用于进行gcc测试

				/* Test for diagnostics for implicit conversions between integer types				   These tests come from gcc/testsuite/gcc.dg/overflow-warn-2.c  */								/* { dg-do compile } */				/* { dg-options "-std=c99 -fsigned-char -Wconversion" } */								#include 								void fsc (signed char sc);				void fuc (unsigned char uc);				unsigned fui (unsigned int  ui);				void fsi (signed int ui);								void h (int x)				{				  unsigned int ui = 3;				  int   si = 3;				  unsigned char uc = 3;				  signed char   sc = 3;								  uc = ui; /* { dg-warning "conversion" } */				  uc = si; /* { dg-warning "conversion" } */				  sc = ui; /* { dg-warning "conversion" } */				  sc = si; /* { dg-warning "conversion" } */				  fuc (ui); /* { dg-warning "conversion" } */				  fuc (si); /* { dg-warning "conversion" } */				  fsc (ui); /* { dg-warning "conversion" } */				  fsc (si); /* { dg-warning "conversion" } */								  fsi (si);				  fui (ui);				  fsi (uc);				  si = uc;				  fui (uc);				  ui = uc;				  fui ('A');				  ui = 'A';				  fsi ('A');				  si = 'A';				  fuc ('A');				  uc = 'A';								  uc = x ? 1U : -1; /* { dg-warning "conversion" } */				  /* { dg-warning "negative integer implicitly converted to unsigned type" "" { target *-*-* } 43 } */				  uc = x ? SCHAR_MIN : 1U; /* { dg-warning "conversion" } */				  /* { dg-warning "negative integer implicitly converted to unsigned type" "" { target *-*-* } 45 } */				  uc = x ? 1 : -1; /* { dg-warning "conversion" } */				  uc = x ? SCHAR_MIN : 1; /* { dg-warning "conversion" } */				  ui = x ? 1U : -1; /* { dg-warning "negative integer implicitly converted to unsigned type" } */				  ui = x ? INT_MIN : 1U; /* { dg-warning "negative integer implicitly converted to unsigned type" } */				  ui = ui ? SCHAR_MIN : 1U; /* { dg-warning "negative integer implicitly converted to unsigned type" } */				  ui = 1U * -1; /* { dg-warning "negative integer implicitly converted to unsigned type" } */				  ui = ui + INT_MIN; /* { dg-warning "negative integer implicitly converted to unsigned type" } */				  ui = x ? 1 : -1; /* { dg-warning "conversion" } */				  ui = ui ? SCHAR_MIN : 1; /* { dg-warning "conversion" } */								  fuc (-1); /* { dg-warning "negative integer implicitly converted to unsigned type" } */				  uc = -1;  /* { dg-warning "negative integer implicitly converted to unsigned type" } */				  fui (-1); /* { dg-warning "negative integer implicitly converted to unsigned type" } */				  ui = -1; /* { dg-warning "negative integer implicitly converted to unsigned type" } */				  fuc ('\xa0'); /* { dg-warning "negative integer implicitly converted to unsigned type" } */				  uc = '\xa0'; /* { dg-warning "negative integer implicitly converted to unsigned type" } */				  fui ('\xa0');/* { dg-warning "negative integer implicitly converted to unsigned type" } */				  ui = '\xa0'; /* { dg-warning "negative integer implicitly converted to unsigned type" } */				  fsi (0x80000000); /* { dg-warning "conversion" } */				  si = 0x80000000;  /* { dg-warning "conversion" } */												  fsi (UINT_MAX - 1);  /* { dg-warning "conversion" } */				  si = UINT_MAX - 1;   /* { dg-warning "conversion" } */				  fsi (UINT_MAX - 1U); /* { dg-warning "conversion" } */				  si = UINT_MAX - 1U;  /* { dg-warning "conversion" } */				  fsi (UINT_MAX/3U);				  si = UINT_MAX/3U;				  fsi (UINT_MAX/3);				  si = UINT_MAX/3;				  fui (UINT_MAX - 1);				  ui = UINT_MAX - 1;								  uc = (unsigned char) -1;				  ui = -1 * (1 * -1);				  ui = (unsigned) -1;								  fsc (uc); /* { dg-warning "conversion" } */				  sc = uc;  /* { dg-warning "conversion" } */				  fuc (sc); /* { dg-warning "conversion" } */				  uc = sc;  /* { dg-warning "conversion" } */				  fsi (ui); /* { dg-warning "conversion" } */				  si = ui;  /* { dg-warning "conversion" } */				  fui (si); /* { dg-warning "conversion" } */ 				  ui = si;  /* { dg-warning "conversion" } */ 				  fui (sc); /* { dg-warning "conversion" } */				  ui = sc;  /* { dg-warning "conversion" } */				}								unsigned fui (unsigned a) { return a + -1; } /* { dg-warning "negative integer implicitly converted to unsigned type" } */