How to identify platform/compiler from preprocessor macros?

2018-06-19 09:11:32

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?

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.

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.

Here's what I use:

#ifdef _WIN32 // note the underscore: without it, it's not msdn official!
    // Windows (x64 and x86)
#elif __unix__ // all unices, not all compilers
    // Unix
#elif __linux__
    // linux
#elif __APPLE__
    // Mac OS, not sure if this is covered by __posix__ and/or __unix__ though...
#endif

EDIT: Although the above might work for the basics, remember to verify what macro you want to check for by looking at the Boost.Predef reference pages. Or just use Boost.Predef directly.

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