[Bug c/79029] New: [7 Regression] UB in gimple-ssa-sprintf.c:582:17: runtime error: negation of -9223372036854775808 cannot be represented in type 'long int';

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79029

            Bug ID: 79029
           Summary: [7 Regression] UB in gimple-ssa-sprintf.c:582:17:
                    runtime error: negation of -9223372036854775808 cannot
                    be represented in type 'long int';
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
                CC: msebor at gcc dot gnu.org
  Target Milestone: ---

Since r240298 bootstrap-ubsan shows:

gcc/gimple-ssa-sprintf.c:582:17: runtime error: negation of
-9223372036854775808 cannot be represented in type 'long int'; cast to an
unsigned type to negate this value to itself