[Bug libstdc++/57440] Memory usage with future and std containers

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57440

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
You didn't answer the question about which mingw compiler you are using, the
standard mingw gcc does not support std::async.