llvm-project/clang/test/Sema/conditional-expr.c

// RUN: %clang_cc1 -fsyntax-only -verify -pedantic -Wsign-compare %s
void foo() {
  *(0 ? (double *)0 : (void *)0) = 0;
  // FIXME: GCC doesn't consider the the following two statements to be errors.
  *(0 ? (double *)0 : (void *)(int *)0) = 0; // expected-error {{incomplete type 'void' is not assignable}}
  *(0 ? (double *)0 : (void *)(double *)0) = 0; // expected-error {{incomplete type 'void' is not assignable}}
  *(0 ? (double *)0 : (int *)(void *)0) = 0; // expected-error {{incomplete type 'void' is not assignable}} expected-warning {{pointer type mismatch ('double *' and 'int *')}}
  *(0 ? (double *)0 : (double *)(void *)0) = 0;
  *((void *) 0) = 0; // expected-error {{incomplete type 'void' is not assignable}}
  double *dp;
  int *ip;
  void *vp;

  dp = vp;
  vp = dp;
  ip = dp; // expected-warning {{incompatible pointer types assigning to 'int *' from 'double *'}}
  dp = ip; // expected-warning {{incompatible pointer types assigning to 'double *' from 'int *'}}
  dp = 0 ? (double *)0 : (void *)0;
  vp = 0 ? (double *)0 : (void *)0;
  ip = 0 ? (double *)0 : (void *)0; // expected-warning {{incompatible pointer types assigning to 'int *' from 'double *'}}

  const int *cip;
  vp = (0 ? vp : cip); // expected-warning {{discards qualifiers}}
  vp = (0 ? cip : vp); // expected-warning {{discards qualifiers}}

  int i = 2;
  int (*pf)[2];
  int (*pv)[i];
  pf = (i ? pf : pv);

  enum {xxx,yyy,zzz} e, *ee;
  short x;
  ee = ee ? &x : ee ? &i : &e; // expected-warning {{pointer type mismatch}}

  typedef void *asdf;
  *(0 ? (asdf) 0 : &x) = 10;

  unsigned long test0 = 5;
  test0 = test0 ? (long) test0 : test0; // expected-warning {{operands of ? are integers of different signs}}
  test0 = test0 ? (int) test0 : test0; // expected-warning {{operands of ? are integers of different signs}}
  test0 = test0 ? (short) test0 : test0; // expected-warning {{operands of ? are integers of different signs}}
  test0 = test0 ? test0 : (long) test0; // expected-warning {{operands of ? are integers of different signs}}
  test0 = test0 ? test0 : (int) test0; // expected-warning {{operands of ? are integers of different signs}}
  test0 = test0 ? test0 : (short) test0; // expected-warning {{operands of ? are integers of different signs}}
  test0 = test0 ? test0 : (long) 10;
  test0 = test0 ? test0 : (int) 10;
  test0 = test0 ? test0 : (short) 10;
  test0 = test0 ? (long) 10 : test0;
  test0 = test0 ? (int) 10 : test0;
  test0 = test0 ? (short) 10 : test0;

  enum Enum { EVal };
  test0 = test0 ? EVal : test0;
  test0 = test0 ? EVal : (int) test0; // okay: EVal is an int
  test0 = test0 ? // expected-warning {{operands of ? are integers of different signs}}
                  (unsigned) EVal
                : (int) test0;
}

int Postgresql() {
  char x;
  return ((((&x) != ((void *) 0)) ? (*(&x) = ((char) 1)) : (void) ((void *) 0)), (unsigned long) ((void *) 0)); // expected-warning {{C99 forbids conditional expressions with only one void side}}
}

#define nil ((void*) 0)

extern int f1(void);

int f0(int a) {
  // GCC considers this a warning.
  return a ? f1() : nil; // expected-warning {{pointer/integer type mismatch in conditional expression ('int' and 'void *')}} expected-warning {{incompatible pointer to integer conversion returning 'void *' from a function with result type 'int'}}
}

int f2(int x) {
  // We can suppress this because the immediate context wants an int.
  return (x != 0) ? 0U : x;
}