在不同配置之间共享.obj文件

My goal is to integrate testing into my development environment (as post-build step). I don't want to interfere with the DLLs that are generated in debug and release, so i plan to create new configurations for the project. But i don't want to compile every source file i have twice - once for the DLL, once for the test unit - I want to share the generated object files. How can I achieve this ?My goal is to integrate testing into my develop