File: mms-bitfields.c

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llvm-toolchain-21 1%3A21.1.6-3
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// RUN: %clang_cc1 -mms-bitfields -fsyntax-only -verify -triple x86_64-apple-darwin9 %s
// RUN: %clang_cc1 -mms-bitfields -fsyntax-only -Wms-bitfield-padding -verify=checkms -triple x86_64-apple-darwin9 %s

// expected-no-diagnostics

// The -mms-bitfields commandline parameter should behave the same
// as the ms_struct attribute.
struct
{
   int a : 1; // #a
   short b : 1;
   // checkms-warning@-1 {{bit-field 'b' of type 'short' has a different storage size than the preceding bit-field (2 vs 4 bytes) and will not be packed under the Microsoft ABI}}
   // checkms-note@#a {{preceding bit-field 'a' declared here with type 'int'}}
} t;

// MS pads out bitfields between different types.
static int arr[(sizeof(t) == 8) ? 1 : -1];

#pragma pack (push,1)

typedef unsigned int UINT32;

struct Inner {
  UINT32    A    :  1;
  UINT32    B    :  1;
  UINT32    C    :  1;
  UINT32    D    : 30;
} Inner;

#pragma pack (pop)

static int arr2[(sizeof(Inner) == 8) ? 1 : -1];