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From: "chengniansun at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c/64610] New: No -Wbool-compare warning on "(0 != a) >= 0" Date: Thu, 15 Jan 2015 07:50:00 -0000 [thread overview] Message-ID: <bug-64610-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64610 Bug ID: 64610 Summary: No -Wbool-compare warning on "(0 != a) >= 0" Product: gcc Version: 5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: chengniansun at gmail dot com There is no warning on the expression "(0 != a) >= 0". I think the cause of this bug is different from the one I reported just now (PR64609). $: cat s.c int a; void fn1() { ((0 != a) >= 0); } $: $: gcc-trunk -Wbool-compare -c s.c $: $: clang-trunk -Wno-unused-value -c s.c s.c:2:24: warning: comparison of constant 0 with boolean expression is always true [-Wtautological-constant-out-of-range-compare] void fn1() { ((0 != a) >= 0); } ~~~~~~~~ ^ ~ 1 warning generated. $: $:
next reply other threads:[~2015-01-15 7:50 UTC|newest] Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-01-15 7:50 chengniansun at gmail dot com [this message] 2015-01-16 6:38 ` [Bug c/64610] " chengniansun at gmail dot com 2015-01-23 5:20 ` mpolacek at gcc dot gnu.org 2015-03-17 6:56 ` mpolacek at gcc dot gnu.org 2015-04-27 16:49 ` mpolacek at gcc dot gnu.org 2015-04-29 18:14 ` mpolacek at gcc dot gnu.org 2015-04-29 18:17 ` mpolacek at gcc dot gnu.org
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