File: c2x-maybe_unused.c

package info (click to toggle)
swiftlang 6.1.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 2,791,604 kB
  • sloc: cpp: 9,901,740; ansic: 2,201,431; asm: 1,091,827; python: 308,252; objc: 82,166; f90: 80,126; lisp: 38,358; pascal: 25,559; sh: 20,429; ml: 5,058; perl: 4,745; makefile: 4,484; awk: 3,535; javascript: 3,018; xml: 918; fortran: 664; cs: 573; ruby: 396
file content (45 lines) | stat: -rw-r--r-- 990 bytes parent folder | download | duplicates (16) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
 
// RUN: %clang_cc1 -fsyntax-only -Wunused -std=c2x -verify %s

// This is the latest version of maybe_unused that we support.
_Static_assert(__has_c_attribute(maybe_unused) == 202106L);

struct [[maybe_unused]] S1 { // ok
  int a [[maybe_unused]];
};

enum [[maybe_unused]] E1 {
  EnumVal [[maybe_unused]]
};

[[maybe_unused]] void unused_func([[maybe_unused]] int parm) {
  typedef int maybe_unused_int [[maybe_unused]];
  [[maybe_unused]] int I;
}

void f1(void) {
  int x; // expected-warning {{unused variable}}
  typedef int I; // expected-warning {{unused typedef 'I'}}

  // Should not warn about these due to not being used.
  [[maybe_unused]] int y;
  typedef int maybe_unused_int [[maybe_unused]];

  // Should not warn about these uses.
  struct S1 s;
  maybe_unused_int test;
  y = 12;
}

void f2(void);
[[maybe_unused]] void f2(void);

void f2(void) {
}

void label(void) {
  [[maybe_unused]] label:
  ;

  other_label: // expected-warning {{unused label 'other_label'}}
  ;
}