Hi,tinyos-help,
I just test gcc/nesc attribute, "__attribute__ ((packed))" .
When I compile the following struct in PC platform, the struct is not one byte
alligned. sizeof(struct foo) is 16.
typedef struct foo{
uint8_t a;
uint64_t b;
};
while in the case of
typedef struct foo{
uint8_t a;
uint64_t b;
}__attribute__ ((packed));
sizeof(struct foo) is 9.
This is easy to understand.
But when I compile the same struct to a mica or micaz flatform. sizeof(struct
foo) is always 9 regardless __attribute__ ((packed)) is used or not.
Why? Is NesC deal all the structs defination in tinyos as packed format?
Best regards,
Shang
2007-08-21
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