Date: Fri, 14 Mar 2008 16:56:18 -0700 From: Doug Hardie <bc979@lafn.org> To: Derek Ragona <derek@computinginnovations.com> Cc: freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: C compiler issue perhaps? Message-ID: <511EC772-36FD-4799-B4A1-3AE690B6D048@lafn.org> In-Reply-To: <6.0.0.22.2.20080314171533.023f7c88@mail.computinginnovations.com> References: <A768FF06-4601-42C6-A491-634F5135DCCD@lafn.org> <6.0.0.22.2.20080314171533.023f7c88@mail.computinginnovations.com>
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There is no code running at that point. Its just sitting there
waiting for me to enter a gdb command.
On Mar 14, 2008, at 15:16, Derek Ragona wrote:
> 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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