Viewing file:  warn-addr-cmp.c (2.14 KB) -rw-r--r--
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/* { dg-do compile } */
/* { dg-require-weak "" } */
/* { dg-options "-Waddress" } */
/* Warning when addr convert to bool always gives known result.
Ada/Pascal programmers sometimes write 0-param functions without
(), and might as well warn on variables, too. */
int func (void);
extern int var;
int weak_func (void) __attribute__ ((weak));
extern int weak_var __attribute__ ((weak));
int
test_func_cmp (void)
{
if (func) /* { dg-warning "the address of 'func'" } */
return 1;
if (!func) /* { dg-warning "the address of 'func'" } */
return 1;
if (&var) /* { dg-warning "the address of 'var'" } */
return 1;
if (!&var) /* { dg-warning "the address of 'var'" } */
return 1;
if (weak_func)
return 1;
if (!weak_func)
return 1;
if (&weak_var)
return 1;
if (!&weak_var)
return 1;
return 0;
}
/* Test equality with 0 on the right hand side. */
int
test_func_cmp_rhs_zero (void)
{
if (func == 0) /* { dg-warning "the comparison will always evaluate as 'false'" } */
return 1;
if (func != 0) /* { dg-warning "the comparison will always evaluate as 'true'" } */
return 1;
if (&var == 0) /* { dg-warning "the comparison will always evaluate as 'false'" } */
return 1;
if (&var != 0) /* { dg-warning "the comparison will always evaluate as 'true'" } */
return 1;
if (weak_func == 0)
return 1;
if (weak_func != 0)
return 1;
if (&weak_var == 0)
return 1;
if (&weak_var != 0)
return 1;
return 0;
}
/* Test equality with 0 on the left hand side. */
int
test_func_cmp_lhs_zero (void)
{
if (0 == func) /* { dg-warning "the comparison will always evaluate as 'false'" } */
return 1;
if (0 != func) /* { dg-warning "the comparison will always evaluate as 'true'" } */
return 1;
if (0 == &var) /* { dg-warning "the comparison will always evaluate as 'false'" } */
return 1;
if (0 != &var) /* { dg-warning "the comparison will always evaluate as 'true'" } */
return 1;
if (0 == weak_func)
return 1;
if (0 != weak_func)
return 1;
if (0 == &weak_var)
return 1;
if (0 != &weak_var)
return 1;
return 0;
}
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