[LLVMbugs] [Bug 18168] New: [-cxx-abi microsoft] clang miscalculates size of record layout involving zero-sized bases

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18168

            Bug ID: 18168
           Summary: [-cxx-abi microsoft] clang miscalculates size of
                    record layout involving zero-sized 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

#if defined(__clang__) || defined(__GNUC__)
typedef __SIZE_TYPE__ size_t;
#endif
extern "C" int printf(const char *fmt, ...);
inline void *operator new(size_t, void *pv) {}
struct ClassName0 {
  ClassName0() {}
};
struct ClassName1 {
  ClassName1() {}
};
struct ClassName2 : public ClassName1 {
  int ClassName2FieldName2;
  ClassName2() {}
};
struct ClassName3 : public ClassName2,
                    public virtual ClassName0,
                    public ClassName1 {
  ClassName3() {}
};
static void test_layout(const char *class_name, size_t size_of_class,
                        size_t align_of_class) {
  printf("   sizeof(%s): %Iu\n", class_name, size_of_class);
}
template <typename Class>
static void init_mem() {}
#define test(Class) \
  init_mem<Class>(), test_layout(#Class, sizeof(Class), __alignof(Class))
int main() { test(ClassName3); }

msvc:
sizeof(ClassName3): 16

clang:
sizeof(ClassName3): 8

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