broken link on this page https://gcc.gnu.org/gcc-7/changes.html for link to "Profile Mode" page:

[Sergei Kurenkov]

Link on this page https://gcc.gnu.org/gcc-7/changes.html for "Profile Mode":

* The libstdc++ Profile Mode has been deprecated and will be removed
in a future version.

gives:

Not Found

The requested URL
/onlinedocs/gcc-7.1.0/libstdc++/manual/profile_mode.html was not found
on this server.