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SubjectRe: [PATCH 16/16] fix handling of integer constant expressions
Date
>> Hopefully correct handling of integer constant expressions.  Please, 
>> review.
>
> Heh... The first catches are lovely:
> struct fxsrAlignAssert {
> int _:!(offsetof(struct task_struct,
> thread.i387.fxsave) & 15);
> };

That's... wow?

> #define _IOC_TYPECHECK(t) \
> ((sizeof(t) == sizeof(t[1]) && \
> sizeof(t) < (1 << _IOC_SIZEBITS)) ? \
> sizeof(t) : __invalid_size_argument_for_IOC)
> poisoning _IOW() et.al., so those who do something like
>
> static const char *v4l1_ioctls[] = {
> [_IOC_NR(VIDIOCGCAP)] = "VIDIOCGCAP",
>
> run into trouble.

> The only reason that doesn't break gcc to hell and back is
> that gcc has unfixed bugs in that area.

If I understand correctly what bugs you are talking about,
most (all?) of those were solved in the dark ages already
(i.e., the 3.x series).

> It certainly is not a valid C

Why not? Nothing in the C standard says all your externs
have to be defined in some other translation unit you link
with AFAIK.

> or even a remotely sane one.

It's unusual at least :-)


Segher

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