[Bug c/64279] New: Warning missing for "(cond) ? A : A" / if(cond) expr1; else expr1; // same expression in if and else branch

[burnus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64279

            Bug ID: 64279
           Summary: Warning missing for "(cond) ? A : A" / if(cond) expr1;
                    else expr1; // same expression in if and else branch
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org
                CC: mpolacek at gcc dot gnu.org

Related to PR63357 but for the branch and not for the condition.

In a real-world code, cppcheck detected: "Found duplicate branches for 'if' and
'else'.":

  if (_perimeter >= ci.perimeter)
    _perimeter  -= ci.perimeter;
  else
    _perimeter  -= ci.perimeter;

It would be nice if GCC could also detect those - at least when both branches
consist only of a simple statement - and similarly for "(cond) ? a : a".