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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [testsuite/] [gcc.dg/] [warn-addr-cmp.c] - Rev 689
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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; }