[LLVMbugs] [Bug 10666] New: definition not emitted for friend operator overload inside instantiated template class

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10666

           Summary: definition not emitted for friend operator overload
                    inside instantiated template class
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: nlewycky at google.com
                CC: llvmbugs at cs.uiuc.edu


This testcase involves templates, friends and operator overloading:

  struct Empty {};

  template<typename T> struct Helper {
    void Method(const Helper<T> &bbox1) {
      Helper<double> d;
    }

    friend void operator<<(Empty &, const Helper<T> &) {}
  };

  void test(Helper<double> helper) {
    Empty os;
    os << helper;
  }

Clang does not emit the definition of operator<< (_ZlsR5EmptyRK6HelperIdE to be
specific) even though it emits a call to it.

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