[Bug libstdc++/120325] [Regression] GCC-15 cannot build LLVM 20.1.5 with CMAKE_CXX_STANDARD=20

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120325

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I've added a note about this to
https://gcc.gnu.org/gcc-15/porting_to.html#cxx20-iterators