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

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