How to identify platform/compiler from preprocessor macros?

I'm writing a cross-platform code, which should compile at linux, windows, Mac OS. On windows, I must support visual studio and mingw.

There are some pieces of platform-specific code, which I should place in #ifdef .. #endif environment. For example, here I placed win32 specific code:

#ifdef WIN32
#include <windows.h>
#endif

But how do I recognize linux and mac OS? What are defines names (or etc.) I should use?

Solution 1:

For Mac OS:

#ifdef __APPLE__

For MingW on Windows:

#ifdef __MINGW32__

For Linux:

#ifdef __linux__

For other Windows compilers, check this thread and this for several other compilers and architectures.

Solution 2:

See: http://predef.sourceforge.net/index.php

This project provides a reasonably comprehensive listing of pre-defined #defines for many operating systems, compilers, language and platform standards, and standard libraries.