clang/test/SemaCXX/warn-cast-function-type-strict.cpp

   1 // RUN: %clang_cc1 %s -fblocks -fsyntax-only -Wcast-function-type -verify=expected,strict
   2 // RUN: %clang_cc1 %s -fblocks -fsyntax-only -Wcast-function-type-strict -verify=expected,strict
   3 // RUN: %clang_cc1 %s -fblocks -fsyntax-only -Wextra -verify
   4
   5 int x(long);
   6
   7 typedef int (f1)(long);
   8 typedef int (f2)(void*);
   9 typedef int (f3)(...);
  10 typedef void (f4)(...);
  11 typedef void (f5)(void);
  12 typedef int (f6)(long, int);
  13 typedef int (f7)(long,...);
  14 typedef int (&f8)(long, int);
  15
  16 f1 *a;
  17 f2 *b;
  18 f3 *c;
  19 f4 *d;
  20 f5 *e;
  21 f6 *f;
  22 f7 *g;
  23
  24 struct S
  25 {
  26   void foo (int*);
  27   void bar (int);
  28 };
  29
  30 typedef void (S::*mf)(int);
  31
  32 enum E : long;
  33 int efunc(E);
  34
  35 // Produce the underlying `long` type implicitly.
  36 enum E2 { big = __LONG_MAX__ };
  37 int e2func(E2);
  38
  39 void foo() {
  40   a = (f1 *)x;
  41   a = (f1 *)efunc; // strict-warning {{cast from 'int (*)(E)' to 'f1 *' (aka 'int (*)(long)') converts to incompatible function type}}
  42   a = (f1 *)e2func; // strict-warning {{cast from 'int (*)(E2)' to 'f1 *' (aka 'int (*)(long)') converts to incompatible function type}}
  43   b = (f2 *)x; // expected-warning {{cast from 'int (*)(long)' to 'f2 *' (aka 'int (*)(void *)') converts to incompatible function type}}
  44   b = reinterpret_cast<f2 *>(x); // expected-warning {{cast from 'int (*)(long)' to 'f2 *' (aka 'int (*)(void *)') converts to incompatible function type}}
  45   c = (f3 *)x; // strict-warning {{cast from 'int (*)(long)' to 'f3 *' (aka 'int (*)(...)') converts to incompatible function type}}
  46   d = (f4 *)x; // expected-warning {{cast from 'int (*)(long)' to 'f4 *' (aka 'void (*)(...)') converts to incompatible function type}}
  47   e = (f5 *)x; // strict-warning {{cast from 'int (*)(long)' to 'f5 *' (aka 'void (*)()') converts to incompatible function type}}
  48   f = (f6 *)x; // expected-warning {{cast from 'int (*)(long)' to 'f6 *' (aka 'int (*)(long, int)') converts to incompatible function type}}
  49   g = (f7 *)x; // strict-warning {{cast from 'int (*)(long)' to 'f7 *' (aka 'int (*)(long, ...)') converts to incompatible function type}}
  50
  51   mf p1 = (mf)&S::foo; // expected-warning {{cast from 'void (S::*)(int *)' to 'mf' (aka 'void (S::*)(int)') converts to incompatible function type}}
  52
  53   f8 f2 = (f8)x; // expected-warning {{cast from 'int (long)' to 'f8' (aka 'int (&)(long, int)') converts to incompatible function type}}
  54   (void)f2;
  55
  56   int (^y)(long);
  57   f = (f6 *)y; // expected-warning {{cast from 'int (^)(long)' to 'f6 *' (aka 'int (*)(long, int)') converts to incompatible function type}}
  58 }