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Predefined_Macros.md

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Predefined Macros

This is a list of some useful predefined macros.

A bigger list (that isn't strictly a superset) can be found here: https://sourceforge.net/p/predef/wiki/Home/

To detect Compilers

Macro-Name Compiler Comment
__clang__ Clang + Zig Might not stay predefined in Zig if/when they switch backends
_MSC_VER MSVC
__GNUC__ GCC Sometimes apparently also defined on Clang & Zig, so check for them first
__MINGW32__ MinGW Defined on 32- and 64-bit version, use MINGW64 for detecting 64-bit version only
__TINYC__ TinyC
__POCC__ Pelles C
__DMC__ Digital Mars C
__INTEL_COMPILER Intel
__ICL Intel CL
__EMSCRIPTEN__ Emscripten

To detect C/C++ standard

Macro Standard
__STDC__ C89 or higher
__STDC_VERSION__ == 199901L C99
__STDC_VERSION__ == 201112L C11
__STDC_VERSION__ == 201710L C17
__STDC_VERSION__ == 202311L C23
__cplusplus C++
__cplusplus == 1 pre C++98
__cplusplus == 199711L C++98
__cplusplus == 201103L C++11
__cplusplus == 201402L C++14
__cplusplus == 201703L C++17
__cplusplus == 202002L C++20
__cplusplus == 202302L C++23

To detect OS

Macro Operating System
_WIN32 || __WIN32__ Win32
_WIN64 Win64
__posix POSIX
__unix UNIX
__linux__ Linux
__GNU__ GNU
BSD BSD
__ANDROID__ Android
__MINGW32__ MinGW32
__MINGW64__ MinGW64
__CYGWIN__ Cygwin
__sparc__ || __sparc SPARC
__APPLE__ && __MACH__ MacOS
See example below IOS

Example for IOS / Apple (Source: https://stackoverflow.com/a/5920028/13764271)

#if __APPLE__
    #include <TargetConditionals.h>
    #if TARGET_IPHONE_SIMULATOR
         // iOS, tvOS, or watchOS Simulator
    #elif TARGET_OS_MACCATALYST
         // Mac's Catalyst (ports iOS API into Mac, like UIKit).
    #elif TARGET_OS_IPHONE
        // iOS, tvOS, or watchOS device
    #elif TARGET_OS_MAC
        // Other kinds of Apple platforms
    #else
    	#error "Unknown Apple platform"
    #endif
#endif

To detect Architecture

Macro Architecture
__x86_64 || __x86_64__ x86-64
__amd64__ || _M_AMD64 AMD64
__arm__ || _M_ARM ARM
__aarch64__ ARM64
__i386 || _M_IX86 || _X86_ Intel x86
__mips || __mips__ MIPS

Existence of Architecture Extensions

TBD