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

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Package: gzip;

Reported by: Gonçalo Ribeiro <darklaw13 <at> yahoo.co.uk>

Date: Mon, 4 Jul 2016 16:17:01 UTC

Severity: normal

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

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From: Gonçalo Ribeiro <darklaw13 <at> yahoo.co.uk>
To: 23894 <at> debbugs.gnu.org
Subject: bug#23894: 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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This bug report was last modified 8 years and 342 days ago.

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