Date: Tue, 04 Aug 1998 18:49:27 -0700 From: Mike Smith <mike@smith.net.au> To: Terry Lambert <tlambert@primenet.com> Cc: chuckr@glue.umd.edu (Chuck Robey), Nicolas.Souchu@prism.uvsq.fr, freebsd-hackers@FreeBSD.ORG Subject: Re: C and static initialization with unions Message-ID: <199808050149.SAA01073@dingo.cdrom.com> In-Reply-To: Your message of "Wed, 05 Aug 1998 01:03:14 -0000." <199808050103.SAA27705@usr02.primenet.com>
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> > > union foo_t {
> > > int i;
> > > char c;
> > > void *p;
> > > };
> > >
> > > static union foo_t bar = { (void *)&anyvar };
> >
> > No, you forgot to mention which union memeber to use. Your foo_t.p
> > would do nicely.
>
> 1) This is a vendor extension.
>
> 2) That vendor isn't FSF or Cygnus.
>
> 3) It's "foo_t bar.p", not "foo_t.p bar".
>
> 4) It still breaks for:
>
> typedef enum { UT_INT, UT_CHAR, UT_PTR } ut_t;
>
> typedef struct {
> ut_t u_type;
> struct foo_t u; /* someone blew a typedef*/
> } bob_t;
>
> bob_t bobs.p[] = {
> { UT_PTR, &anyvar },
> { UT_INT, 35 }, /* oops!*/
> { UT_PTR, NULL }
> };
>
The gcc info "extensions/named elements" section describes a useful
extension that lets you cut through much of this crap.
--
\\ Sometimes you're ahead, \\ Mike Smith
\\ sometimes you're behind. \\ mike@smith.net.au
\\ The race is long, and in the \\ msmith@freebsd.org
\\ end it's only with yourself. \\ msmith@cdrom.com
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