1 /* PR tree-optimization/83508 - c-c++-common/Wrestrict.c fails since r255836
2    Test to verify that only one of -Wrestrict and -Wstringop-overflow is
3    issued for a problem where either would be appropriate.
4    { dg-do compile }
5    { dg-options "-O2 -Wrestrict -Wstringop-overflow" } */
6 
7 #define DIFF_MAX __PTRDIFF_MAX__
8 
9 typedef __PTRDIFF_TYPE__ ptrdiff_t;
10 typedef __SIZE_TYPE__ size_t;
11 
12 void sink (void*);
13 
f(ptrdiff_t i,size_t n)14 void f (ptrdiff_t i, size_t n)
15 {
16   if (i < DIFF_MAX - 2 || DIFF_MAX - 1 > i)
17     i = DIFF_MAX - 2;
18 
19   if (n < 4 || 5 < n)
20     n = 4;
21 
22   char a[8] = "012";
23 
24   /* The following could very well be diagnosed by -Wstringop-overflow
25      instead but there's no way to verify that only one of the two
26      warnings is issued and the choice of -Wrestrict simply reflects
27      the fact that -Wrestrict runs before -Wstringop-overflow.  */
28   __builtin_strncpy (a + i, a, n);   /* { dg-warning "\\\[-Wrestrict]" } */
29   sink (a);
30 }
31