gcc/testsuite/c-c++-common/Wunused-var-1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-Wunused" } */
   3
   4 void
   5 f1 (void)
   6 {
   7   int a;        /* { dg-warning "set but not used" } */
   8   int b;
   9   int c;
  10   c = 1;
  11   a = b = c;
  12 }
  13
  14 void
  15 f2 (int x)
  16 {
  17   int a;        /* { dg-warning "set but not used" } */
  18   int b;
  19   int c;        /* { dg-warning "set but not used" } */
  20   c = (a = x, b = x);
  21 }
  22
  23 int
  24 f3 (int x)
  25 {
  26   int a;
  27   return a = x;
  28 }
  29
  30 int
  31 f4 (int x)
  32 {
  33   int a;
  34   a = x;
  35   return a;
  36 }
  37
  38 void
  39 f5 (int x)
  40 {
  41   int a[2];     /* { dg-warning "set but not used" } */
  42   int b;
  43   int *c, d[2];
  44   c = d;
  45   b = x;
  46   a[b] = 1;
  47   c[b] = 1;
  48 }
  49
  50 int
  51 f6 (int x)
  52 {
  53   int a[2];
  54   int b;
  55   b = x;
  56   a[b] = 1;
  57   return a[b];
  58 }
  59
  60 void
  61 f7 (int x, int *p)
  62 {
  63   int *a[2];
  64   a[x] = p;
  65   a[x][x] = x;
  66 }
  67
  68 struct S { int i; };
  69
  70 void
  71 f8 (void)
  72 {
  73   struct S s;   /* { dg-warning "set but not used" } */
  74   s.i = 6;
  75 }
  76
  77 int
  78 f9 (void)
  79 {
  80   struct S s;
  81   s.i = 6;
  82   return s.i;
  83 }
  84
  85 struct S
  86 f10 (void)
  87 {
  88   struct S s;
  89   s.i = 6;
  90   return s;
  91 }
  92
  93 extern int foo11 (int *);
  94
  95 void
  96 f11 (void)
  97 {
  98   int a[2];
  99   foo11 (a);
 100 }
 101
 102 void
 103 f12 (void)
 104 {
 105   int a;
 106   a = 1;
 107   a;    /* { dg-warning "no effect" } */
 108 }
 109
 110 void
 111 f13 (void (*x) (void))
 112 {
 113   void (*a) (void);
 114   a = x;
 115   a ();
 116 }
 117
 118 void
 119 f14 (void (*x) (void))
 120 {
 121   void (*a) (void);     /* { dg-warning "set but not used" } */
 122   a = x;
 123 }
 124
 125 extern void foo15 (int *);
 126
 127 void
 128 f15 (void)
 129 {
 130   int a[10];
 131   int *b = a + 2;
 132   foo15 (b);
 133 }
 134
 135 extern void foo16 (int **);
 136
 137 void
 138 f16 (void)
 139 {
 140   int a[10];
 141   int *b[] = { a, a + 2 };
 142   foo16 (b);
 143 }
 144
 145 void
 146 f17 (int x)
 147 {
 148   long a;       /* { dg-warning "set but not used" } */
 149   int b;
 150   a = b = x;
 151 }
 152
 153 void
 154 f18 (int x)
 155 {
 156   int a;        /* { dg-warning "set but not used" } */
 157   int b;
 158   a = (char) (b = x);
 159 }
 160
 161 int
 162 f19 (int x, int y, int z)
 163 {
 164   int a;
 165   int b;
 166   a = x;
 167   b = y;
 168   return z ? a : b;
 169 }
 170
 171 int *
 172 f20 (int x)
 173 {
 174   static int a[] = { 3, 4, 5, 6 };
 175   static int b[] = { 4, 5, 6, 7 };
 176   static int c[] = { 5, 6, 7, 8 };      /* { dg-warning "set but not used" } */
 177   c[1] = 1;
 178   return x ? a : b;
 179 }