用于进行gcc测试

				/* PR c/19978 : Test for duplicated warnings (unary operators).  */				/* { dg-do compile } */				/* { dg-options "-std=c99 -Woverflow" } */								#include 								int 				g (void)				{				  return - - - - -INT_MIN; /* { dg-bogus "integer overflow in expression.*integer overflow in expression" } */				  /* { dg-warning "integer overflow in expression" "" { target *-*-* } 10 } */				}