[Bug c++/48370] New: G++ fails to extend reference temporary lifetime in some situations

["jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48370

           Summary: G++ fails to extend reference temporary lifetime in
                    some situations
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: major
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jason@gcc.gnu.org


In addition to the issue described in bug 26714, we fail to extend the
temporary lifetime if the reference we're binding to is a subobject:

extern "C" void abort();
bool ok;

struct A {
  A(int) { }
  ~A() { if (!ok) abort(); }
};

struct C
{
  const A& ar;
};

int main()
{
  C c = { 1 };
  ok = true;
}

This problem is more severe in C++0x, where you can have initializer_list
subobjects:

// Test that we properly extend the lifetime of the initializer_list
// array even if the initializer_list is a subobject.
// { dg-options -std=c++0x }
// { dg-do run }

#include <initializer_list>

extern "C" void abort();
bool ok;

struct A {
  A(int) { }
  ~A() { if (!ok) abort(); }
};

typedef std::initializer_list<A> AL;
typedef std::initializer_list<AL> AL2;
typedef std::initializer_list<AL2> AL3;

struct B {
  AL al;
  const AL& alr;
};

int main()
{
  AL ar[] = {{1,2},{3,4}};
  B b = {{5,6},{7,8}};
  AL3 al3 = {{{1},{2},{3}}};
  ok = true;
}