[Bug libstdc++/81751] [5/6/7 Regression]__basic_file::sync() may flush _all_ files

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81751

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed for 5.5, 6.5 and 7.3