[llvm-bugs] [Bug 26431] New: i/o stream of based enum gives ambiguity error

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26431

            Bug ID: 26431
           Summary: i/o stream of based enum gives ambiguity error
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ivan at millcomputing.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

This source:
#include    <iostream>
enum foo : short  {};
extern foo bar;
int main(int argc, char** argv) {
    std::cerr << bar;
    return 0;
    }
when compiled with:
s8:~/mill/specializer$ clang  -std=c++11 -v
clang version 3.7.0 (branches/release_37 242873)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/4.9.2
Selected GCC installation: /usr/lib/gcc/x86_64-redhat-linux/4.9.2
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64

gives this diagnostic:

test.cc:6:12: error: use of overloaded operator '<<' is ambiguous (with operand
      types 'ostream' (aka 'basic_ostream<char>') and 'foo')
        std::cerr << bar;
        ~~~~~~~~~ ^  ~~~
/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../include/c++/4.9.2/ostream:178:7:
note:
      candidate function
      operator<<(short __n);
      ^
/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../include/c++/4.9.2/ostream:189:7:
note:
      candidate function
      operator<<(int __n);
      ^
/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../include/c++/4.9.2/ostream:166:7:
note:
      candidate function
      operator<<(long __n)
      ^
/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../include/c++/4.9.2/ostream:170:7:
note:
      candidate function
      operator<<(unsigned long __n)
      ^
/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../include/c++/4.9.2/ostream:174:7:
note:
      candidate function
      operator<<(bool __n)
      ^
/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../include/c++/4.9.2/ostream:181:7:
note:
      candidate function
      operator<<(unsigned short __n)
      ^
/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../include/c++/4.9.2/ostream:192:7:
note:
      candidate function
      operator<<(unsigned int __n)
      ^
/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../include/c++/4.9.2/ostream:201:7:
note:
      candidate function
      operator<<(long long __n)
      ^
/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../include/c++/4.9.2/ostream:205:7:
note:
      candidate function
      operator<<(unsigned long long __n)
      ^
/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../include/c++/4.9.2/ostream:220:7:
note:
      candidate function
      operator<<(double __f)
      ^
/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../include/c++/4.9.2/ostream:224:7:
note:
      candidate function
      operator<<(float __f)
      ^
/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../include/c++/4.9.2/ostream:232:7:
note:
      candidate function
      operator<<(long double __f)
      ^
/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../include/c++/4.9.2/ostream:482:5:
note:
      candidate function [with _Traits = std::char_traits<char>]
    operator<<(basic_ostream<char, _Traits>& __out, char __c)
    ^
/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../include/c++/4.9.2/ostream:476:5:
note:
      candidate function [with _CharT = char, _Traits = std::char_traits<char>]
    operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
    ^
/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../include/c++/4.9.2/ostream:488:5:
note:
      candidate function [with _Traits = std::char_traits<char>]
    operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
    ^
/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../include/c++/4.9.2/ostream:493:5:
note:
      candidate function [with _Traits = std::char_traits<char>]
    operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
    ^
1 error generated.

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