error LNK2005: xxx already defined in MSVCRT.lib(MSVCR100.dll) C:\something\LIBCMT.lib(setlocal.obj)

You are mixing code that was compiled with /MD (use DLL version of CRT) with code that was compiled with /MT (use static CRT library). That cannot work, all source code files must be compiled with the same setting. Given that you use libraries that were pre-compiled with /MD, almost always the correct setting, you must compile your own code with this setting as well.

Project + Properties, C/C++, Code Generation, Runtime Library.

Beware that these libraries were probably compiled with an earlier version of the CRT, msvcr100.dll is quite new. Not sure if that will cause trouble, you may have to prevent the linker from generating a manifest. You must also make sure to deploy the DLLs you need to the target machine, including msvcr100.dll

Getting this error, I changed the

c/C++ > Code Generation > Runtime Library to Multi-threaded library (DLL) /MD

for both code project and associated Google Test project. This solved the issue.

Note: all components of the project must have the same definition inc/C++ > Code Generation > Runtime Library.Either DLL or not DLL, but identical.

Some readers will have another issue and need this fix. read the links below. the same problem occured with visual studio 2015 with the advent of windows sdk 10 which brings up libucrt. ucrt is the windows implementation of C Runtime (CRT) aka the posix runtime library. You most likely have code that was ported from unix... Welcome to the drawback

https://support.microsoft.com/en-us/help/148652/a-lnk2005-error-occurs-when-the-crt-library-and-mfc-libraries-are-linked-in-the-wrong-order-in-visual-c

https://github.com/lordmulder/libsndfile-MSVC/blob/master/src/sf_unistd.h

https://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00224.html

https://msdn.microsoft.com/en-us/library/y23kc048.aspx

https://blogs.msdn.microsoft.com/vcblog/2015/03/03/introducing-the-universal-crt/