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  }