[LLVMbugs] [Bug 7737] New: [c++] clang++ throws compile error on never used template function that calls a protected function

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=7737

           Summary: [c++] clang++ throws compile error on never used
                    template function that calls a protected function
           Product: clang
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: mike.jackson at bluequartz.net
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


// BEGIN CODE
class Foo
{
public:
  int pub_function() {return 1;}
  Foo() {}
  virtual ~Foo() {};
protected:
  int protected_function() { return 2;}
};

template<typename T>
void outside_function(Foo* self)
{
  self->protected_function();
}

int main (int argc, char const *argv[])
{
  Foo* f = new Foo;
  delete f;
  return 0;
}
// END CODE

GCC compiles this code just fine where as clang throws a compile error. Note
that the function "outside_function" is never actually used. This type of code
is currently present in the vtkTIFFReader.cxx of the VTK.org code base.

The clang compile error is:
528:[mjackson at ferb:Build]$ clang++ ~/Desktop/VTKBug.cpp -o
~/Desktop/VTKBug-clang
/Users/mjackson/Desktop/VTKBug.cpp:14:9: error: 'protected_function' is a
protected member of 'Foo'
  self->protected_function();
        ^
/Users/mjackson/Desktop/VTKBug.cpp:8:7: note: declared protected here
  int protected_function() { return 2;}
      ^
1 error generated.

530:[mjackson at ferb:Build]$ clang --version
clang version 2.8 (trunk 109582)
Target: x86_64-apple-darwin9
Thread model: posix

Not really sure if this is a clang bug or really a bug in the vtkTIFFReader
code. I am unfamiliar with the spec on this.

Thanks
Mike Jackson
Principal Software Engineer
BlueQuartz Software
www.bluequartz.net

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