[LLVMbugs] [Bug 18702] New: MS ABI: insufficient padding inserted between zero sized virtual bases in a record with a bitfield

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18702

            Bug ID: 18702
           Summary: MS ABI: insufficient padding inserted between zero
                    sized virtual bases in a record with a bitfield
           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

consider:
extern "C" int printf(const char *, ...);
struct A {};
struct B {};
struct C : virtual A, virtual B {
  int Field : 3;
  C() {
    printf("A: %Iu\n", (char *)(A *)this - (char *)this);
    printf("B: %Iu\n", (char *)(B *)this - (char *)this);
  }
};

int main() { C(); printf("sizeof(C): %Iu\n", sizeof(C)); }

clang gives us:
A: 12
B: 20
sizeof(C): 20

msvc gives:
A: 12
B: 24
sizeof(C): 24

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