1 /* { dg-do compile } */
2 /* { dg-options "-std=c2x" } */
3 void tvoid(void* x);
4 void transpose0(double* out, const double* in) { }
5 void transpose1(double out[2][2], const double in[2][2]) { }
6 void transpose2(double out[2][2][2], const double in[2][2][2]) { }
7 // return
8 int (*y2(const int x[3][3]))[3] { return x; } /* { dg-warning "return discards 'const' qualifier from pointer target type" } */
9 const int (*y3(int x[3][3]))[3] { return x; }
10 void test(void)
11 {
12 double x0[2];
13 double y0[2];
14 const double z0[4];
15 double x1[2][2];
16 double y1[2][2];
17 double o1[2][3];
18 const double z1[2][2];
19 double x2[2][2][2];
20 double y2[2][2][2];
21 double o2[2][2][3];
22 const double z2[2][2][2];
23 // void pointers
24 tvoid(x0);
25 tvoid(x1);
26 tvoid(x2);
27 tvoid(z0); /* { dg-warning "passing argument 1 of 'tvoid' discards 'const' qualifier from pointer target type" } */
28 tvoid(z1); /* { dg-warning "passing argument 1 of 'tvoid' discards 'const' qualifier from pointer target type" } */
29 tvoid(z2); /* { dg-warning "passing argument 1 of 'tvoid' discards 'const' qualifier from pointer target type" } */
30 void* p;
31 const void* pc;
32 p = x0;
33 p = x1;
34 p = x2;
35 p = z0; /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
36 p = z1; /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
37 p = z2; /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
38 pc = x0;
39 pc = x1;
40 pc = x2;
41 pc = z0;
42 pc = z1;
43 pc = z2;
44 transpose0(pc, p); /* { dg-warning "passing argument 1 of 'transpose0' discards 'const' qualifier from pointer target type" } */
45 transpose1(pc, p); /* { dg-warning "passing argument 1 of 'transpose1' discards 'const' qualifier from pointer target type" } */
46 transpose2(pc, p); /* { dg-warning "passing argument 1 of 'transpose2' discards 'const' qualifier from pointer target type" } */
47 transpose0(p, pc);
48 transpose1(p, pc);
49 transpose2(p, pc);
50 // passing as arguments
51 transpose0(y0, x0);
52 transpose1(y1, x1);
53 transpose2(y2, x2);
54 // initialization
55 const double (*u0p) = x0;
56 const double (*u1p)[2] = x1;
57 const double (*u2p)[2][2] = x2;
58 double (*v0p) = z0; /* { dg-warning "initialization discards 'const' qualifier from pointer target type" } */
59 double (*v1p)[2] = z1; /* { dg-warning "initialization discards 'const' qualifier from pointer target type" } */
60 double (*v2p)[2][2] = z2; /* { dg-warning "initialization discards 'const' qualifier from pointer target type" } */
61 // subtraction
62 &(x0[1]) - &(z0[0]);
63 &(x1[1]) - &(z1[0]);
64 &(x2[1]) - &(z2[0]);
65 // comparison
66 x0 == z0;
67 x1 == z1;
68 x2 == z2;
69 x0 < z0;
70 x1 < z1;
71 x2 < z2;
72 x0 > z0;
73 x1 > z1;
74 x2 > z2;
75 // assignment
76 u0p = x0;
77 u1p = x1;
78 u2p = x2;
79 v0p = z0; /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
80 v1p = z1; /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
81 v2p = z2; /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
82 // conditional expressions
83 (void)(1 ? x0 : z0);
84 (void)(1 ? x1 : z1);
85 (void)(1 ? x2 : z2);
86 (void)(1 ? x0 : x1); /* { dg-warning "pointer type mismatch in conditional expression" } */
87 (void)(1 ? x1 : x2); /* { dg-warning "pointer type mismatch in conditional expression" } */
88 (void)(1 ? x2 : x0); /* { dg-warning "pointer type mismatch in conditional expression" } */
89 v0p = (1 ? z0 : v0p); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
90 v1p = (1 ? z1 : v1p); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
91 v2p = (1 ? z2 : v2p); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
92 v0p = (1 ? x0 : u0p); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
93 v1p = (1 ? x1 : u1p); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
94 v2p = (1 ? x2 : u2p); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
95 (1 ? x0 : z0)[0] = 1; /* { dg-error "assignment of read-only location" } */
96 (1 ? x1 : z1)[0][0] = 1; /* { dg-error "assignment of read-only location" } */
97 (1 ? x2 : z2)[0][0][0] = 1; /* { dg-error "assignment of read-only location" } */
98 v0p = (1 ? p : z0); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
99 v1p = (1 ? p : z1); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
100 v2p = (1 ? p : z2); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
101 v0p = (1 ? pc : x0); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
102 v1p = (1 ? pc : x1); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
103 v2p = (1 ? pc : x2); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
104 }
105