Date: Sat, 6 Sep 2003 02:46:14 -0700 From: Marcel Moolenaar <marcel@xcllnt.net> To: Alexander Leidinger <Alexander@Leidinger.net> Cc: current@freebsd.org Subject: Re: Question about genassym, locore.s and 0-sized arrays(showstopper for an icc compiled kernel) Message-ID: <20030906094614.GA535@athlon.pn.xcllnt.net> In-Reply-To: <20030906105752.7bbed09b.Alexander@Leidinger.net> References: <20030904180448.021a1b6b.Alexander@Leidinger.net> <20030904162858.GI98381@dan.emsphone.com> <20030905001411.3a9030b3.Alexander@Leidinger.net> <20030904225123.GB39916@dan.emsphone.com> <3F584B85.AAC3A11D@mindspring.com> <20030905105507.51ba3183.Alexander@Leidinger.net> <20030905165557.GB566@dhcp01.pn.xcllnt.net> <20030906103334.0f3233aa.Alexander@Leidinger.net> <20030906084259.GP16766@funkthat.com> <20030906105752.7bbed09b.Alexander@Leidinger.net>
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On Sat, Sep 06, 2003 at 10:57:52AM +0200, Alexander Leidinger wrote:
>
> ---snip---
> % <marcel.c
> #include <stdio.h>
>
> struct foo {
> int tag;
> char obj[];
> };
>
> int main(void) {
> struct foo bar;
>
> printf("%d\n", sizeof(struct foo));
> printf("%d\n", sizeof(bar));
>
> return 0;
> }
>
> % ./a.out
> 4
> 4
> ---snip---
The compiler seems to behave correctly WRT C99. However, when
presented with code that uses extensions the compiler behaves
inconsistently or erratically. If the compiler cannot do any-
thing useful with zero-sized arrays, it should reject them
completely. Only then can one reasonably fall back on C99 to
explain the behaviour of the compiler. However, since the
compiler accepts zero-sized arrays, it is already in violation
with C99 and one cannot use C99 as a basis to explain the
any behaviour of the compiler in the context of the non-compliant
construct. The creation of single-element array instead of
the declared zero-element array is downright broken.
My $0.02
--
Marcel Moolenaar USPA: A-39004 marcel@xcllnt.net
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