On 2019-05-11 22:15 +0800, 郭文峰(Gerald Kwok)wrote: > > At first let me re-format your mail... Please do not use HTML. > > > sorry.Let me explain what I mean. > > > I wanna know what is default structure packing alignment number. There's no such thing. Different types have different alignment, there is no default that applies to all types or all structs.