sparse ignores __attribute__((packed))

sparse ignores __attribute__((packed))

[Bart Van Assche]

Hello,

The test program below compiles fine with gcc 4.5.0 but triggers a
build error with sparse (git repository last updated on July 11). This
seems like a sparse bug to me. Is this a known issue ?

#define BUILD_BUG_ON(e) (void)(sizeof(struct { int:-!!(e); }))

struct s {
    char c;
    int i;
} __attribute__((packed));

int main(int argc, char** argv)
{
    BUILD_BUG_ON(sizeof(struct s) != sizeof(char) + sizeof(int));
    return 0;
}

Bart.
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Re: sparse ignores __attribute__((packed))

[Christopher Li]

On Sun, Aug 15, 2010 at 9:15 AM, Bart Van Assche <bvanassche@acm.org> wrote:
> Hello,
>
> The test program below compiles fine with gcc 4.5.0 but triggers a
> build error with sparse (git repository last updated on July 11). This
> seems like a sparse bug to me. Is this a known issue ?

Yes, it is a known issue. Sparse hasn't pay attention to the packed
attribute at all.

Patches are welcome :-)

Chris