linux gcc编译字节对齐设置方法
admin发表于 2013-01-25 09:40:00
使用#pragma pack(n)
- 伪指令#pragma pack (n)，编译器将按照n 个字节对齐
- 伪指令#pragma pack ()，取消自定义字节对齐方式
#pragma pack(1)
struct my_align_struct {
uint32 u0:8;
uint32 u1:8;
uint32 u2:8;
uint32 u3:16;
};
#pragma pack()
sizeof(my_align_struct) == 5 // 默认情况下gcc是按照四字节对齐的，sizeof(my_align_struct) == 8.
使用__attribute__属性
struct my_align_struct {
uint32 u0:8;
uint32 u1:8;
uint32 u2:8;
uint32 u3:16;
}__attribute__((packed, aligned(1)));