Date: Fri, 13 Mar 1998 10:45:36 -0600 From: Jonathan Lemon <jlemon@americantv.com> To: shimon@simon-shapiro.org Cc: "Jonathan M. Bresler" <jmb@FreeBSD.ORG>, freebsd-current@FreeBSD.ORG Subject: Re: A question about sys/sys/queue.h Message-ID: <19980313104536.00177@right.PCS> In-Reply-To: <XFMail.980312215107.shimon@simon-shapiro.org>; from Simon Shapiro on Mar 03, 1998 at 09:51:07PM -0800 References: <199803130339.TAA10294@hub.freebsd.org> <XFMail.980312215107.shimon@simon-shapiro.org>
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On Mar 03, 1998 at 09:51:07PM -0800, Simon Shapiro wrote:
>
> On 13-Mar-98 Jonathan M. Bresler wrote:
> > Simon Shapiro wrote:
> >> Why was the definition of some macros changed
> >> from:
> >>
> >> #define FOO { ... }
> >>
> >> to:
> >>
> >> #define FOO do { ... } while(0)
> >>
> >> I thought these are the same...
> >>
> >
> > the difference lies in how you use them.
> > in the first case one writes "FOO"
> > in the second "FOO;"
Huh? Did I miss something, or am I too used to gcc? I thought
semicolons after braces were optional. The following code works:
main()
{
{ printf("hello world!\n"); };;;;;;
}
All the change does is make the trailing semicolon mandatory.
--
Jonathan
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