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Bug 1372072 - possible bogus warning "'timespan' may be used uninitialized"
Summary: possible bogus warning "'timespan' may be used uninitialized"
Keywords:
Status: CLOSED EOL
Alias: None
Product: Fedora
Classification: Fedora
Component: gcc
Version: 26
Hardware: s390x
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Jakub Jelinek
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks: ZedoraTracker
TreeView+ depends on / blocked
 
Reported: 2016-08-31 20:19 UTC by Dan Horák
Modified: 2018-05-29 11:46 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2018-05-29 11:46:42 UTC
Type: Bug
Embargoed:

Attachments (Terms of Use)
preprocessed source file (409.96 KB, application/x-gzip)
2016-08-31 20:19 UTC, Dan Horák 		no flags Details
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Description Dan Horák 2016-08-31 20:19:16 UTC 
Created attachment 1196494 [details]
preprocessed source file

When building gnome-calendar-3.21.91-1.fc26 on Fedora Rawhide on s390x arch I'm getting a warning that's treated as error due compiler flags and build breaks. But I think the code is correct and the warning is bogus.

...
  CC       gcal-quick-add-popover.o
  CC       gcal-search-view.o
  CC       gcal-shell-search-provider.o
gcal-month-view.c: In function 'gcal_month_view_drag_drop':
gcal-month-view.c:908:32: error: 'timespan' may be used uninitialized in this function [-Werror=maybe-uninitialized]
           GDateTime *new_end = g_date_time_add (new_start, timespan);
                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  CC       gcal-source-dialog.o
  CC       gcal-subscriber-view.o
  CC       gcal-time-selector.o
cc1: all warnings being treated as errors
Makefile:569: recipe for target 'gcal-month-view.o' failed
make[3]: *** [gcal-month-view.o] Error 1
...

Please see http://s390.koji.fedoraproject.org/koji/taskinfo?taskID=2333211 for full log.

command line to reproduce:
gcc -Wall -Werror -O2 gcal-month-view.i

using -O0 makes the warning to go away

https://git.gnome.org/browse/gnome-calendar/tree/src/gcal-month-view.c#n908 is the upstream git location

Version-Release number of selected component (if applicable):
gcc-6.1.1-6.fc26.s390x
Comment 1 Fedora End Of Life 2017-02-28 10:10:55 UTC 
This bug appears to have been reported against 'rawhide' during the Fedora 26 development cycle.
Changing version to '26'.
Comment 2 Fedora End Of Life 2018-05-03 08:32:27 UTC 
This message is a reminder that Fedora 26 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 26. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as EOL if it remains open with a Fedora  'version'
of '26'.

Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version'
to a later Fedora version.

Thank you for reporting this issue and we are sorry that we were not
able to fix it before Fedora 26 is end of life. If you would still like
to see this bug fixed and are able to reproduce it against a later version
of Fedora, you are encouraged  change the 'version' to a later Fedora
version prior this bug is closed as described in the policy above.

Although we aim to fix as many bugs as possible during every release's
lifetime, sometimes those efforts are overtaken by events. Often a
more recent Fedora release includes newer upstream software that fixes
bugs or makes them obsolete.
Comment 3 Fedora End Of Life 2018-05-29 11:46:42 UTC 
Fedora 26 changed to end-of-life (EOL) status on 2018-05-29. Fedora 26
is no longer maintained, which means that it will not receive any
further security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of
Fedora please feel free to reopen this bug against that version. If you
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bug.

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