C problem...se megethos domhs

[Aggelos Economopoulos]

On Sat, 24 Jan 2004 19:30:11 +0200
"John Tsiombikas (Nuclear / the Lab)" <nuclear at siggraph.org> wrote:
> Aggelos Economopoulos wrote:
> > ii) uparxei to option '-fpack-struct' (or something), alla epeidh ta
> perissotera programmata 8eloun apla na einai packed ta structs pou
> grafontai/diabazontai sto disko/diktuo, uparxei to
> > 
> > struct a {
> > 	char c;
> > 	int i;
> > } __attribute__((packed));
> 
> Alla bebea afou to anothen den einai C, kalo tha einai an se
> endiaferei to portability tou kodika (kathos kai to readability) kati
> tetoia na min ta xrisimopoieis.

Gia poio logo to -fpack-struct einai pio portable apo to

/* FIXME: need to check for specific gcc version */
#ifdef _GNUC_
#define attr_packed	__attribute__((packed))
#else
#define attr_packed
#endif	/* _GNUC_ */

?

> Kai genikos anti na kaneis dump ena struct sto disko, einai poly
> kalyteri idea na organoseis kapos ena fileformat. opote to packing ton
> structs kai alla tetoia den einai kan issue.

To "na organoseis kapos ena fileformat" stereitai periexomenou.
Mhpws mporeis na to diatupwseis kalutera?

Aggelos