[LLVMbugs] [Bug 19414] New: MS ABI: Layout incompatibility for aligned bitfield following normal bitfield of same size class

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19414

            Bug ID: 19414
           Summary: MS ABI: Layout incompatibility for aligned bitfield
                    following normal bitfield of same size class
           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 {
  short : 4;
  __declspec(align(16)) short : 4;
};
int main() {
  printf("sizeof(A): %Iu\n", sizeof(A));
}

msvc:
sizeof(A): 2

clang:
sizeof(A): 16

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