Why Clang at Coliru can't compile vector::push_back?

Question

See it here. The program is very mundane, like that:

#include <vector>

std::vector<int> bombs;

int main()
{
    bombs.push_back(42); // compile errors
}

The diagnostics do not make much sense to me:

In file included from main.cpp:1:

In file included from /usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/vector:60:

In file included from /usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/bits/stl_algobase.h:64:

In file included from /usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/bits/stl_pair.h:59:

In file included from /usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/bits/move.h:55:

/usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/type_traits:1061:48: error: '_Tp' does not refer to a value
  : public __bool_constant<__is_assignable(_Tp, _Up)>
                                           ^
/usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/type_traits:1059:21: note: declared here
template<typename _Tp, typename _Up>
                  ^
/usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/type_traits:1061:53: error: _Up does not refer to a value
  : public __bool_constant<__is_assignable(_Tp, _Up)>
                                                ^
/usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/type_traits:1059:35: note: declared here
template<typename _Tp, typename _Up>
                                ^
/usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/type_traits:1062:5: error: expected class name
{ };
^
In file included from main.cpp:1:

In file included from /usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/vector:63:

/usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/bits/stl_uninitialized.h:128:70: error: no member named value in std::is_assignable<int &, int &&>
  const bool __assignable = is_assignable<_RefType2, _RefType1>::value;
                            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
/usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/bits/stl_uninitialized.h:289:19: note: in instantiation of function template specialization std::uninitialized_copy<std::move_iterator<int *>, int *> requested here
{ return std::uninitialized_copy(__first, __last, __result); }
              ^
/usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/bits/stl_uninitialized.h:310:19: note: in instantiation of function template specialization std::__uninitialized_copy_a<std::move_iterator<int *>, int *, int> requested here
  return std::__uninitialized_copy_a
              ^
/usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/bits/vector.tcc:446:13: note: in instantiation of function template specialization std::__uninitialized_move_if_noexcept_a<int *, int *, std::allocator<int> > requested here
        = std::__uninitialized_move_if_noexcept_a
               ^
/usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/bits/vector.tcc:109:4: note: in instantiation of function template specialization std::vector<int, std::allocator<int> >::_M_realloc_insert<int> requested here
      _M_realloc_insert(end(), std::forward<_Args>(__args)...);
      ^
/usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../include/c++/8.1.0/bits/stl_vector.h:1091:9: note: in instantiation of function template specialization std::vector<int, std::allocator<int> >::emplace_back<int> requested here
  { emplace_back(std::move(__x)); }
    ^
main.cpp:7:9: note: in instantiation of member function std::vector<int, std::allocator<int> >::push_back requested here
bombs.push_back(42);
      ^
4 errors generated.

Same with g++ compiles without any issues. I can't really look at the library headers that Clang at Coliru includes to program for to figure it out myself. Does anyone have any ideas what is wrong and how to overcome the issue?

Works fine with clang6, so probably some bug caused by using the old clang version with the newer libstdc++ 8.1. — Baum mit Augen♦
Probable incompatibility between a newer libstdc++ and a very old clang. — Rakete1111
@StackedCrooked Thanks! But classical Hello World does not still link with Clang: coliru.stacked-crooked.com/a/5518c6dd74de1e6f — Öö Tiib
@ÖöTiib That one in particular will compile if you use clang++ instead of clang. — Justin Time - Reinstate Monica

Paul Sanders Paul Sanders · Accepted Answer · 2018-06-16T21:40:11

I 100% wouldn't worry about this, it's just some weirdness at Coliru. It works perfectly at Wandbox, right back to Clang 3.1

According to the donations page, you can probably report this problem to [email address redacted].

Why Clang at Coliru can't compile vector::push_back?

1 Answers