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Predefined C/C++ macros for cross-platform development

I do a lot of cross platform development in C/C++, targeting Linux, Windows, macOS, using GCC, MSVC, clang etc.

In order to have cross platform support, it is sometimes needed to add platform dependent or compiler dependent code. I compiled a list of the most important macros I use. This might be helpful for some others as well.

Macro Definition
__linux__ Linux and Linux-derived
__ANDROID__ Android
#if defined(__linux__) && !defined(__ANDROID__) Linux (non-Android)
__APPLE__ Darwin (macOS and iOS)
_WIN32 Windows (32- and 64-bit)
_WIN64 Windows 64-bit
_MSC_VER Visual Studio
__GNUC__ gcc
__clang__ clang
__EMSCRIPTEN__ emscripten
__MINGW32__ MinGW 32, MinGW-w64 32-bit
__MINGW64__ MinGW-w64 64-bit
ARM9 (1) Nintendo DS (ARM9)
_3DS (1) Nintendo 3DS
__SWITCH__ (1) Nintendo Switch

(1) These are defined by the makefiles provided by devkitpro using the -D option, they are not built into the inofficial compilers.

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