[LLVMbugs] [Bug 21355] New: Another "Global is marked as dllimport, but not external" assert, for VTables

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21355

            Bug ID: 21355
           Summary: Another "Global is marked as dllimport, but not
                    external" assert, for VTables
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: dario.domizioli at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Yet another case of problems with dllimport (see also fixed bug 13450 and
20792).

// ---------------------------------
class __declspec(dllimport) C {
public:
  virtual ~C();
};

C::~C() {}
// ---------------------------------

Compile with:
  clang -c --target=x86_64-windows-gnu test.cpp
I have seen this on r219922.

When compiled, this generates the warning that the 'dllimport' attribute is
dropped for the destructor. However, this must have some effect on how the
vtable is generated, because then we get the "Global is marked as dllimport,
but not external" assertion, and the reported global is the vtable for C.

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