linux下编程用 编译软件

				/* PR optimization/12198								   This was a miscompilation of a switch expressions because				   the "Case Ranges" extension wasn't handled in tree-cfg.c.  */								/* { dg-do compile } */				/* { dg-options "-O -fdump-tree-optimized" } */								extern void abort (void);				extern void exit (int);								int main() 				{ 				   int i; 				   i = 2; 				   switch (i) 				      { 				      case 1 ... 5: 				         goto L1; 				      default: 				         abort (); 				         goto L1; 				      } 				   L1: 				   exit(0); 				}								/* The abort() call clearly is unreachable.  */				/* { dg-final { scan-tree-dump-times "abort" 0 "optimized"} } */				/* { dg-final { cleanup-tree-dump "optimized" } } */