[llvm-bugs] [Bug 40755] New: Compile error occurs when -stdlib=libc++ is specified

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40755

            Bug ID: 40755
           Summary: Compile error occurs when -stdlib=libc++ is specified
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ueno.masakazu at jp.fujitsu.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

If -stdlib=libc++ is specified, a compiler error occurs because there is a
const qualification bug.

* source code
#include <string.h>
#include <stdio.h>
#include <map>

using namespace std;

class test_class {
public:
  int i;
  map<string, int> map_a;

public:
  bool is_bbb(int t) {
    static map<const string, int>::iterator it;
    if (t == 0) {
      it = map_a.begin();
      return true;
    }
    return false;
  }
};

* error message
$ clang++ -O3 args_parser.cpp -c -stdlib=libc++
args_parser.cpp:16:10: error: no viable overloaded '='
      it = map_a.begin();
      ~~ ^ ~~~~~~~~~~~~~
/opt/llvm/svn-trunk/install/bin/../include/c++/v1/map:776:28: note: candidate
function (the implicit copy assignment operator) not viable: no known
conversion from '__map_iterator<__tree_iterator<__value_type<basic_string<...>,
[...]>, std::__1::__tree<std::__1::__value_type<std::__1::basic_string<char,
      std::__1::char_traits<char>, std::__1::allocator<char> >, int>,
std::__1::__map_value_compare<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >,
std::__1::__value_type<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >, int>,
      std::__1::less<std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > >, true>,
std::__1::allocator<std::__1::__value_type<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >, int> >
>::__node_pointer, [...]>>' to 'const
      __map_iterator<__tree_iterator<__value_type<const basic_string<...>,
[...]>, std::__1::__tree_node<std::__1::__value_type<const
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >, int>, void *> *, [...]>>' for 1st argument
class _LIBCPP_TEMPLATE_VIS __map_iterator
                           ^
/opt/llvm/svn-trunk/install/bin/../include/c++/v1/map:776:28: note: candidate
function (the implicit move assignment operator) not viable: no known
conversion from '__map_iterator<__tree_iterator<__value_type<basic_string<...>,
[...]>, std::__1::__tree<std::__1::__value_type<std::__1::basic_string<char,
      std::__1::char_traits<char>, std::__1::allocator<char> >, int>,
std::__1::__map_value_compare<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >,
std::__1::__value_type<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >, int>,
      std::__1::less<std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > >, true>,
std::__1::allocator<std::__1::__value_type<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >, int> >
>::__node_pointer, [...]>>' to
      '__map_iterator<__tree_iterator<__value_type<const basic_string<...>,
[...]>, std::__1::__tree_node<std::__1::__value_type<const
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >, int>, void *> *, [...]>>' for 1st argument
1 error generated.
$

* Note
There is no problem if -stdlib=libstdc++ option is valid.
$ clang++ -O3 aaa.cpp -c -stdlib=libstdc++
$

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