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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c/59801] GCC does not warn on unused global variable Date: Thu, 16 Jan 2014 08:38:00 -0000 [thread overview] Message-ID: <bug-59801-4-nZyh4wx4ZE@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-59801-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59801 --- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Those two cases are different, the other PR was about automatic volatile variables, where if they are unused it is really hard to come up with a way how they could be modified behind compiler's back. While for this case, variable in .data/.bss etc. section it is not so hard, the variable has a name through which it can be referenced, eventhough only from within the same assembly file. User could inject some assembly which will access it, the var can use section attribute that places it into some magic section that is e.g. IO mapped, etc.
next prev parent reply other threads:[~2014-01-16 8:38 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-01-14 8:26 [Bug c/59801] New: " chengniansun at gmail dot com 2014-01-14 9:02 ` [Bug c/59801] " jakub at gcc dot gnu.org 2014-01-14 17:32 ` chengniansun at gmail dot com 2014-01-16 6:08 ` su at cs dot ucdavis.edu 2014-01-16 6:33 ` pinskia at gcc dot gnu.org 2014-01-16 6:34 ` pinskia at gcc dot gnu.org 2014-01-16 6:52 ` su at cs dot ucdavis.edu 2014-01-16 8:38 ` jakub at gcc dot gnu.org [this message] 2014-01-16 21:18 ` su at cs dot ucdavis.edu 2014-01-16 21:27 ` jakub at gcc dot gnu.org
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