[Bug c/18624] GCC does not detect local variable set but never used

[aldot at gcc dot gnu dot org]

------- Comment #19 from aldot at gcc dot gnu dot org  2009-11-25 18:15 -------
(In reply to comment #18)
> http://gcc.gnu.org/ml/gcc-patches/2009-11/msg01392.html
> 

Wunused-var-1.c has these two tests:

void
f1 (void)
{
  int a;        /* { dg-warning "set but not used" } */
  int b;
  int c;
  c = 1;
  a = b = c;
}
Neither of them has side-effects nor is actually used, so warnings for all of
them should be emitted.

void
f2 (int x)
{
  int a;        /* { dg-warning "set but not used" } */
  int b;
  int c;        /* { dg-warning "set but not used" } */
  c = (a = x, b = x);
}
Same here AFAICS, also the PARM_DECL is unused.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18624