GNU bug report logs - #23894
compilation fails with `-Og'

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#23894: closed (compilation fails with `-Og')
Date: Tue, 05 Jul 2016 14:07:02 +0000

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Your message dated Tue, 5 Jul 2016 16:06:15 +0200
with message-id <577BBED7.9010609 <at> cs.ucla.edu>
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.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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23894: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=23894
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From: Gonçalo Ribeiro <darklaw13 <at> yahoo.co.uk>
To: "bug-gzip <at> gnu.org" <bug-gzip <at> gnu.org>
Subject: compilation fails with `-Og'
Date: Mon, 4 Jul 2016 14:32:56 +0000 (UTC)

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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

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Gonçalo Ribeiro <darklaw13 <at> yahoo.co.uk>,
 23894-done <at> debbugs.gnu.org
Subject: Re: bug#23894: compilation fails with `-Og'
Date: Tue, 5 Jul 2016 16:06:15 +0200

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.

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