From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Mon,  1 Apr 2019 17:35:32 -0700
From: Kurt H Maier <khm@sciops.net>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Message-ID: <20190402003532.GA55021@wopr>
References: <CAFMepcn3NR=phN=yp3Y0qeQ12jf40_Q_1krVZUm=2-bUCcMYOw@mail.gmail.com>
	<43a5572d-ea50-41a8-9897-9900f13c5a00@www.fastmail.com>
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In-Reply-To: <43a5572d-ea50-41a8-9897-9900f13c5a00@www.fastmail.com>
Subject: Re: [9fans] Don't Plan 9 C compiler initialize the rest of member
 of a?struct?
Topicbox-Message-UUID: f7ce7bb8-ead9-11e9-9d60-3106f5b1d025

On Mon, Apr 01, 2019 at 08:26:30PM -0400, Jeremy O'Brien wrote:
> On Mon, Apr 1, 2019, at 11:33, Kyohei Kadota wrote:
> > Hi, 9fans. I use 9legacy.
> >
> > About below program, I expected that flags field will initialize to
> > zero but the value of flags was a garbage, ex, "f8f7".
> > Is this expected?
> >
> > ```
> > #include <stdio.h>
> >
> > struct option {
> >     int n;
> >     char *s;
> >     int flags;
> > };
> >
> > int
> > main(void)
> > {
> >     struct option opt = {1, "test"};
> >     printf("%d %s %x\n", opt.n, opt.s, opt.flags);
> >     return 0;
> > }
> > ```
> >
> >
>
> According to C99: "If an object that has automatic storage duration is not initialized explicitly, its value is indeterminate."
>
> Stack variable == automatic storage duration. This appears to be correct behavior to me.
>

Can anyone provide the patches 9legacy uses to implement C99 compliance?


Thanks in advance,
khm