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* [Bug c++/23587] New: Missing "warning: comparison is always false due to limited range of data type"
@ 2005-08-27 0:15 v dot haisman at sh dot cvut dot cz
2005-08-27 0:22 ` [Bug c/23587] " pinskia at gcc dot gnu dot org
2005-08-27 2:29 ` pinskia at gcc dot gnu dot org
0 siblings, 2 replies; 3+ messages in thread
From: v dot haisman at sh dot cvut dot cz @ 2005-08-27 0:15 UTC (permalink / raw)
To: gcc-bugs
The following test warns about the comparison being always true only for two of
the six tests:
#include <cstdlib>
void a (unsigned char x)
{
if (x < 0)
abort ();
}
void b (unsigned short x)
{
if (x < 0)
abort ();
}
void c (unsigned int x)
{
if (x < 0)
abort ();
}
void d (unsigned long x)
{
if (x < 0)
abort ();
}
void e (unsigned long long x)
{
if (x < 0)
abort ();
}
void f (size_t x)
{
if (x < 0)
abort ();
}
wilx@logout:::~/tmp> g++ -save-temps -fverbose-asm -O3 -c test.cxx
test.cxx: In function 'void a(unsigned char)':
test.cxx:5: warning: comparison is always false due to limited range of data type
test.cxx: In function 'void b(short unsigned int)':
test.cxx:11: warning: comparison is always false due to limited range of data type
wilx@logout:::~/tmp> g++ -v
Using built-in specs.
Target: i386-unknown-freebsd4.10
Configured with: ../srcdir/configure --disable-nls
--enable-version-specific-runtime-libs --enable-dwarf2 --with-cpu=pentium3
--with-arch=pentium3 --with-system-zlib --disable-shared --prefix=/home/4/wilx
--enable-languages=c,c++,objc,ada --disable-sjlj-exceptions
--enable-shared=libstdc++ --enable-shared=libobjc
Thread model: posix
gcc version 4.1.0 20050821 (experimental)
--
Summary: Missing "warning: comparison is always false due to
limited range of data type"
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: v dot haisman at sh dot cvut dot cz
CC: gcc-bugs at gcc dot gnu dot org,v dot haisman at sh dot
cvut dot cz
GCC build triplet: i386-unknown-freebsd4.10
GCC host triplet: i386-unknown-freebsd4.10
GCC target triplet: i386-unknown-freebsd4.10
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23587
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c/23587] Missing "warning: comparison is always false due to limited range of data type"
2005-08-27 0:15 [Bug c++/23587] New: Missing "warning: comparison is always false due to limited range of data type" v dot haisman at sh dot cvut dot cz
@ 2005-08-27 0:22 ` pinskia at gcc dot gnu dot org
2005-08-27 2:29 ` pinskia at gcc dot gnu dot org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-08-27 0:22 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
Component|c++ |c
Keywords| |diagnostic
Known to work| |2.95.3 3.2.3 3.4.0 4.0.0
| |4.1.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23587
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c/23587] Missing "warning: comparison is always false due to limited range of data type"
2005-08-27 0:15 [Bug c++/23587] New: Missing "warning: comparison is always false due to limited range of data type" v dot haisman at sh dot cvut dot cz
2005-08-27 0:22 ` [Bug c/23587] " pinskia at gcc dot gnu dot org
@ 2005-08-27 2:29 ` pinskia at gcc dot gnu dot org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-08-27 2:29 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
Known to fail| |2.95.3 3.2.3 3.4.0 4.0.0
| |4.1.0
Known to work|2.95.3 3.2.3 3.4.0 4.0.0 |
|4.1.0 |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23587
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2005-08-27 0:22 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2005-08-27 0:15 [Bug c++/23587] New: Missing "warning: comparison is always false due to limited range of data type" v dot haisman at sh dot cvut dot cz
2005-08-27 0:22 ` [Bug c/23587] " pinskia at gcc dot gnu dot org
2005-08-27 2:29 ` pinskia at gcc dot gnu dot org
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