[LLVMbugs] [Bug 18215] New: [-cxx-abi microsoft] Bad layout for hierarchy involving empty bases and non-empty base with virtual method

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18215

            Bug ID: 18215
           Summary: [-cxx-abi microsoft] Bad layout for hierarchy
                    involving empty bases and non-empty base with virtual
                    method
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            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

#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 ClassName0 {
  bool ClassName0FieldName0;
  ClassName0() {
    printf(
        "ClassName0FieldName0 : %llu\n",
        (unsigned long long)((size_t) & ClassName0FieldName0 -
(size_t)buffer));
  }
};
struct ClassName1 : public ClassName0 {
  virtual void ClassName1Method() {}
};
struct ClassName2 : public ClassName1, public ClassName0 {
  virtual void ClassName2Method() {}
};
struct ClassName3 : public ClassName0, public ClassName1, public ClassName2 {};
static void test_layout(const char *class_name, size_t size_of_class,
                        size_t align_of_class) {}
template <typename Class>
static void init_mem() {
  new (buffer) Class;
}
#define test(Class) \
  init_mem<Class>(), test_layout(#Class, sizeof(Class), __alignof(Class))
int main() { test(ClassName3); }

clang:
ClassName0FieldName0 : 8
ClassName0FieldName0 : 4
ClassName0FieldName0 : 16
ClassName0FieldName0 : 20

msvc:
ClassName0FieldName0 : 20
ClassName0FieldName0 : 4
ClassName0FieldName0 : 12
ClassName0FieldName0 : 16

This was run on clang r197060.

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