https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100226
Bug ID: 100226 Summary: [11/12 Regression] c++/11/bits/stl_tree.h:770:8: error: static assertion failed: comparison object must be invocable as const Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: marxin at gcc dot gnu.org Target Milestone: --- It's taken from ncurses package, where the package can be built with GCC 10. It's likely caused by changes in libstdc++ in header files. I can build g++-10 -E && g++-11 ncurses.ii, but g++-11 ... fails. It's also very difficult to decode the error message. $ g++ ncurses.ii -c In file included from /usr/include/c++/11/set:60, from /usr/include/zypp/Arch.h:17, from /usr/include/zypp/sat/Solvable.h:22, from /usr/include/zypp/sat/SolvIterMixin.h:21, from /usr/include/zypp/sat/LocaleSupport.h:18, from /home/abuild/rpmbuild/BUILD/libyui-4.2.1/libyui-ncurses-pkg/src/NCPkgFilterPattern.cc:44: /usr/include/c++/11/bits/stl_tree.h: In instantiation of ‘static const _Key& std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_S_key(std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_Const_Link_type) [with _Key = std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >; _Val = std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >; _KeyOfValue = std::_Identity<std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > >; _Compare = paircmp; _Alloc = std::allocator<std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > >; std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_Const_Link_type = const std::_Rb_tree_node<std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > >*]’: /usr/include/c++/11/bits/stl_tree.h:2069:47: required from ‘std::pair<std::_Rb_tree_node_base*, std::_Rb_tree_node_base*> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_get_insert_unique_pos(const key_type&) [with _Key = std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >; _Val = std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >; _KeyOfValue = std::_Identity<std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > >; _Compare = paircmp; _Alloc = std::allocator<std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > >; std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::key_type = std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >]’ /usr/include/c++/11/bits/stl_tree.h:2122:4: required from ‘std::pair<std::_Rb_tree_iterator<_Val>, bool> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_unique(_Arg&&) [with _Arg = std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >; _Key = std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >; _Val = std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >; _KeyOfValue = std::_Identity<std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > >; _Compare = paircmp; _Alloc = std::allocator<std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > >]’ /usr/include/c++/11/bits/stl_set.h:521:25: required from ‘std::pair<typename std::_Rb_tree<_Key, _Key, std::_Identity<_Tp>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator, bool> std::set<_Key, _Compare, _Alloc>::insert(std::set<_Key, _Compare, _Alloc>::value_type&&) [with _Key = std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >; _Compare = paircmp; _Alloc = std::allocator<std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > >; typename std::_Rb_tree<_Key, _Key, std::_Identity<_Tp>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator = std::_Rb_tree<std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >, std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >, std::_Identity<std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > >, paircmp, std::allocator<std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > > >::const_iterator; typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other = std::allocator<std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > >; typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key> = __gnu_cxx::__alloc_traits<std::allocator<std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > >, std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > >::rebind<std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > >; typename _Alloc::value_type = std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >; std::set<_Key, _Compare, _Alloc>::value_type = std::pair<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >]’ /home/abuild/rpmbuild/BUILD/libyui-4.2.1/libyui-ncurses-pkg/src/NCPkgFilterPattern.cc:343:28: required from here /usr/include/c++/11/bits/stl_tree.h:770:8: error: static assertion failed: comparison object must be invocable as const 770 | | ^ /usr/include/c++/11/bits/stl_tree.h:770:8: note: ‘std::is_invocable_v<const paircmp&, const std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >&, const std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >&>’ evaluates to false