https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103400
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Jonathan Wakely from comment #0) > And --enable-libstdcxx-allocator=bitmap is completely broken, see PR 103381. Repeating PR 103381 comment 4: Every test fails with: /usr/bin/ld: .../libstdc++-v3/src/.libs/libstdc++.so: undefined reference to `__gnu_cxx::bitmap_allocator<unsigned int>::_S_last_request' /usr/bin/ld: .../libstdc++-v3/src/.libs/libstdc++.so: undefined reference to `__gnu_cxx::bitmap_allocator<std::_Sp_counted_ptr_inplace<std::mutex, std::allocator<std::mutex>, (__gnu_cxx::_Lock_policy)2> >::_S_mut' /usr/bin/ld: .../libstdc++-v3/src/.libs/libstdc++.so: undefined reference to `__gnu_cxx::bitmap_allocator<std::_Sp_counted_ptr_inplace<std::__future_base::_State_baseV2, std::allocator<std::__future_base::_State_baseV2>, (__gnu_cxx::_Lock_policy)2> >::_S_mut' /usr/bin/ld: .../libstdc++-v3/src/.libs/libstdc++.so: undefined reference to `__gnu_cxx::bitmap_allocator<std::_Sp_counted_ptr_inplace<std::mutex, std::allocator<std::mutex>, (__gnu_cxx::_Lock_policy)2> >::_S_mem_blocks' /usr/bin/ld: .../libstdc++-v3/src/.libs/libstdc++.so: undefined reference to `__gnu_cxx::bitmap_allocator<std::_Sp_counted_ptr_inplace<std::__future_base::_State_baseV2, std::allocator<std::__future_base::_State_baseV2>, (__gnu_cxx::_Lock_policy)2> >::_S_last_request' /usr/bin/ld: .../libstdc++-v3/src/.libs/libstdc++.so: undefined reference to `__gnu_cxx::bitmap_allocator<unsigned int>::_S_mut' /usr/bin/ld: .../libstdc++-v3/src/.libs/libstdc++.so: undefined reference to `__gnu_cxx::bitmap_allocator<unsigned int>::_S_mem_blocks' /usr/bin/ld: .../libstdc++-v3/src/.libs/libstdc++.so: undefined reference to `__gnu_cxx::bitmap_allocator<std::_Sp_counted_ptr_inplace<std::mutex, std::allocator<std::mutex>, (__gnu_cxx::_Lock_policy)2> >::_S_last_request' /usr/bin/ld: .../libstdc++-v3/src/.libs/libstdc++.so: undefined reference to `__gnu_cxx::bitmap_allocator<std::_Sp_counted_ptr_inplace<std::__future_base::_State_baseV2, std::allocator<std::__future_base::_State_baseV2>, (__gnu_cxx::_Lock_policy)2> >::_S_mem_blocks'
