[Bug c++/78349] New: function returning std::basic_string<char> missing [abi:cxx11] tag

[thighland at vectranetworks dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78349

            Bug ID: 78349
           Summary: function returning std::basic_string<char> missing
                    [abi:cxx11] tag
           Product: gcc
           Version: 5.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: thighland at vectranetworks dot com
  Target Milestone: ---

test.cc:
#include <string>

template <class T>
class foo {
    public:
    std::basic_string<T> bar() {
        return "";
    }
};

foo<char> baz;
auto y = baz.bar();

Compiler command:
g++-5 -c -std=c++14 test.cc -o test.o

Result:
nm test.o |c++filt| grep bar
0000000000000000 W foo<char>::bar()

Expected:
nm test.o |c++filt| grep bar
0000000000000000 W foo<char>::bar[abi:cxx11]()