[LLVMbugs] [Bug 19399] New: MS ABI: Layout of class hierarchy with overridden methods and virtual inheritance is wrong

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19399

            Bug ID: 19399
           Summary: MS ABI: Layout of class hierarchy with overridden
                    methods and virtual inheritance is wrong
           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 {
    virtual void fun() {}
};
struct B: public A {};
struct C: public virtual A {
    virtual void fun() {}
    C() {}
};
struct D: public virtual C, public virtual B {};
int main() {
    printf("sizeof(D): %Iu\n", sizeof(D));
}

32-bit:
clang gives D size 24, msvc gives it size 20

64-bit:
clang gives D size 48, msvc gives it size 40

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