[LLVMbugs] [Bug 8789] New: Instantiating class template with friend declaration of C::f() hides in-line definition of C::f().

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8789

           Summary: Instantiating class template with friend declaration
                    of C::f() hides in-line definition of C::f().
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: hans at chromium.org
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


Compiling and linking the following code with Clang built from trunk r121764
fails:

template <typename T>
class ClassTemplate {
  friend void T::func();
};

class C {
 public:
  void func() {
    ClassTemplate<C> ct;
  }
};

int main() {
  C c;
  c.func();
}


$ clang++ /tmp/c.cc
/usr/bin/ld: /tmp/cc-QB69fY.o: in function main:/tmp/c.cc(.text+0x14): error:
undefined reference to 'C::func()'
clang: error: linker command failed with exit code 1 (use -v to see invocation)


If C::func() is defined out-of-line, it works.

It seems like instantiating ClassTemplate<> with its friend declaration of
T::func() somehow makes the in-line definition of C::func() disappear.

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