llvm-project/clang/test/Sema/function-sentinel-attr.c

// RUN: %clang_cc1  -fsyntax-only -verify %s

#define NULL (void*)0

#define ATTR __attribute__ ((__sentinel__)) 

void foo1 (int x, ...) ATTR; // expected-note {{function has been explicitly marked sentinel here}}
void foo5 (int x, ...) __attribute__ ((__sentinel__(1))); // expected-note {{function has been explicitly marked sentinel here}}
void foo6 (int x, ...) __attribute__ ((__sentinel__(5))); // expected-note {{function has been explicitly marked sentinel here}}
void foo7 (int x, ...) __attribute__ ((__sentinel__(0))); // expected-note {{function has been explicitly marked sentinel here}}
void foo10 (int x, ...) __attribute__ ((__sentinel__(1,1)));
void foo12 (int x, ... ) ATTR; // expected-note {{function has been explicitly marked sentinel here}}

int main ()
{

  foo1(1, NULL); // OK
  foo1(1, 0) ; // expected-warning {{missing sentinel in function call}}
  foo5(1, NULL, 2);  // OK
  foo5(1,2,NULL, 1); // OK
  foo5(1, NULL, 2, 1); // expected-warning {{missing sentinel in function call}}

  foo6(1,2,3,4,5,6,7); // expected-warning {{missing sentinel in function call}}
  foo6(1,NULL,3,4,5,6,7); // OK
  foo7(1); // expected-warning {{not enough variable arguments in 'foo7' declaration to fit a sentinel}}
  foo7(1, NULL); // OK

  foo12(1); // expected-warning {{not enough variable arguments in 'foo12' declaration to fit a sentinel}}
}