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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
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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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