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Re: [avr-chat] Strange struct problem


From: Daniel O'Connor
Subject: Re: [avr-chat] Strange struct problem
Date: Fri, 9 Dec 2005 11:11:10 +1030
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On Fri, 9 Dec 2005 10:52, Russell Shaw wrote:
> > Any help gratefully received!
>
> Beware of structure padding leaving holes.
>
> http://www.eskimo.com/~scs/C-faq/q2.12.html
> http://www.eskimo.com/~scs/C-faq/q2.13.html

Hmm, I tried..
    struct foo { 
        uint8_t a;
        uint8_t b;
        uint8_t c;
        uint8_t d;
        uint8_t e;
    } __attribute__ ((packed)) abc = {
        1,
        2,
        3,
        4,
        5
    };

but there is no change in behaviour.

I would not expect GCC to pad [too much] on AVR anyway because the processor 
doesn't require aligned access.

-- 
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C

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