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* [Bug c/63510] New: Wrong line number in Wstrict-overflow message
@ 2014-10-11  7:12 ibuclaw at ubuntu dot com
  2014-10-11 14:34 ` [Bug middle-end/63510] " manu at gcc dot gnu.org
                   ` (11 more replies)
  0 siblings, 12 replies; 13+ messages in thread
From: ibuclaw at ubuntu dot com @ 2014-10-11  7:12 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63510

            Bug ID: 63510
           Summary: Wrong line number in Wstrict-overflow message
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ibuclaw at ubuntu dot com

Tested on gcc (GCC) 5.0.0 20140901 (experimental)


Building GDB fails with the following error - both of which show the wrong
line.

../../gdb/i387-tdep.c: In function ‘i387_supply_fsave’:
../../gdb/i387-tdep.c:447:1: error: assuming signed overflow does not occur
when assuming that (X + c) >= X is always true [-Werror=strict-overflow]
 i387_supply_fsave (struct regcache *regcache, int regnum, const void *fsave)
 ^
../../gdb/i387-tdep.c: In function ‘i387_collect_fsave’:
../../gdb/i387-tdep.c:502:1: error: assuming signed overflow does not occur
when assuming that (X + c) >= X is always true [-Werror=strict-overflow]
 i387_collect_fsave (const struct regcache *regcache, int regnum, void *fsave)
 ^


Reduced to the following code, which shows both the correct and wrong line.

gcc -O2 -Wall -Wextra -c i387-tdep.c
---
int st0_regnum;

void i387_supply_fsave ()
{
  int i;
  for (i = st0_regnum; i < st0_regnum + 16;)
    {
    }
}
---
i387-tdep.c: In function ‘i387_supply_fsave’:
i387-tdep.c:9:1: warning: assuming signed overflow does not occur when assuming
that (X + c) >= X is always true [-Wstrict-overflow]
 }
 ^
i387-tdep.c:6:3: warning: assuming signed overflow does not occur when assuming
that (X + c) >= X is always true [-Wstrict-overflow]
   for (i = st0_regnum; i < st0_regnum + 16;)
   ^
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From: "ibuclaw at ubuntu dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/63510] Wrong line number in Wstrict-overflow message
Date: Sat, 11 Oct 2014 07:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idc510

--- Comment #1 from Iain Buclaw <ibuclaw at ubuntu dot com> ---
> Reduced to the following code, which shows both the correct and wrong line.

But perhaps the wrong column information.


^ permalink raw reply	[flat|nested] 13+ messages in thread
end of thread, other threads:[~2024-04-10 23:16 UTC | newest]

Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2014-10-11  7:12 [Bug c/63510] New: Wrong line number in Wstrict-overflow message ibuclaw at ubuntu dot com
2014-10-11 14:34 ` [Bug middle-end/63510] " manu at gcc dot gnu.org
2015-01-07 15:00 ` gang.chen.5i5j at gmail dot com
2015-01-09 21:42 ` gang.chen.5i5j at gmail dot com
2015-08-04 14:01 ` ibuclaw at ubuntu dot com
2015-08-04 16:45 ` manu at gcc dot gnu.org
2015-08-05 14:49 ` xili_gchen_5257 at hotmail dot com
2015-08-25 22:39 ` gang.chen.5i5j at gmail dot com
2015-08-29  0:17 ` gang.chen.5i5j at gmail dot com
2015-08-29 13:00 ` gang.chen.5i5j at gmail dot com
2015-09-04  3:33 ` gang.chen.5i5j at gmail dot com
2015-10-24 16:33 ` gang.chen.5i5j at gmail dot com
2024-04-10 23:16 ` pinskia at gcc dot gnu.org

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