[Bug c++/4131] The C++ compiler don't place a const class object to ".rodata" section with non trivial constructor

[jakub at gcc dot gnu dot org]

------- Comment #24 from jakub at gcc dot gnu dot org  2010-06-28 11:05 -------
On:
extern "C" void abort ();

struct S
{
  int x;
  int y;
};

struct T
{
  int x;
  int y;
  T (int u, int v) : x (u), y (v) {}
};

extern const S s;
extern const T t, u;

int sx = s.x;
int tx = t.x;
const S s = { 1, 2 };
const T t (1, 2);
const T u (1, 2);
int ux = u.x;

int
main ()
{
  if (sx != 1 || tx != 0 || ux != 1)
    abort ();
  if (s.x != 1 || s.y != 2)
    abort ();
  if (t.x != 1 || t.y != 2)
    abort ();
  if (u.x != 1 || u.y != 2)
    abort ();
  return 0;
}

it is easy to spot whether this optimization would be possible or not by
looking at TREE_USED of the decl at check_initializer time.  It is set for t
(and s), but cleared for u.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=4131