clang/test/Sema/return-noreturn.c

// RUN: %clang_cc1 %s -fsyntax-only -verify -fblocks -Wmissing-noreturn -Wno-unreachable-code

int j;
void test1() { // expected-warning {{function 'test1' could be declared with attribute 'noreturn'}}
  ^ (void) { while (1) { } }();
  ^ (void) { if (j) while (1) { } }();
  while (1) { }
}

void test2() {
  if (j) while (1) { }
}

__attribute__((__noreturn__))
void test2_positive() {
  if (j) while (1) { }
} // expected-warning{{function declared 'noreturn' should not return}}


// This test case illustrates that we don't warn about the missing return
// because the function is marked noreturn and there is an infinite loop.
extern int foo_test_3();
__attribute__((__noreturn__)) void* test3(int arg) {
  while (1) foo_test_3();
}

__attribute__((__noreturn__)) void* test3_positive(int arg) {
  while (0) foo_test_3();
} // expected-warning{{function declared 'noreturn' should not return}}


// PR5298 - -Wmissing-noreturn shouldn't warn if the function is already
// declared noreturn.
void __attribute__((noreturn))
test4() {
  test2_positive();
}

// Do not warn here.
_Noreturn void test5() {
  test2_positive();
}

// rdar://16274746
void test6()
{
    (void)^{ 
       for(;;)
        ;
     };
}