[Bug c/53129] New: Wself-assign

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53129

             Bug #: 53129
           Summary: Wself-assign
    Classification: Unclassified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: c
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: m...@gcc.gnu.org


void func()
{
  int i = 2;
  int x = 0;   /* warn */
  float f = 5.0;
  double a[3];

  i = i + 0;   /* not warn */
  f = f / 1;   /* not warn */
  a[1] = a[1]; /* warn */
  i += 0;      /* not warn */
  x = x;      /* warn */
}

manuel@gcc12:~$ clang -fsyntax-only -Wself-assign wselfassign.c
wselfassign.c:12:5: warning: explicitly assigning a variable of type 'int' to
itself [-Wself-assign]
  x = x;      /* warn */
  ~ ^ ~
1 warning generated.

An implementation was submitted to GCC but never approved here:

http://gcc.gnu.org/ml/gcc-patches/2010-06/msg02390.html