On Wed, 07 Jul 2004 07:58:14 -0500
Eljay Love-Jensen <eljay@xxxxxxxxx> wrote:
> Try this...
>
> -----------------------------------------------
> #include <stddef.h> /* stddef.h has offsetof macro. */
>
> typedef unsigned short int u16_t;
> typedef unsigned char u8_t;
>
> typedef struct
>
> struct {
> u16_t ff1;
> u16_t ff2;
> u16_t ff3;
> } f1[3];
> u8_t f2;
> u8_t f3;
> u8_t f4;
> u16_t f5;
> } Param_t;
>
> int main()
>
> size_t dist;
>
> dist = offsetof(Param_t, f1[0].ff1);
> printf("f1[0].ff1 is at byte %lu\n", (unsigned long int)dist);
>
> dist = offsetof(Param_t, f1[2].ff2);
> printf("f1[2].ff2 is at byte %lu\n", (unsigned long int)dist);
>
> dist = offsetof(Param_t, f3);
> printf("f3 is at byte %lu\n", (unsigned long int)dist);
>
>
> /* Output, using GCC 3.3.1 on Cygwin / WinNT
> f1[0].ff1 is at byte 0
> f1[2].ff2 is at byte 14
> f3 is at byte 19
> */
I'm using gcc 3.3.2 cross compiler for renesas h8s micros, and it
doesn't work.
Inthe official gcc docs it seems that offsetof (and
__builtin_offsetof) is supported in version 3.5.0.
thanks
--
Massimiliano Cialdi
cialdi@xxxxxxxxxxx
m.cialdi@xxxxxxxx
