linux下编程用 编译软件

				/* { dg-do compile { target i?86-*-* sparc*-*-* x86_64-*-* } } */				/* { dg-options "-O2" } */								extern void abort (void);				extern void exit (int);								typedef enum { false, true } __attribute__ ((packed)) boolean;				typedef struct {				  enum {				    A0 = 0, A1 = 1, A2 = 2				  } __attribute__((packed)) A:3;				  enum {				    B0 = 0, B1 = 1, B2 = 2				  } __attribute__((packed)) B:3;				  boolean C:1;				  boolean D:1;				  unsigned char :8;				} foo;				foo x = { A2, B1, false, true };								int main(void)				{				  if (sizeof (foo) != 2 || __alignof__ (foo) != 1)				    abort ();								  exit (0);				}