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/* Test C23 noreturn attribute: valid uses. */
/* { dg-do compile } */
/* { dg-options "-std=c23 -pedantic-errors" } */
[[noreturn]] void exit (int);
[[__noreturn__]] int f1 (void);
[[_Noreturn]] void f2 (void);
[[___Noreturn__]] static void f3 (void) { exit (0); }
/* Returning from a noreturn function is undefined at runtime, not a
constraint violation, but recommended practice is to diagnose if
such a return appears possible. */
[[noreturn]] int
f4 (void)
{
return 1; /* { dg-warning "has a 'return' statement" } */
/* { dg-warning "does return" "second warning" { target *-*-* } .-1 } */
}
[[__noreturn__]] void
f5 (void)
{
return; /* { dg-warning "has a 'return' statement" } */
/* { dg-warning "does return" "second warning" { target *-*-* } .-1 } */
}
[[_Noreturn]] void
f6 (void)
{
} /* { dg-warning "does return" } */
[[___Noreturn__]] void
f7 (int a)
{
if (a)
exit (0);
} /* { dg-warning "does return" } */
/* Declarations need not all have the attribute (buf if the first does not,
there is undefined behavior). */
void f2 (void);
/* Duplicate attribute, and use with _Noreturn, is OK. */
[[noreturn]] [[noreturn]] [[noreturn, __noreturn__]] void _Noreturn f9 (void);
/* The attribute does not affect type compatibility. */
void (*fp) (void) = f5;
/* Unlike the function specifier, the attribute may be used on main. */
[[noreturn]] int main ();
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