c++ - Compiling and Using JSONCPP on Visual Studio10 with Boost

Question

I have recently compiled the SVN version of JSONCPP using the VS71 makefiles. It worked, but I get a lot of linker errors

1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: __int64 __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::sputn(char const *,__int64)" (?sputn@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QAE_JPBD_J@Z) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: void __thiscall std::basic_ostream<char,struct std::char_traits<char> >::_Osfx(void)" (?_Osfx@?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEXXZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: class std::basic_ostream<char,struct std::char_traits<char> > * __thiscall std::basic_ios<char,struct std::char_traits<char> >::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 JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: void __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::_Init(void)" (?_Init@?$basic_streambuf@DU?$char_traits@D@std@@@std@@IAEXXZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::basic_streambuf<char,struct std::char_traits<char> >(void)" (??0?$basic_streambuf@DU?$char_traits@D@std@@@std@@IAE@XZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: __thiscall std::basic_ostream<char,struct std::char_traits<char> >::basic_ostream<char,struct std::char_traits<char> >(class std::basic_streambuf<char,struct std::char_traits<char> > *,bool)" (??0?$basic_ostream@DU?$char_traits@D@std@@@std@@QAE@PAV?$basic_streambuf@DU?$char_traits@D@std@@@1@_N@Z) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: __thiscall std::basic_ios<char,struct std::char_traits<char> >::basic_ios<char,struct std::char_traits<char> >(void)" (??0?$basic_ios@DU?$char_traits@D@std@@@std@@IAE@XZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: char __thiscall std::basic_ios<char,struct std::char_traits<char> >::fill(void)const " (?fill@?$basic_ios@DU?$char_traits@D@std@@@std@@QBEDXZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: char * __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::_Pninc(void)" (?_Pninc@?$basic_streambuf@DU?$char_traits@D@std@@@std@@IAEPADXZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: void __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::setp(char *,char *,char *)" (?setp@?$basic_streambuf@DU?$char_traits@D@std@@@std@@IAEXPAD00@Z) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: void __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::setp(char *,char *)" (?setp@?$basic_streambuf@DU?$char_traits@D@std@@@std@@IAEXPAD0@Z) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: void __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::pbump(int)" (?pbump@?$basic_streambuf@DU?$char_traits@D@std@@@std@@IAEXH@Z) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: char * __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::_Gninc(void)" (?_Gninc@?$basic_streambuf@DU?$char_traits@D@std@@@std@@IAEPADXZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: char * __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::epptr(void)const " (?epptr@?$basic_streambuf@DU?$char_traits@D@std@@@std@@IBEPADXZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: void __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::setg(char *,char *,char *)" (?setg@?$basic_streambuf@DU?$char_traits@D@std@@@std@@IAEXPAD00@Z) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: void __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::gbump(int)" (?gbump@?$basic_streambuf@DU?$char_traits@D@std@@@std@@IAEXH@Z) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: char * __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::egptr(void)const " (?egptr@?$basic_streambuf@DU?$char_traits@D@std@@@std@@IBEPADXZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: char * __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::pptr(void)const " (?pptr@?$basic_streambuf@DU?$char_traits@D@std@@@std@@IBEPADXZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: char * __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::pbase(void)const " (?pbase@?$basic_streambuf@DU?$char_traits@D@std@@@std@@IBEPADXZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: char * __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::gptr(void)const " (?gptr@?$basic_streambuf@DU?$char_traits@D@std@@@std@@IBEPADXZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: char * __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::eback(void)const " (?eback@?$basic_streambuf@DU?$char_traits@D@std@@@std@@IBEPADXZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: int __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::sputc(char)" (?sputc@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QAEHD@Z) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: class std::basic_ostream<char,struct std::char_traits<char> > & __thiscall std::basic_ostream<char,struct std::char_traits<char> >::flush(void)" (?flush@?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEAAV12@XZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: class std::basic_ostream<char,struct std::char_traits<char> > & __thiscall std::basic_ostream<char,struct std::char_traits<char> >::operator<<(int)" (??6?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEAAV01@H@Z) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: virtual __thiscall std::basic_ostream<char,struct std::char_traits<char> >::~basic_ostream<char,struct std::char_traits<char> >(void)" (??1?$basic_ostream@DU?$char_traits@D@std@@@std@@UAE@XZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: class std::basic_streambuf<char,struct std::char_traits<char> > * __thiscall std::basic_ios<char,struct std::char_traits<char> >::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 JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: void __thiscall std::basic_ios<char,struct std::char_traits<char> >::setstate(int,bool)" (?setstate@?$basic_ios@DU?$char_traits@D@std@@@std@@QAEXH_N@Z) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: virtual __thiscall std::basic_ios<char,struct std::char_traits<char> >::~basic_ios<char,struct std::char_traits<char> >(void)" (??1?$basic_ios@DU?$char_traits@D@std@@@std@@UAE@XZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: virtual void __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::imbue(class std::locale const &)" (?imbue@?$basic_streambuf@DU?$char_traits@D@std@@@std@@MAEXABVlocale@2@@Z) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: virtual int __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::sync(void)" (?sync@?$basic_streambuf@DU?$char_traits@D@std@@@std@@MAEHXZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: virtual class std::basic_streambuf<char,struct std::char_traits<char> > * __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::setbuf(char *,__int64)" (?setbuf@?$basic_streambuf@DU?$char_traits@D@std@@@std@@MAEPAV12@PAD_J@Z) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: virtual __int64 __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::xsputn(char const *,__int64)" (?xsputn@?$basic_streambuf@DU?$char_traits@D@std@@@std@@MAE_JPBD_J@Z) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: virtual __int64 __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::xsgetn(char *,__int64)" (?xsgetn@?$basic_streambuf@DU?$char_traits@D@std@@@std@@MAE_JPAD_J@Z) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: virtual int __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::uflow(void)" (?uflow@?$basic_streambuf@DU?$char_traits@D@std@@@std@@MAEHXZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "protected: virtual __int64 __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::showmanyc(void)" (?showmanyc@?$basic_streambuf@DU?$char_traits@D@std@@@std@@MAE_JXZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: virtual void __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::_Unlock(void)" (?_Unlock@?$basic_streambuf@DU?$char_traits@D@std@@@std@@UAEXXZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: virtual void __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::_Lock(void)" (?_Lock@?$basic_streambuf@DU?$char_traits@D@std@@@std@@UAEXXZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: virtual __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::~basic_streambuf<char,struct std::char_traits<char> >(void)" (??1?$basic_streambuf@DU?$char_traits@D@std@@@std@@UAE@XZ) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: __int64 __thiscall std::ios_base::width(__int64)" (?width@ios_base@std@@QAE_J_J@Z) already defined in JSONCPP.lib(json_writer.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: __int64 __thiscall std::ios_base::width(void)const " (?width@ios_base@std@@QBE_JXZ) already defined in JSONCPP.lib(json_writer.obj)
1>

Answer 1

All of the errors are indicative of wrong C runtime settings with your builds. Make sure that all of your object files, libraries, etc are compiled with the same runtime setting, that is:

• Multithreaded (/MT)
• Multithreaded DLL (/MD)
• Multithreaded Debug (/MTd)
• Multithreaded Debug DLL (/MDd)

If this setting isn't the same for all the projects, you've violated the one definition rule (because each C runtime defines things differently) which would result in the behavior you're seeing.

My guess is that the JSONCPP library is being built assuming the static version of the standard library (/MT), while your code is using the Visual Studio default, which is the dynamically linked version (/MD).

You can change this setting from within Visual Studio by selecting the project properties for your project, going to C/C++ -> Code Generation, and changing the Runtime dropdown box.