[lwip-users] a question about alignment

[jack W]

 hi everyone 


 i am reading the lwip source codes , i happend a question about structure 
alignments .

 in the codes it says : there are four macros #PACK_STRUCT_BEGIN 
#PACK_STRUCT_FIELD
#PACK_STRUCT_STRUCT and #PACK_STRUCT_END  

if i define a structure named  xyz   following :

#PACK_STRUCT_BEGIN
   struct xyz{
    int xxx

}
#PACK_STRUCT_END

IF i should write the "#PACK_STRUCT_FIELD" in the front of variable "int xxx" 
or not ?