[debbugs-tracker] bug#23894: closed (compilation fails with `-Og')

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Your message dated Tue, 5 Jul 2016 16:06:15 +0200
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and subject line Re: bug#23894: compilation fails with `-Og'
has caused the debbugs.gnu.org bug report #23894,
regarding compilation fails with `-Og'
to be marked as done.

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23894: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=23894
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--- Begin Message --- Subject: compilation fails with `-Og' Date: Mon, 4 Jul 2016 14:32:56 +0000 (UTC)

Hello,

Today I tried compiling gzip with `CFLAGS = -ggdb3 -Og', which resulted in the following error 

gzip.c: In function 'main':

gzip.c:609:19: error: 'optc' may be used uninitialized in this function [-Werror=maybe-uninitialized]

                   fprintf (stderr, "-%c: ", optc - ENV_OPTION);

After messing around a bit I found that the problem is with the `-Og' flag. With the default `-O2' the compilation is sucessful.

As expected, by initialising the 'optc' variable the error goes away. I'm just not sure if any value is good for the initialisation.

Regards,

Gonçalo Ribeiro

--- End Message ---

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> Subject: 
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> Re: bug#23894: compilation fails with `-Og'
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> Date: 
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> Tue, 5 Jul 2016 16:06:15 +0200
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> User-agent: 
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> Mozilla/5.0 (X11; Linux i686; rv:38.0) Gecko/20100101 Thunderbird/38.8.0
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> On 07/04/2016 04:32 PM, Gonçalo Ribeiro wrote:
> > As expected, by initialising the 'optc' variable the error goes away.
>
> The optc variable is always initialized anyway, so there should be no 
> need to add extra initialization for it. The problem is that your 
> compiler is issuing a false alarm in some cases. Since this is merely a 
> warning and the warning is incorrect, I wouldn't worry about it.
>
>
> --- End Message ---