[LLVMbugs] [Bug 18434] New: [-cxx-abi microsoft] bad layout involving empty struct field and empty virtual bases

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18434

            Bug ID: 18434
           Summary: [-cxx-abi microsoft] bad layout involving empty struct
                    field and empty virtual bases
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: david.majnemer at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

given:
#if defined(__clang__) || defined(__GNUC__)
typedef __SIZE_TYPE__ size_t;
#endif
extern "C" int printf(const char *fmt, ...);
static char buffer[419430400];
inline void *operator new(size_t, void *pv) { return pv; }
struct A {
  char Field;
  A() { printf("Field: %d\n", (int)&Field - (int)buffer); }                     
};
struct B {};
struct C : A {};
struct D : virtual C {
  struct {} DField;
};
struct E : virtual D, virtual B, virtual A {};

int main() { new (buffer) E; }

MSVC gives:
Field: 4
Field: 16

clang gives:
Field: 4
Field: 20

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