Windows

• WIN32、_WIN32、WIN32、WIN64、_WIN64、WIN64

Android

• ANDROID、__ANDROID__

Linux

• __linux__

iOS/Mac

• __APPLE__、TARGET_OS_IPHONE、TARGET_IPHONE_SIMULATOR、TARGET_OS_MAC

代码判断

#if defined(WIN32) || defined(_WIN32) || defined(_WIN32_) || defined(WIN64) || defined(_WIN64) || defined(_WIN64_)
#define OS_WINDOWS       1
#elif defined(ANDROID) || defined(__ANDROID__)
#define OS_ANDROID       1
#elif defined(__linux__)
#define OS_LINUX	         1
#elif defined(__APPLE__) || defined(TARGET_OS_IPHONE) || defined(TARGET_IPHONE_SIMULATOR) || defined(TARGET_OS_MAC)
#define OS_IOS           1
#else
#define OS_UNKNOWN 1
#endif