Passing temprary by reference requires copy constructor in 3.4?

[Paolo Bonzini]

>> Indeed, however seems that std commitee is removing the restriction. 
>> Hence I would like to see a flag to disable the error (if there is not one 
>> already and I am just not aware of it). I am refering to the DR 391.
> 
> Why, the DR is still active so GCC is correct as of right now.
> If and when the DR goes to defect, we will implement the needed
> change.  But currently GCC is following the standard.

It could be material for -fpermissive.  But surely not now that mainline 
is stage3.

Paolo