[Bug libstdc++/51749] Including <algorithm> pollutes global namespace

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51749

--- Comment #24 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #23)
> changed, the question would be what should be the new G++ feature test macro
> defaults, for -std=gnu++{98,11,1y} I guess it should include the POSIX etc.
> stuff by default too, for -std=c++{98,11,1y} perhaps it should be strict and
> require users to use feature test macros explicitly.

That sounds good to me.