https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103381
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-9 branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:4a641becb2c8fdca4e9c113b2dcf6cc5e8a6c04a commit r9-9840-g4a641becb2c8fdca4e9c113b2dcf6cc5e8a6c04a Author: Jonathan Wakely <jwak...@redhat.com> Date: Tue Nov 23 12:28:22 2021 +0000 libstdc++: Fix circular dependency for bitmap_allocator [PR103381] <ext/bitmap_allocator.h> includes <function>, and since C++17 that includes <unordered_map>. If std::allocator is defined in terms of __gnu_cxx::bitmap_allocator then you get a circular reference and bootstrap fails when compiling src/c++17/*.cc. libstdc++-v3/ChangeLog: PR libstdc++/103381 * include/ext/bitmap_allocator.h: Include <bits/stl_function.h> instead of <functional>. (cherry picked from commit 5459fa132a99e6037e5ccf1b49d617677a584ff8)
