[LLVMbugs] [Bug 12104] New: Missing definition for static const member

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12104

             Bug #: 12104
           Summary: Missing definition for static const member
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++0x
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: rafael.espindola at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


given
------------------------------------------
template <int dimm> struct Patch {
  unsigned int patch_index;
  Patch ();
  static const unsigned int no_neighbor = -1;
};

#ifdef FOO
void foobar(const unsigned &y);
void build_patches () {
  foobar(Patch<1>::no_neighbor);
}
#else
template <int dim>
const unsigned int Patch<dim>::no_neighbor;
template <int dim>
Patch<dim>::Patch () : patch_index(no_neighbor) {
}
template struct Patch<1>;
#endif
----------------------------------------------

both clang and gcc in c++11 mode will produce an undefined symbol with -DFOO.
Without it, gcc produces a definition but clang doesn't. To make things really
strange, commenting the Patch constructor definition causes clang to emit the
symbol (_ZN5PatchILi1EE11no_neighborE).

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