Baranyai L�szl� <[EMAIL PROTECTED]> wrote:
> Dear "rc",
>
> First of all, thank you for your answer.
You're welcom, but, well, I wish i'd been more help!
> > > written in C and has strange result: the 14 byte structure allocates 16
> > > bytes, the 3 byte structure requires 3 bytes !?
> >
> > Interesting. Is this x86 linux or sparc linux? What compiler?
> >
> PC: 586 (Celeron)
> Compiler: gcc-2.95.2
The reason I'd asked is that for some architectures you MUST
pad structures or suffer a big hit to rebuild the ints and such
byte at a time.
However, after reading the gcc man page 2 or 3 times (not completely!),
I see that there is no option in gcc to turn off structure padding.
> ...
> > forgotten the compiler option to do that. check the man page...
> These options - according to the manual - are (?):
> -mcode-align
> -mno-code-align
> -mstrict-align
> -mno-strict-align
> -mold-align
> Unfortunately the compiler replied:
> cc1: Invalid option '__what_was_selected__'
oops. Those are only for a certain cpu, not the x86 group.
Sorry!
> The manual mention a pragma:
> #pragma align 1
> which is assumed in all programs and its appearance in source
> had no effect.
Again, it turns out thats for a different CPU.
So, I suppose the short answer now is:
Its padding added by the compiler to make things end up aligned
the way it wants, and you cannot turn it off.
(Thats what i get for confusing the options on Sun's compiler with
those in gcc!)
rc
Rusty Carruth Email: [EMAIL PROTECTED] or [EMAIL PROTECTED]
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