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[Bug c/63510] New: Wrong line number in Wstrict-overflow message


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 âi387_supply_fsaveâ:
../../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 âi387_collect_fsaveâ:
../../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 âi387_supply_fsaveâ:
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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