From: Brian Drummond <brian@shapes.demon.co.uk>
To: gcc-help@gcc.gnu.org
Subject: Re: how to make gcc warn about arithmetic signed overflow
Date: Sat, 21 Sep 2013 17:36:00 -0000 [thread overview]
Message-ID: <1379785029.2477.8.camel@Gannet.Four> (raw)
In-Reply-To: <20130921164609.GC3086@a.lan>
On Sat, 2013-09-21 at 18:46 +0200, wempwer@gmail.com wrote:
> int ab = 50000;
> int bc = 50000;
> int r = ab * bc;
>
> Is it possible for gcc to produce a
> warning in such situation?
Yes, gcc the Gnu Compiler Collection can produce such a warning:
procedure test_ovf is
ab : integer := 50000;
bc : integer := 50000;
r : integer := ab * bc;
begin
null;
end test_ovf;
gcc -c test_ovf.adb
test_ovf.adb:4:22: warning: value not in range of type
"Standard.Integer"
test_ovf.adb:4:22: warning: "Constraint_Error" will be raised at run
time
However I'm not sure it is allowed to do the same with C.
- Brian
next prev parent reply other threads:[~2013-09-21 17:36 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-21 16:45 wempwer
2013-09-21 17:24 ` Jonathan Wakely
2013-09-21 17:41 ` wempwer
2013-09-21 18:30 ` Jonathan Wakely
2013-09-21 18:50 ` wempwer
2013-09-21 19:55 ` Jędrzej Dudkiewicz
2013-09-21 20:16 ` wempwer
2013-09-21 20:52 ` Jędrzej Dudkiewicz
2013-09-21 21:07 ` wempwer
2013-09-23 4:04 ` James K. Lowden
2013-09-23 7:55 ` Jonathan Wakely
2013-09-23 15:47 ` James K. Lowden
2013-09-23 21:50 ` Jonathan Wakely
2013-09-23 22:44 ` James K. Lowden
2013-09-23 23:20 ` Jonathan Wakely
2013-09-23 19:38 ` Dave Allured - NOAA Affiliate
2013-09-23 19:43 ` Oleg Endo
2013-09-23 20:37 ` Dave Allured - NOAA Affiliate
2013-09-23 19:48 ` Andrew Haley
2013-09-23 22:00 ` James K. Lowden
2013-09-24 17:48 ` Andrew Haley
2013-09-26 2:30 ` James K. Lowden
2013-09-26 8:29 ` Vincent Lefevre
2013-09-26 14:49 ` Andrew Haley
2013-09-26 17:03 ` Vincent Lefevre
2013-09-26 18:19 ` Andrew Haley
2013-09-27 7:58 ` Vincent Lefevre
2013-09-27 8:23 ` Andrew Haley
2013-09-27 9:28 ` Vincent Lefevre
2013-09-27 9:43 ` Andrew Haley
2013-09-26 17:41 ` Andrew Haley
2013-09-24 7:42 ` Brian Drummond
2013-09-21 17:53 ` Marc Glisse
2013-09-21 18:09 ` wempwer
2013-09-21 18:27 ` Jonathan Wakely
2013-09-21 19:32 ` wempwer
2013-09-22 15:52 ` Jonathan Wakely
2013-09-23 13:04 ` David Brown
2013-09-21 17:36 ` Brian Drummond [this message]
2013-09-21 17:45 ` wempwer
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