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* [Bug c++/18821] New: Please add warning if bits thrown away in integral conversions
@ 2004-12-04 1:16 gccbugzilla at spamit dot net
2004-12-04 1:20 ` [Bug c++/18821] " gccbugzilla at spamit dot net
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: gccbugzilla at spamit dot net @ 2004-12-04 1:16 UTC (permalink / raw)
To: gcc-bugs
I'd like to get a warning for code like this:
#include <iostream>
using namespace std;
int main()
{
unsigned long four = 400000;
unsigned short two;
two = four;
cout << two << endl;
}
/home/enadler/test/compilerwarnings $ g++ -Werror -Wall -Wconversion -ansi
gccbugreport.cc && a.out
6784
I think GCC is doing the right thing by allowing this code uncasted, and
it is described this way in Bjarne's C++ Programming Language, Special
Edition C.6.2.1.
However, it seems reasonable to me that a warning option should be available
to notify the programmer that data is being thrown away.
Thanks!
Eric
--
Summary: Please add warning if bits thrown away in integral
conversions
Product: gcc
Version: 3.2.3
Status: UNCONFIRMED
Severity: enhancement
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: gccbugzilla at spamit dot net
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18821
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/18821] Please add warning if bits thrown away in integral conversions
2004-12-04 1:16 [Bug c++/18821] New: Please add warning if bits thrown away in integral conversions gccbugzilla at spamit dot net
@ 2004-12-04 1:20 ` gccbugzilla at spamit dot net
2004-12-06 5:14 ` [Bug c/18821] " pinskia at gcc dot gnu dot org
2005-02-01 21:11 ` [Bug c++/18821] " jsm28 at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: gccbugzilla at spamit dot net @ 2004-12-04 1:20 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From gccbugzilla at spamit dot net 2004-12-04 01:20 -------
Installed Red Hat Advanced Server 3.0, update 1
Dell PowerEdge 1750: Intel Xeon 2.4GHz
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit --host=i386-redhat-linux
Thread model: posix
gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-24)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18821
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/18821] Please add warning if bits thrown away in integral conversions
2004-12-04 1:16 [Bug c++/18821] New: Please add warning if bits thrown away in integral conversions gccbugzilla at spamit dot net
2004-12-04 1:20 ` [Bug c++/18821] " gccbugzilla at spamit dot net
@ 2004-12-06 5:14 ` pinskia at gcc dot gnu dot org
2005-02-01 21:11 ` [Bug c++/18821] " jsm28 at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-12-06 5:14 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-12-06 05:14 -------
Confirmed, I thought I saw a bug about this before.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Component|c++ |c
Ever Confirmed| |1
Keywords| |diagnostic
Last reconfirmed|0000-00-00 00:00:00 |2004-12-06 05:14:11
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18821
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/18821] Please add warning if bits thrown away in integral conversions
2004-12-04 1:16 [Bug c++/18821] New: Please add warning if bits thrown away in integral conversions gccbugzilla at spamit dot net
2004-12-04 1:20 ` [Bug c++/18821] " gccbugzilla at spamit dot net
2004-12-06 5:14 ` [Bug c/18821] " pinskia at gcc dot gnu dot org
@ 2005-02-01 21:11 ` jsm28 at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: jsm28 at gcc dot gnu dot org @ 2005-02-01 21:11 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From jsm28 at gcc dot gnu dot org 2005-02-01 21:10 -------
The example given is in C++, not C; the C version is bug 2707.
--
What |Removed |Added
----------------------------------------------------------------------------
Component|c |c++
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18821
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-02-01 21:11 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2004-12-04 1:16 [Bug c++/18821] New: Please add warning if bits thrown away in integral conversions gccbugzilla at spamit dot net
2004-12-04 1:20 ` [Bug c++/18821] " gccbugzilla at spamit dot net
2004-12-06 5:14 ` [Bug c/18821] " pinskia at gcc dot gnu dot org
2005-02-01 21:11 ` [Bug c++/18821] " jsm28 at gcc dot gnu dot org
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