Google Test Framework and Visual Studio 2010

Here is a few issues people get when they start using Google Test Framework with Visual Studio:

1. When an empty project is created with the default configuration in Visual Studio and you link it with gtest.lib, you get a lot of link errors like the following:

1>msvcprtd.lib(MSVCP100D.dll) : error LNK2005: “public: virtual __thiscall std::basic_iostream<char,struct std::char_traits<char> >::~basic_iostream<char,struct std::char_traits<char> >(void)” (??1?$basic_iostream@DU?$char_traits@D@std@@@std@@UAE@XZ) already defined in gtest.lib(gtest-all.obj)
1>msvcprtd.lib(MSVCP100D.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 gtest.lib(gtest-all.obj)
1>msvcprtd.lib(MSVCP100D.dll) : error LNK2005: “public: __thiscall std::basic_iostream<char,struct std::char_traits<char> >::basic_iostream<char,struct std::char_traits<char> >(class std::basic_streambuf<char,struct std::char_traits<char> > *)” (??0?$basic_iostream@DU?$char_traits@D@std@@@std@@QAE@PAV?$basic_streambuf@DU?$char_traits@D@std@@@1@@Z) already defined in gtest.lib(gtest-all.obj)

This happens because the default compiler switch of gtest is /MTd and your empty project has /MDd. You need to make them consistent. One option is to change your test project and the tested project to /MTd.

2. You get the following errors when you mix your Release with gtest Debug and vice verse:

gtest.lib(gtest-all.obj) : error LNK2038: mismatch detected for ‘_ITERATOR_DEBUG_LEVEL’: value ‘0’ doesn’t match value ‘2’ in convex_hull_tests.obj
2>LIBCMT.lib(invarg.obj) : error LNK2005: __initp_misc_invarg already defined in LIBCMTD.lib(invarg.obj)
2>LIBCMT.lib(invarg.obj) : error LNK2005: __call_reportfault already defined in LIBCMTD.lib(invarg.obj)
2>LIBCMT.lib(invarg.obj) : error LNK2005: __set_invalid_parameter_handler already defined in LIBCMTD.lib(invarg.obj)
2>LIBCMT.lib(invarg.obj) : error LNK2005: __get_invalid_parameter_handler already defined in LIBCMTD.lib(invarg.obj)
2>LIBCMT.lib(invarg.obj) : error LNK2005: __invoke_watson already defined in LIBCMTD.lib(invarg.obj)