LWIP非操作系统移植中cc.h文件的疑问

shblh

/* define compiler specific symbols */
#if defined (__ICCARM__)

#define PACK_STRUCT_BEGIN
#define PACK_STRUCT_STRUCT
#define PACK_STRUCT_END
#define PACK_STRUCT_FIELD(x) x
#define PACK_STRUCT_USE_INCLUDES

#elif defined (__CC_ARM)

#define PACK_STRUCT_BEGIN __packed
#define PACK_STRUCT_STRUCT
#define PACK_STRUCT_END
#define PACK_STRUCT_FIELD(x) x

#elif defined (__GNUC__)

#define PACK_STRUCT_BEGIN
#define PACK_STRUCT_STRUCT __attribute__ ((__packed__))
#define PACK_STRUCT_END
#define PACK_STRUCT_FIELD(x) x

#elif defined (__TASKING__)

#define PACK_STRUCT_BEGIN
#define PACK_STRUCT_STRUCT
#define PACK_STRUCT_END
#define PACK_STRUCT_FIELD(x) x

#endif

/*---define (sn)printf formatters for these lwip types, for lwip DEBUG/STATS--*/
各位大神们，#if defined (__ICCARM__)这个是编译器选项，我想问如果是原子大哥的STM32F407开发板，用的开发环境是keil 4，那是哪种编译器选项？

正点原子

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