File: main.c

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#define STATIC_ASSERT(condition) \
  int some_array##__LINE__[(condition) ? 1 : -1];

struct S1
{
  struct sub
  {
    int other : 1;
  } whatnot;

  int my_bit : 1;

  const my_bit2 : 2; // no type!
};

STATIC_ASSERT(sizeof(struct S1)==sizeof(int)*2);

struct S2
{
  char my_bit : 1;
};

STATIC_ASSERT(sizeof(struct S2)==sizeof(char));

struct S3
{
  char my_bit : 1;
  int : 0; // zero width, causes padding to alignment of int
  char other;
  int whatnot;
};

STATIC_ASSERT(sizeof(struct S3)==sizeof(int)+sizeof(int)+sizeof(int));

int main()
{
}