[LLVMbugs] [Bug 23549] New: [MS ABI] Clang doesn't generate local vftables with dllimport

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23549

            Bug ID: 23549
           Summary: [MS ABI] Clang doesn't generate local vftables with
                    dllimport
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: david.majnemer at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

consider:
struct _declspec(dllimport) A {
  A()
  virtual ~A();
};

A *f() { return new A();}

MSVC generates:
This calls 'operator new' and the imported A constructor.  However, it also
overwrites the VFPtr with a so-called "local vftable". I suspect this is to
support overriding the global operator new and delete.

More information is available here:
https://groups.google.com/d/msg/microsoft.public.vc.language/atSh_2VSc2w/EgJ3r_7OzVUJ

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