[lwip-devel] about the keyword __packed

[jack W]

   in the porting the lwip into ucos-ii  i have some questions about them . in 
the definition of struct .we need the macros #define PACK_STRUCT_FIELD(x) .and  
in the macros definition: #define PACK_STRUCT_FIELD(x)  , it need the keyword 
__packed, this keyword is defined in the C compiler ,and my C compiler is 
ansi/iso standard c ,
but i can't find the __packed keyword in my C compiler.