) already defined in msvcprtd.lib(MSVCP90D.dll) 3>libcpmtd.lib(xlock.obj) : error LNK2005: 'public: __thiscall std::_Lockit::~_Lockit(void)' (??1_Lockit@std@@QAE@XZ) already defined in msvcprtd.lib(MSVCP90D.dll)
Without knowing any other detail about your solution it is hard to tell, however Rebuild All, might be helpful. This situation can sometimes occur when there are mixed object files for different architectures.
You might also want to consider using ‘References’ instead of ‘Dependencies’
EDIT:
After what you have posted it seems that your linkage to standard libraries is inconsistent. Could it be that one of the project links standard libraries statically while others dynamically? (See project properties->linker) Or one to the release runtime, while others to debug? (though the last one should be possible, with caveats)