[Bug c++/19317] [4.0 Regression] removing a temporary return value when we cannot

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-01-10 05:03 -------
Also we only remove the temporary variable if the size is "large" which seems wrong.
Here is another example and the reason why it works with the C front-end is because we don't do NRV 
until late:
extern "C" void abort( void );

typedef struct A
{
    int width;
    int width1;
    int width3;
    int width5;
}A;

A bb( const A*this1, const A *r )
{
    A tmp;
    tmp.width = -1;
    tmp.width += this1->width < r->width ? this1->width : r->width;
    return tmp;
}
int main()
{
        A a;
        a.width = ( 10 );
        A b;
        b.width = (100);
        a = bb( &b, &a );
        if ( a.width != 9 )
               abort();
}

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19317