[UE4]编译时的各个平台定义宏

在这里

\Engine\Source\Runtime\Core\Public\HAL\Platform.h

1. // define all other platforms to be zero  

2. //@port Define the platform here to be zero when compiling for other platforms  
   #if !defined(PLATFORM_WINDOWS)  
       #define PLATFORM_WINDOWS 0  
   #endif  
   #if !defined(PLATFORM_XBOXONE)  
       #define PLATFORM_XBOXONE 0  
   #endif  
   #if !defined(PLATFORM_MAC)  
       #define PLATFORM_MAC 0  
   #endif  
   #if !defined(PLATFORM_PS4)  
       #define PLATFORM_PS4 0  
   #endif  
   #if !defined(PLATFORM_IOS)  
       #define PLATFORM_IOS 0  
   #endif  
   #if !defined(PLATFORM_ANDROID)  
       #define PLATFORM_ANDROID 0  
   #endif  
   #if !defined(PLATFORM_ANDROID_ARM)  
       #define PLATFORM_ANDROID_ARM 0  
   #endif  
   #if !defined(PLATFORM_ANDROID_ARM64)  
       #define PLATFORM_ANDROID_ARM64 0  
   #endif  
   #if !defined(PLATFORM_ANDROID_X86)  
       #define PLATFORM_ANDROID_X86 0  
   #endif  
   #if !defined(PLATFORM_ANDROID_X64)  
       #define PLATFORM_ANDROID_X64 0  
   #endif  
   #if !defined(PLATFORM_ANDROIDGL4)  
       #define PLATFORM_ANDROIDGL4 0  
   #endif  
   #if !defined(PLATFORM_ANDROIDES31)  
       #define PLATFORM_ANDROIDES31 0  
   #endif  
   #if !defined(PLATFORM_WINRT)  
       #define PLATFORM_WINRT 0  
   #endif  
   #if !defined(PLATFORM_WINRT_ARM)  
       #define PLATFORM_WINRT_ARM  0  
   #endif  
   #if !defined(PLATFORM_APPLE)  
       #define PLATFORM_APPLE 0  
   #endif  
   #if !defined(PLATFORM_HTML5)  
       #define PLATFORM_HTML5 0  
   #endif  
   #if !defined(PLATFORM_LINUX)  
       #define PLATFORM_LINUX 0  
   #endif