Date: Sun, 5 Feb 2006 16:56:57 +0100 From: Max Laier <max@love2party.net> To: "M. Warner Losh" <imp@bsdimp.com> Cc: des@des.no, Stefan Farfeleder <stefanf@freebsd.org>, freebsd-arch@freebsd.org Subject: Re: [releng_6 tinderbox] failure on sparc64/sparc64 Message-ID: <200602051657.06224.max@love2party.net> In-Reply-To: <20060205084813.GN21806@wombat.fafoe.narf.at> References: <20060204211357.GD7604@ip.net.ua> <20060204.155856.39766510.imp@bsdimp.com> <20060205084813.GN21806@wombat.fafoe.narf.at>
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On Sunday 05 February 2006 09:48, Stefan Farfeleder wrote:
> On Sat, Feb 04, 2006 at 03:58:56PM -0700, M. Warner Losh wrote:
> > This driver wants to access these structures as arrays of uint32_t.
> > It used to cast directly, but that isn't allowed. So, I've passed
> > the cast through a (void *). Is that allowed? Eg:
> >
> > struct foo foo;
> > ((uint32_t *)(void *)&foo)[3] =3D 12;
> >
> > is that OK?
>
> I'm afraid that only silences the warning without solving the underlying
> problem. I don't think there's a Standard conforming way to treat a
> struct foo as an uint32_t array.
You could embed the original struct contents with an uint32_t array in an=20
union. That way you don't even have to cast.
e.g.:
struct foo {
union {
struct foo_orig {
field1;
field2;
} orig;
uint32_t array[SIZE];
} wrap;
#define field1 wrap.orig.field1
#define field2 wrap.orig.field2
};
You should obviously make sure that the fields are named uniquely and the=20
header is private to you.
=2D-=20
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