Header file that detects and defines what platform you are compiling for

platform.h

#pragma once

#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__NT__)
	#define PLATFORM_WINDOWS 1
	#define PLATFORM_NT 1
	#ifdef _WIN64
		#define PLATFORM_WINDOWS64 1
		#define PLATFORM_64 1
	#else
		#define PLATFORM_WINDOWS32 1
		#define PLATFORM_32 1
	#endif
#elif defined(__APPLE__)
	#include <TargetConditionals.h>
	#if TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR
		#define PLATFORM_IOS 1
	#elif TARGET_OS_MAC
		#define PLATFORM_MACOS 1
	#endif
	#define PLATFORM_APPLE 1
	#define PLATFORM_NIX 1
#elif defined(__linux__)
	#define PLATFORM_LINUX 1
	#define PLATFORM_NIX 1
#elif defined(__unix__) || defined(_POSIX_VERSION)
	#define PLATFORM_NIX 1
#else
	#define PLATFORM_UNKNOWN 1
#endif

#ifndef PLATFORM_WINDOWS
	#if defined(__x86_64__) || defined(__aarch64__) || defined(__powerpc64__) || UINTPTR_MAX == 0xffffffffffffffff
		#define PLATFORM_64 1
	#elif defined(__i386__) || defined(__arm__) || UINTPTR_MAX == 0xffffffff
		#define PLATFORM_32 1
	#else
		#define PLATFORM_UNKNOWNBITS 1
	#endif
#endif

#if PLATFORM_WINDOWS64
	#define PLATFORM_ARCH_WIN64 1
#elif PLATFORM_WINDOWS32
	#define PLATFORM_ARCH_WIN32 1
#elif PLATFORM_64
	#if defined(__x86_64__)
		#define PLATFORM_ARCH_x86_64 1
	#elif defined(__aarch64__)
		#define PLATFORM_ARCH_AARCH64 1
	#elif defined(__powerpc64__)
		#define PLATFORM_ARCH_POWERPC64 1
	#else
		#define PLATFORM_ARCH_64 1
	#endif
#elif PLATFORM_32
	#if defined(__i386__)
		#define PLATFORM_ARCH_I386 1
	#elif defined(__arm_)
		#define PLATFORM_ARCH_ARM 1
	#else
		#define PLATFORM_ARCH_32 1
	#endif
#else
	#define PLATFORM_ARCH_UNKNOWN 1
#endif

#if PLATFORM_WINDOWS
	#define PLATFORM_STR_OS "Windows"
#elif PLATFORM_MACOS
	#define PLATFORM_STR_OS "macOS"
#elif PLATFORM_IOS
	#define PLATFORM_STR_OS "iOS"
#elif PLATFORM_APPLE
	#define PLATFORM_STR_OS "Apple"
#elif PLATFORM_LINUX
	#define PLATFORM_STR_OS "Linux"
#elif PLATFORM_NIX
	#define PLATFORM_STR_OS "UNIX-like"
#else
	#define PLATFORM_STR_OS "Unknown"
#endif

#if PLATFORM_ARCH_WIN64
	#define PLATFORM_STR_ARCH "Win64"
#elif PLATFORM_ARCH_WIN32
	#define PLATFORM_STR_ARCH "Win32"
#elif PLATFORM_ARCH_x86_64
	#define PLATFORM_STR_ARCH "x86_64"
#elif PLATFORM_ARCH_AARCH64
	#define PLATFORM_STR_ARCH "aarch64"
#elif PLATFORM_ARCH_POWERPC64
	#define PLATFORM_STR_ARCH "powerpc64"
#elif PLATFORM_ARCH_64
	#define PLATFORM_STR_ARCH "64-bit (Unknown)"
#elif PLATFORM_ARCH_I386
	#define PLATFORM_STR_ARCH "i386"
#elif PLATFORM_ARCH_ARM
	#define PLATFORM_STR_ARCH "arm"
#elif PLATFORM_ARCH_32
	#define PLATFORM_STR_ARCH "32-bit (Unknown)"
#else
	#define PLATFORM_STR_ARCH "Unknown"
#endif

#define PLATFORM_STR (PLATFORM_STR_OS " " PLATFORM_STR_ARCH)