Date: Fri, 14 Mar 2008 17:16:39 -0500 From: Derek Ragona <derek@computinginnovations.com> To: Doug Hardie <bc979@lafn.org>, freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: C compiler issue perhaps? Message-ID: <6.0.0.22.2.20080314171533.023f7c88@mail.computinginnovations.com> In-Reply-To: <A768FF06-4601-42C6-A491-634F5135DCCD@lafn.org> References: <A768FF06-4601-42C6-A491-634F5135DCCD@lafn.org>
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At 05:10 PM 3/14/2008, Doug Hardie wrote:
>I have a program I was testing with gdb. I was trying to figure out
>why c.rmonths was always zero when it should have been 6. Stepped
>through using the gdb n command. Here is the output:
>
>(gdb)
>215 c.rmonths = (edate - tdate) / toMONTHS;
>(gdb)
>223 c.dial_in = u.dial_in[0];
>(gdb)
>224 c.dsl = u.dsl[0];
>(gdb) p c.rmonths
>$1 = 0
>(gdb) p c
>$2 = {fa = 0, pwp = 0, disp_email = 0, imonths = 0, rmonths = 6,
> type = 73 'I', cd = 0 '\0', dial_in = 82 'R', dsl = 0 '\0',
> dsl_kit = 0 '\0', ip = 0 '\0', domain = 0 '\0', n_domain = 0 '\0',
> renewal = 89 'Y', program = "I\000\000"}
>(gdb) p c->rmonths
>$3 = 6
>(gdb) p c.rmonths
>$4 = 6
>
>
>Notice, the first time i print it its zero. The second time its 6.
>What gives here? I have seen this before but couldn't pin it down.
>The program is not compiled with any optimization. It is in a shared
>library though.
It is hard to tell without the code you used. I would put some printf's in
the code and see what and when that variable gets set to in actual running
code.
-Derek
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