[Bug c++/44362] Bogus set-but-not-used warning

["jakub at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #1 from jakub at gcc dot gnu dot org  2010-06-01 13:58 -------
More complete testcase:
/* { dg-options "-Wunused" } */
/* { dg-do compile } */

int
f1 (int u, int v)
{
  int a, b, c, d, e, f, g, h, i;
  a = u;
  b = v;
  c = u;
  d = v;
  e = u;
  f = v;
  g = u == 6 ? a : b;
  h = 0 ? c : d;
  i = 1 ? e : f;
  return g + h + i;
}

No warnings with C, two warnings with C++, apparently because
build_conditional_expr folds the created COND_EXPR before it has been marked.

Another testcase, again, no set but not used warnings in C but some in C++.
/* { dg-options "-Wunused" } */
/* { dg-do compile } */

void
f1 (int u, int v)
{
  int a, b, c, d, e, f;
  a = u;
  b = v;
  c = u;
  d = v;
  e = u;
  f = v;
  u == 6 ? a : b; /* { dg-warning "no effect" } */
  0 ? c : d; /* { dg-warning "no effect" } */
  1 ? e : f; /* { dg-warning "no effect" } */
}


-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44362