Tell compilation mode from code?

1. Can a C++ program tell in which mode it was built, i.e. debug or release?

Code:

---

#if BUILD_MODE == DEBUG
#endif

---

2. Can I access the compile macros, e.g. $(ConfigurationName), from the code?

#ifdef _DEBUG
// Program is compiled in debug mode
#endif

Open Project Properties, C++, Precompiler, Preprocessor definitions. Here you can see all precompiler constants defined in the project. _DEBUG is defined in Debug configuration and not defined in Release configuration. You can add your own constants here and work with them in the code.
$(ConfigurationName) is macro for build tools, it is not available in the code.

Thanks!