[LLVMbugs] [Bug 18474] New: [-cxx-abi microsoft] size calculation is wrong for aligned bitfield inside pragma-pack

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18474

            Bug ID: 18474
           Summary: [-cxx-abi microsoft] size calculation is wrong for
                    aligned bitfield inside pragma-pack
           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

extern "C" int printf(const char *fmt, ...);
struct A {};
struct B {};
#pragma pack(push, 1)
struct __declspec(align(4)) C : A, B {
  __declspec(align(8192)) int : 3;
};
#pragma pack(pop)
int main() { printf("sizeof(C): %u\n", sizeof(C)); }

MSVC gives:
sizeof(C): 8196

clang gives:
sizeof(C): 8

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