[PATCH] Fix libstdc++/6503

[Paolo Carlini]

Gabriel Dos Reis wrote:

>Well, my remark was based on your description:
>
>   I have fixed this PR according to Scott Meyers' guideline about 
>   comparison operators as non-member functions (Effective STL, 119): now 
>   all the _Deque_iterator comparison operators are non-members
>
>and the removal of member comparaison operators.  So I wanted to know
>whether that isn't an ABI change.
>
I see.

Therefore, just to be completely clear, now that I have added that 
missing information (sorry) about the non-existence of instantiations of 
deque in the libstdc++.so binary, do you agree that there is no risk of 
ABI mismatches both ways?

Ciao, Paolo.