gcc/testsuite/gcc.dg/c2x-qual-4.c

   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