gcc/testsuite/gcc.dg/pointer-array-quals-2.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-Wdiscarded-array-qualifiers -pedantic-errors" } */
   3 /* Origin: Martin Uecker <uecker@eecs.berkeley.edu> */
   4 void tvoid(void* x);
   5 void transpose0(double* out, const double* in) { }
   6 void transpose1(double out[2][2], const double in[2][2]) { }
   7 void transpose2(double out[2][2][2], const double in[2][2][2]) { }
   8 // return
   9 int (*x2(const int x[3][3]))[3] { return x; } /* { dg-error "pointers to arrays with different qualifiers|return discards" } */
  10 const int (*x3(int x[3][3]))[3] { return x; } /* { dg-error "pointers to arrays with different qualifiers" } */
  11 void test(void)
  12 {
  13         double x0[2];
  14         double y0[2];
  15         const double z0[4];
  16         double x1[2][2];
  17         double y1[2][2];
  18         double o1[2][3];
  19         const double z1[2][2];
  20         double x2[2][2][2];
  21         double y2[2][2][2];
  22         double o2[2][2][3];
  23         const double z2[2][2][2];
  24         // void pointers
  25         tvoid(z0); /* { dg-error "passing argument 1 of 'tvoid' discards 'const' qualifier from pointer target type" } */
  26         tvoid(z1); /* { dg-warning "passing argument 1 of 'tvoid' discards 'const' qualifier from pointer target type" } */
  27         tvoid(z2); /* { dg-warning "passing argument 1 of 'tvoid' discards 'const' qualifier from pointer target type" } */
  28         void* p;
  29         const void* pc;
  30         p = x0;
  31         p = x1;
  32         p = x2;
  33         p = z0; /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
  34         p = z1; /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
  35         p = z2; /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
  36         pc = x0;
  37         pc = x1;
  38         pc = x2;
  39         pc = z0;
  40         pc = z1;
  41         pc = z2;
  42         transpose0(pc, p); /* { dg-error "passing argument 1 of 'transpose0' discards 'const' qualifier from pointer target type" } */
  43         transpose1(pc, p); /* { dg-error "passing argument 1 of 'transpose1' discards 'const' qualifier from pointer target type" } */
  44         transpose2(pc, p); /* { dg-error "passing argument 1 of 'transpose2' discards 'const' qualifier from pointer target type" } */
  45         transpose0(p, pc);
  46         transpose1(p, pc); /* { dg-error "passing argument 2 of 'transpose1' discards 'const' qualifier from pointer target type" } */
  47         transpose2(p, pc); /* { dg-error "passing argument 2 of 'transpose2' discards 'const' qualifier from pointer target type" } */
  48         // passing as arguments
  49         transpose0(y0, x0);
  50         transpose1(y1, o1); /* { dg-error "passing argument 2 of 'transpose1' from incompatible pointer type" } */
  51         transpose1(y1, x1); /* { dg-error "pointers to arrays with different qualifiers" } */
  52         transpose2(y2, o2); /* { dg-error "passing argument 2 of 'transpose2' from incompatible pointer type" } */
  53         transpose2(y2, x2); /* { dg-error "pointers to arrays with different qualifiers" } */
  54         // initialization
  55         const double (*x0p) = x0;
  56         const double (*x1p)[2] = x1; /* { dg-error "pointers to arrays with different qualifiers" } */
  57         const double (*x2p)[2][2] = x2; /* { dg-error "pointers to arrays with different qualifiers" } */
  58         double (*v0p) = z0; /* { dg-error "initialization discards 'const' qualifier from pointer target type" } */
  59         double (*v1p)[2] = z1; /* { dg-error "pointers to arrays with different qualifiers|initialization discards" } */
  60         double (*v2p)[2][2] = z2; /* { dg-error "pointers to arrays with different qualifiers|initialization discards" } */
  61         // assignment
  62         x0p = x0;
  63         x1p = x1; /* { dg-error "pointers to arrays with different qualifiers" } */
  64         x2p = x2; /* { dg-error "pointers to arrays with different qualifiers" } */
  65         // subtraction
  66         &(x0[1]) - &(z0[0]);
  67         &(x1[1]) - &(z1[0]); /* { dg-error "pointers to arrays with different qualifiers" } */
  68         &(x2[1]) - &(z2[0]); /* { dg-error "pointers to arrays with different qualifiers" } */
  69         // comparison
  70         x0 == z0;
  71         x1 == z1; /* { dg-error "pointers to arrays with different qualifiers" } */
  72         x2 == z2; /* { dg-error "pointers to arrays with different qualifiers" } */
  73         x0 < z0;
  74         x1 < z1; /* { dg-error "pointers to arrays with different qualifiers" } */
  75         x2 < z2; /* { dg-error "pointers to arrays with different qualifiers" } */
  76         x0 > z0;
  77         x1 > z1; /* { dg-error "pointers to arrays with different qualifiers" } */
  78         x2 > z2; /* { dg-error "pointers to arrays with different qualifiers" } */
  79         // conditional expressions
  80         (void)(1 ? x0 : z0);
  81         (void)(1 ? x1 : z1); /* { dg-error "pointers to arrays with different qualifiers" } */
  82         (void)(1 ? x2 : z2); /* { dg-error "pointers to arrays with different qualifiers" } */
  83         (void)(1 ? x0 : x1); /* { dg-error "pointer type mismatch in conditional expression" } */
  84         (void)(1 ? x1 : x2); /* { dg-error "pointer type mismatch in conditional expression" } */
  85         (void)(1 ? x2 : x0); /* { dg-error "pointer type mismatch in conditional expression" } */
  86         v0p = (1 ? z0 : v0p); /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
  87         v1p = (1 ? z1 : v1p); /* { dg-error "pointers to arrays with different qualifiers|assignment discards" } */
  88         v2p = (1 ? z2 : v2p); /* { dg-error "pointers to arrays with different qualifiers|assignment discards" } */
  89         v0p = (1 ? x0 : x0p); /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
  90         v1p = (1 ? x1 : x1p); /* { dg-error "pointers to arrays with different qualifiers|assignment discards" } */
  91         v2p = (1 ? x2 : x2p); /* { dg-error "pointers to arrays with different qualifiers|assignment discards" } */
  92         (1 ? x0 : z0)[0] = 1; /* { dg-error "assignment of read-only location" } */
  93         (1 ? x1 : z1)[0][0] = 1; /* { dg-error "assignment of read-only location|pointers to arrays" } */
  94         (1 ? x2 : z2)[0][0][0] = 1; /* { dg-error "assignment of read-only location|pointers to arrays" } */
  95         v0p = (1 ? p : z0); /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
  96         v1p = (1 ? p : z1); /* { dg-warning "pointer to array loses qualifier in conditional expression" } */
  97         v2p = (1 ? p : z2); /* { dg-warning "pointer to array loses qualifier in conditional expression" } */
  98         v0p = (1 ? pc : x0); /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
  99         v1p = (1 ? pc : x1); /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
 100         v2p = (1 ? pc : x2); /* { dg-error "assignment discards 'const' qualifier from pointer target type" } */
 101 }
 102