[LLVMbugs] [Bug 19181] New: MS ABI: Layout of derived class with empty base is wrong

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19181

            Bug ID: 19181
           Summary: MS ABI: Layout of derived class with empty base is
                    wrong
           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

consider:
extern "C" int printf(const char *, ...);
static char buffer[419430400];
inline void *operator new(size_t, void *pv) { return pv; }
struct A {};
struct B : public A {
  int Fiel1;
  B() {
    printf("Fiel1 : %lu\n", ((char *)&Fiel1 - (char *)&buffer));
  }
};
struct C {
  int Fiel2;
};
struct D : public A, public C {
  int Fiel3;
};
struct E : public D, public B {
  int Fiel4;
};

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

MSVC gives us:
Fiel1 : 8

clang gives us:
Fiel1 : 12

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