1 /* { dg-do compile } */
2 /* { dg-options "-std=c2x -pedantic-errors" } */
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 (*x2(const int x[3][3]))[3] { return x; } /* { dg-error "return discards" } */
9 const int (*x3(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(z0); /* { dg-error "passing argument 1 of 'tvoid' discards 'const' qualifier from pointer target type" } */
25 tvoid(z1); /* { dg-error "passing argument 1 of 'tvoid' discards 'const' qualifier from pointer target type" } */
26 tvoid(z2); /* { dg-error "passing argument 1 of 'tvoid' discards 'const' qualifier from pointer target type" } */
27 void* p;
28 const void* pc;
29 p = x0;
30 p = x1;
31 p = x2;
32 p = z0; /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
33 p = z1; /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
34 p = z2; /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
35 pc = x0;
36 pc = x1;
37 pc = x2;
38 pc = z0;
39 pc = z1;
40 pc = z2;
41 transpose0(pc, p); /* { dg-error "passing argument 1 of 'transpose0' discards 'const' qualifier from pointer target type" } */
42 transpose1(pc, p); /* { dg-error "passing argument 1 of 'transpose1' discards 'const' qualifier from pointer target type" } */
43 transpose2(pc, p); /* { dg-error "passing argument 1 of 'transpose2' discards 'const' qualifier from pointer target type" } */
44 transpose0(p, pc);
45 transpose1(p, pc);
46 transpose2(p, pc);
47 // passing as arguments
48 transpose0(y0, x0);
49 transpose1(y1, o1); /* { dg-error "passing argument 2 of 'transpose1' from incompatible pointer type" } */
50 transpose1(y1, x1);
51 transpose2(y2, o2); /* { dg-error "passing argument 2 of 'transpose2' from incompatible pointer type" } */
52 transpose2(y2, x2);
53 // initialization
54 const double (*x0p) = x0;
55 const double (*x1p)[2] = x1;
56 const double (*x2p)[2][2] = x2;
57 double (*v0p) = z0; /* { dg-error "initialization discards 'const' qualifier from pointer target type" } */
58 double (*v1p)[2] = z1; /* { dg-error "initialization discards" } */
59 double (*v2p)[2][2] = z2; /* { dg-error "initialization discards" } */
60 // assignment
61 x0p = x0;
62 x1p = x1;
63 x2p = x2;
64 // subtraction
65 &(x0[1]) - &(z0[0]);
66 &(x1[1]) - &(z1[0]);
67 &(x2[1]) - &(z2[0]);
68 // comparison
69 x0 == z0;
70 x1 == z1;
71 x2 == z2;
72 x0 < z0;
73 x1 < z1;
74 x2 < z2;
75 x0 > z0;
76 x1 > z1;
77 x2 > z2;
78 // conditional expressions
79 (void)(1 ? x0 : z0);
80 (void)(1 ? x1 : z1);
81 (void)(1 ? x2 : z2);
82 (void)(1 ? x0 : x1); /* { dg-error "pointer type mismatch in conditional expression" } */
83 (void)(1 ? x1 : x2); /* { dg-error "pointer type mismatch in conditional expression" } */
84 (void)(1 ? x2 : x0); /* { dg-error "pointer type mismatch in conditional expression" } */
85 v0p = (1 ? z0 : v0p); /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
86 v1p = (1 ? z1 : v1p); /* { dg-error "assignment discards" } */
87 v2p = (1 ? z2 : v2p); /* { dg-error "assignment discards" } */
88 v0p = (1 ? x0 : x0p); /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
89 v1p = (1 ? x1 : x1p); /* { dg-error "assignment discards" } */
90 v2p = (1 ? x2 : x2p); /* { dg-error "assignment discards" } */
91 (1 ? x0 : z0)[0] = 1; /* { dg-error "assignment of read-only location" } */
92 (1 ? x1 : z1)[0][0] = 1; /* { dg-error "assignment of read-only location" } */
93 (1 ? x2 : z2)[0][0][0] = 1; /* { dg-error "assignment of read-only location" } */
94 v0p = (1 ? p : z0); /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
95 v1p = (1 ? p : z1); /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
96 v2p = (1 ? p : z2); /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
97 v0p = (1 ? pc : x0); /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
98 v1p = (1 ? pc : x1); /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
99 v2p = (1 ? pc : x2); /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
100 }
101