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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/66630] New: Missing ubsan/ftrapv error
Date: Mon, 22 Jun 2015 16:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66630

            Bug ID: 66630
           Summary: Missing ubsan/ftrapv error
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

int
main (void)
{
  int i = -__INT_MAX__ - 1;
  int j = -i - 1;
  return j;
}

$ xgcc -fsanitize=undefined a.c; ./a.out

says nothing :(.  We should report the overflow when computing -i.