[Bug c++/49974] New: missing warning for indirectly returning reference to local/temporary

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49974

           Summary: missing warning for indirectly returning reference to
                    local/temporary
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: r...@gcc.gnu.org


Although probably not easy, it would be useful to get warnings from this code
which creates dangling references:

struct X { };

inline const X& f(const X& r) { return r; }

const X& g()
{
    X x;
    return f(x);  // !!!
}

const X& h()
{
    return f(X()); // !!!
}

Another case involves a reference as a member of a class:

struct Y {
    Y(int& i) : r(i) { }
    int& r;
};

Y f()
{
    int i=0;
    return Y(i);
}