/* PR 30457 warn about va_start(ap, invalid) */ /* { dg-do compile } */ /* { dg-options "-std=c99" } */ /* Undefined by C99 7.15.1.4p4 (va_start): "If the parameter parmN is declared with the register storage class, with a function or array type, or with a type that is not compatible with the type that results after application of the default argument promotions, the behavior is undefined." */ #include void foo(register short paramN, ...) { va_list ap; va_start(ap, paramN); /* { dg-warning "undefined behaviour when second parameter of 'va_start' is declared with 'register' storage" } */ /* Undefined by C99 7.15.1.1p2: */ (void) va_arg(ap, char); /* { dg-warning "'char' is promoted to 'int' when passed through '...'" } */ /* { dg-message "note: .so you should pass .int. not .char. to .va_arg.." "" { target *-*-* } 20 } */ /* { dg-message "note: if this code is reached, the program will abort" "" { target *-*-* } 20 } */ va_end(ap); }