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* [Bug c++/51457] New: Add warning about impossible boolean comparisons
@ 2011-12-07 20:27 lloyd at randombit dot net
2011-12-14 23:11 ` [Bug c++/51457] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: lloyd at randombit dot net @ 2011-12-07 20:27 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51457
Bug #: 51457
Summary: Add warning about impossible boolean comparisons
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: lloyd@randombit.net
Neither GCC 4.6.0 (release) and 4.7 svn (r181390) warn about the impossible
comparison in
bool f(bool b)
{
return (b == 'a');
}
The optimizer figures out it is always false and will optimize it to
xorl %eax, %eax
ret
>From the description in the manual I would have expected -Wtype-limits to
detect this case.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/51457] Add warning about impossible boolean comparisons
2011-12-07 20:27 [Bug c++/51457] New: Add warning about impossible boolean comparisons lloyd at randombit dot net
@ 2011-12-14 23:11 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2011-12-14 23:11 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51457
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |DUPLICATE
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-12-14 23:09:55 UTC ---
Dup of bug 44077
*** This bug has been marked as a duplicate of bug 44077 ***
^ permalink raw reply [flat|nested] 2+ messages in thread
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2011-12-07 20:27 [Bug c++/51457] New: Add warning about impossible boolean comparisons lloyd at randombit dot net
2011-12-14 23:11 ` [Bug c++/51457] " pinskia at gcc dot gnu.org
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