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* [Bug c/20550] New: Silencing the warning: comparison is always true due to limited range of data type @ 2005-03-19 10:51 qrczak at knm dot org dot pl 2005-03-19 12:14 ` [Bug c/20550] " joseph at codesourcery dot com 2005-03-20 17:50 ` pinskia at gcc dot gnu dot org 0 siblings, 2 replies; 3+ messages in thread From: qrczak at knm dot org dot pl @ 2005-03-19 10:51 UTC (permalink / raw) To: gcc-bugs It would be nice if the warning "comparison is always true due to limited range of data type" could be turned off. From looking at the gcc source I conclude it can't. I couldn't find a workaround which generates the same code (casting the smaller type to the wider type just for the comparison doesn't silence the warning, using a wider type for the variable generates worse code). Yet better if it could be turned off locally. I know which comparisons in my C macro may trigger it, and it would make sense to turn it off only in these places. -- Summary: Silencing the warning: comparison is always true due to limited range of data type Product: gcc Version: 4.0.0 Status: UNCONFIRMED Severity: enhancement Priority: P2 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: qrczak at knm dot org dot pl CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: i686-pc-linux-gnu GCC host triplet: i686-pc-linux-gnu GCC target triplet: i686-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20550 ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c/20550] Silencing the warning: comparison is always true due to limited range of data type 2005-03-19 10:51 [Bug c/20550] New: Silencing the warning: comparison is always true due to limited range of data type qrczak at knm dot org dot pl @ 2005-03-19 12:14 ` joseph at codesourcery dot com 2005-03-20 17:50 ` pinskia at gcc dot gnu dot org 1 sibling, 0 replies; 3+ messages in thread From: joseph at codesourcery dot com @ 2005-03-19 12:14 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From joseph at codesourcery dot com 2005-03-19 12:02 ------- Subject: Re: New: Silencing the warning: comparison is always true due to limited range of data type On Sat, 19 Mar 2005, qrczak at knm dot org dot pl wrote: > It would be nice if the warning "comparison is always true due to limited range > of data type" could be turned off. From looking at the gcc source I conclude it > can't. I couldn't find a workaround which generates the same code (casting the > smaller type to the wider type just for the comparison doesn't silence the > warning, using a wider type for the variable generates worse code). I've suggesting moving this warning to an option -Wcomparison-fixed, not on by default and not in -Wall but included in -Wextra. See bug 12963. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20550 ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c/20550] Silencing the warning: comparison is always true due to limited range of data type 2005-03-19 10:51 [Bug c/20550] New: Silencing the warning: comparison is always true due to limited range of data type qrczak at knm dot org dot pl 2005-03-19 12:14 ` [Bug c/20550] " joseph at codesourcery dot com @ 2005-03-20 17:50 ` pinskia at gcc dot gnu dot org 1 sibling, 0 replies; 3+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-03-20 17:50 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-03-20 17:50 ------- *** This bug has been marked as a duplicate of 12963 *** -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |DUPLICATE http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20550 ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2005-03-20 17:50 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-03-19 10:51 [Bug c/20550] New: Silencing the warning: comparison is always true due to limited range of data type qrczak at knm dot org dot pl 2005-03-19 12:14 ` [Bug c/20550] " joseph at codesourcery dot com 2005-03-20 17:50 ` pinskia at gcc dot gnu dot org
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