Portable linking for C++17 std::filesystem

If using CMAKE_CXX_STANDARD=17 and std::filesystem, GCC requires linking of an extra library: stdc++fs. I think I read a while back the intention might be to fold this back into libstdc++ once it's finalised, but I can't find any references to that offhand.

If C++17 is enabled, would it be worth automatically linking to stdc++fs for GCC versions which require this? Likewise for any quirks in other compilers or libraries.

Or is there already some provision or workaround for this with current cmake?

Regards, Roger