linux下编程用 编译软件

				/* Test for diagnostics for constant overflow.  */				/* Origin: Joseph Myers  */				/* { dg-do compile } */				/* { dg-options "-std=c99" } */								#include 								enum e {				  E0 = INT_MAX,				  /* Unsigned overflow wraps around.  */				  E1 = UINT_MAX + 1,				  /* Overflow in an unevaluated part of an expression is OK (example				     in the standard).  */				  E2 = 2 || 1 / 0,				  E3 = 1 / 0, /* { dg-warning "warning: division by zero" } */				  /* { dg-error "error: enumerator value for 'E3' is not an integer constant" "enum error" { target *-*-* } 15 } */				  /* But as in DR#031, the 1/0 in an evaluated subexpression means the				     whole expression violates the constraints.  */				  E4 = 0 * (1 / 0), /* { dg-warning "warning: division by zero" } */				  /* { dg-error "error: enumerator value for 'E4' is not an integer constant" "enum error" { xfail *-*-* } 19 } */				  E5 = INT_MAX + 1, /* { dg-warning "warning: integer overflow in expression" } */				  /* Again, overflow in evaluated subexpression.  */				  E6 = 0 * (INT_MAX + 1), /* { dg-warning "warning: integer overflow in expression" } */				  /* A cast does not constitute overflow in conversion.  */				  E7 = (char) INT_MAX				};								struct s {				  int a;				  int : 0 * (1 / 0); /* { dg-warning "warning: division by zero" } */				  int : 0 * (INT_MAX + 1); /* { dg-warning "warning: integer overflow in expression" } */				};								void				f (void)				{				  /* This expression is not required to be a constant expression, so				     it should just involve undefined behavior at runtime.  */				  int c = INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */				}								/* But this expression does need to be constant.  */				static int sc = INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */								/* The first two of these involve overflow, so are not null pointer				   constants.  The third has the overflow in an unevaluated				   subexpression, so is a null pointer constant.  */				void *p = 0 * (INT_MAX + 1); /* { dg-warning "warning: integer overflow in expression" } */				/* { dg-warning "warning: initialization makes pointer from integer without a cast" "null" { target *-*-* } 48 } */				void *q = 0 * (1 / 0); /* { dg-warning "warning: division by zero" } */				/* { dg-warning "warning: initialization makes pointer from integer without a cast" "null" { xfail *-*-* } 50 } */				void *r = (1 ? 0 : INT_MAX+1);								void				g (int i)				{				  switch (i)				    {				    case 0 * (1/0): /* { dg-warning "warning: division by zero" } */				      ;				    case 1 + 0 * (INT_MAX + 1): /* { dg-warning "warning: integer overflow in expression" } */				      ;				    }				}								int				h (void)				{				  return INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */				}								int				h1 (void)				{				  return INT_MAX + 1 - INT_MAX; /* { dg-warning "warning: integer overflow in expression" } */				}								void fuc (unsigned char);				void fsc (signed char);								void				h2 (void)				{				  fsc (SCHAR_MAX + 1);				  fsc (SCHAR_MIN - 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */				  fsc (UCHAR_MAX);				  fsc (UCHAR_MAX + 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */				  fuc (-1);				  fuc (UCHAR_MAX + 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */				  fuc (SCHAR_MIN);				  fuc (SCHAR_MIN - 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */				  fuc (-UCHAR_MAX); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */				}								void fui (unsigned int);				void fsi (signed int);								int si;				unsigned ui;								void				h2i (int x)				{				  /* For some reason, we only give certain warnings for implicit				     conversions among values of the same precision with -Wconversion,				     while we don't give others at all.  */				  fsi ((unsigned)INT_MAX + 1);				  si = (unsigned)INT_MAX + 1;				  si = x ? (unsigned)INT_MAX + 1 : 1;				  fsi ((unsigned)INT_MAX + 2);				  si = (unsigned)INT_MAX + 2;				  si = x ? (unsigned)INT_MAX + 2 : 1;				  fsi (UINT_MAX);				  si = UINT_MAX;				  fui (-1);				  ui = -1;				  ui = x ? -1 : 1U;				  fui (INT_MIN);				  ui = INT_MIN;				  ui = x ? INT_MIN : 1U;				}