gcc/testsuite/gcc.dg/Wbad-function-cast-1.c

   1 /* Test operation of -Wbad-function-cast.  Bug 6980 complained of the
   2    wording of the diagnostic.  */
   3 /* Origin: Joseph Myers <jsm@polyomino.org.uk> */
   4 /* { dg-do compile } */
   5 /* { dg-options "-Wbad-function-cast" } */
   6
   7 void vf(void);
   8 int if1(void);
   9 char if2(void);
  10 long if3(void);
  11 float rf1(void);
  12 double rf2(void);
  13 _Complex double cf(void);
  14 enum e { E1 } ef(void);
  15 _Bool bf(void);
  16 char *pf1(void);
  17 int *pf2(void);
  18
  19 void
  20 foo(void)
  21 {
  22   /* Casts to void types are always OK.  */
  23   (void)vf();
  24   (void)if1();
  25   (void)cf();
  26   (const void)bf();
  27   /* Casts to the same type or similar types are OK.  */
  28   (int)if1();
  29   (long)if2();
  30   (char)if3();
  31   (float)rf1();
  32   (long double)rf2();
  33   (_Complex float)cf();
  34   (enum f { F1 })ef();
  35   (_Bool)bf();
  36   (void *)pf1();
  37   (char *)pf2();
  38   /* Casts to types with different TREE_CODE (which is how this
  39      warning has been defined) are not OK, except for casts to void
  40      types.  */
  41   (float)if1(); /* { dg-warning "cast from function call of type 'int' to non-matching type 'float'" } */
  42   (double)if2(); /* { dg-warning "cast from function call of type 'char' to non-matching type 'double'" } */
  43   (_Bool)if3(); /* { dg-warning "cast from function call of type 'long int' to non-matching type '_Bool'" } */
  44   (int)rf1(); /* { dg-warning "cast from function call of type 'float' to non-matching type 'int'" } */
  45   (long)rf2(); /* { dg-warning "cast from function call of type 'double' to non-matching type 'long int'" } */
  46   (double)cf(); /* { dg-warning "cast from function call of type 'complex double' to non-matching type 'double'" } */
  47   (int)ef(); /* { dg-warning "cast from function call of type 'enum e' to non-matching type 'int'" } */
  48   (int)bf(); /* { dg-warning "cast from function call of type '_Bool' to non-matching type 'int'" } */
  49   (__SIZE_TYPE__)pf1(); /* { dg-warning "cast from function call of type 'char \\*' to non-matching type '\[^\\n\]*'" } */
  50   (__PTRDIFF_TYPE__)pf2(); /* { dg-warning "cast from function call of type 'int \\*' to non-matching type '\[^\\n\]*'" } */
  51 }