[cfe-dev] libc++ problem with clang trunk

[Howard Hinnant]

Fixed in r194154.

Howard

On Nov 6, 2013, at 7:40 AM, İsmail Dönmez <ismail at donmez.ws> wrote:

> Hi,
> 
> Testcase stolen from #llvm channel, using clang r194134 on Linux x86-64.
> This is also reported as http://llvm.org/bugs/show_bug.cgi?id=17826
> 
> [/havana/t/clang]> cat test.cpp 
> #include <memory>
> using namespace std;
>  
> class test {
>         struct private_tag {};
> public:
>         test(private_tag) {}
>         static shared_ptr<test> make_test() {
>                 return make_shared<test>(private_tag());
>         }
> };
>  
> int main()
> {
>         auto t = test::make_test();
> }
> 
> 
> [/havana/t/clang]> clang++ -std=c++11 -stdlib=libc++  test.cpp
> In file included from test.cpp:1:
> In file included from /usr/include/c++/v1/memory:603:
> /usr/include/c++/v1/tuple:267:11: error: rvalue reference to type 'test::private_tag' cannot bind to lvalue of type
>       'test::private_tag'
>         : value(__t.get())
>           ^     ~~~~~~~~~
> /usr/include/c++/v1/tuple:385:8: note: in instantiation of member function 'std::__1::__tuple_leaf<0, test::private_tag &&,
>       false>::__tuple_leaf' requested here
> struct __tuple_impl<__tuple_indices<_Indx...>, _Tp...>
>        ^
> /usr/include/c++/v1/memory:4290:26: note: in instantiation of function template specialization
>       'std::__1::__shared_ptr_emplace<test, std::__1::allocator<test> >::__shared_ptr_emplace<test::private_tag>' requested
>       here
>     ::new(__hold2.get()) _CntrlBlk(__a2, _VSTD::forward<_Args>(__args)...);
>                          ^
> /usr/include/c++/v1/memory:4649:29: note: in instantiation of function template specialization
>       'std::__1::shared_ptr<test>::make_shared<test::private_tag>' requested here
>     return shared_ptr<_Tp>::make_shared(_VSTD::forward<_Args>(__args)...);
>                             ^
> test.cpp:9:24: note: in instantiation of function template specialization 'std::__1::make_shared<test, test::private_tag>'
>       requested here
>                 return make_shared<test>(private_tag());
>                        ^
> In file included from test.cpp:1:
> In file included from /usr/include/c++/v1/memory:603:
> /usr/include/c++/v1/tuple:268:10: error: static_assert failed "Can not copy a tuple with rvalue reference member"
>         {static_assert(!is_rvalue_reference<_Hp>::value, "Can not copy a tuple with rvalue reference member");}
>          ^             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 2 errors generated.
> 
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