[LLVMbugs] [Bug 7138] New: clang incorrectly double-instantiates friend of template class

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=7138

           Summary: clang incorrectly double-instantiates friend of
                    template class
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: chris at bubblescope.net
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


Created an attachment (id=4890)
 --> (http://llvm.org/bugs/attachment.cgi?id=4890)
Friend example

The attached code is reduced from a boost test which should fail, but passes in
clang++.

This technique is used to stop inconsistencies in boost::units, so the
compile-invalid can lead to invalid code (from the library point of view) being
compiled.


Problematic code:


template<class > struct base_dimension
{
  friend int boost_units_is_registered( )
  {
  }
};

struct int1 : base_dimension<int>
{};
struct dim2 : base_dimension<dim2>
{};

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