import std with gcc-15 (libstdc++)

From version 15, libstdc++ ships with support for the std and std.compat modules (located under /usr/include/c++/15/bits/std.cc and /usr/include/c++/15/bits/std.compat.cc in a standard Ubuntu 25.10 installation). Is there plans to support it in CMake? Anything I could do to help? Thanks.

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