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      1 // RUN: %clang_cc1 -fsyntax-only -verify -Wunused-value -Wunused-label %s
      2 // RUN: %clang_cc1 -fsyntax-only -verify -Wunused %s
      3 // RUN: %clang_cc1 -fsyntax-only -verify -Wall %s
      4 
      5 int i = 0;
      6 int j = 0;
      7 
      8 void foo();
      9 
     10 // PR4806
     11 void pr4806() {
     12   1,foo();          // expected-warning {{expression result unused}}
     13 
     14   // other
     15   foo();
     16   i;                // expected-warning {{expression result unused}}
     17 
     18   i,foo();          // expected-warning {{expression result unused}}
     19   foo(),i;          // expected-warning {{expression result unused}}
     20 
     21   i,j,foo();        // expected-warning {{expression result unused}} expected-warning {{expression result unused}}
     22   i,foo(),j;        // expected-warning {{expression result unused}} expected-warning {{expression result unused}}
     23   foo(),i,j;        // expected-warning {{expression result unused}} expected-warning {{expression result unused}}
     24 
     25   i++;
     26 
     27   i++,foo();
     28   foo(),i++;
     29 
     30   i++,j,foo();      // expected-warning {{expression result unused}}
     31   i++,foo(),j;      // expected-warning {{expression result unused}}
     32   foo(),i++,j;      // expected-warning {{expression result unused}}
     33 
     34   i,j++,foo();      // expected-warning {{expression result unused}}
     35   i,foo(),j++;      // expected-warning {{expression result unused}}
     36   foo(),i,j++;      // expected-warning {{expression result unused}}
     37 
     38   i++,j++,foo();
     39   i++,foo(),j++;
     40   foo(),i++,j++;
     41 
     42   {};
     43   ({});
     44   ({}),foo();
     45   foo(),({});
     46 
     47   (int)1U;          // expected-warning {{expression result unused}}
     48   (void)1U;
     49 
     50   // pointer to volatile has side effect (thus no warning)
     51   int* pi = &i;
     52   volatile int* pj = &j;
     53   *pi;              // expected-warning {{expression result unused}}
     54   *pj;
     55 
     56   foo_label:        // expected-warning {{unused label}}
     57   i;                // expected-warning {{expression result unused}}
     58 }
     59 
     60 // Don't warn about unused '||', '&&' expressions that contain assignments.
     61 int test_logical_foo1();
     62 int test_logical_foo2();
     63 int test_logical_foo3();
     64 int test_logical_bar() {
     65   int x = 0;
     66   (x = test_logical_foo1()) ||  // no-warning
     67   (x = test_logical_foo2()) ||  // no-warning
     68   (x = test_logical_foo3());    // no-warning
     69 
     70   x || test_logical_foo1();     // no-warning
     71 
     72   return x;
     73 }
     74 
     75 // PR8282
     76 void conditional_for_control_flow(int cond, int x, int y)
     77 {
     78     cond? y++ : x; // no-warning
     79     cond? y : ++x; // no-warning
     80     cond? (x |= y) : ++x; // no-warning
     81     cond? y : x; // expected-warning {{expression result unused}}
     82 }
     83 
     84 struct s0 { int f0; };
     85 
     86 void f0(int a);
     87 void f1(struct s0 *a) {
     88   // rdar://8139785
     89   f0((int)(a->f0 + 1, 10)); // expected-warning {{expression result unused}}
     90 }
     91