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  1.  
  2. #include <stdio.h>
  4. typedef union
  5. {
  6. unsigned short M;
  7. struct
  8. {
  9. unsigned short :15;
  10. unsigned short c1:1;
  11. }S;
  12. }k_o;
  14. typedef union __attribute__((packed, scalar_storage_order("big-endian")))
  15. {
  16. unsigned short M;
  17. struct __attribute__((packed, scalar_storage_order("big-endian")))
  18. {
  19. unsigned short :15;
  21. unsigned short c1:1;
  22. }S;
  23. }k_o_gcc;
  25. int main()
  26. {
  27. k_o ko = { .M=0 };
  28. ko.S.c1 = 1;
  29. printf("old struct = %d\n", ko.M);
  30. k_o_gcc kogcc = { .M=0 };
  31. kogcc.S.c1 = 1;
  32. printf("new struct = %d\n", kogcc.M);
  33. return 0;
  34. }
  35.  
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