blob: e1ef17672ccb9b01cf3ff2493f6256f6b62921bc (
plain)
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
|
// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// Test that _LIBCPP_NODISCARD_EXT and _LIBCPP_NODISCARD_AFTER_CXX17 are defined
// to the appropriate warning-generating attribute when _LIBCPP_ENABLE_NODISCARD
// is explicitly provided.
// UNSUPPORTED: c++98, c++03
// GCC 7 is the first version to introduce [[nodiscard]]
// UNSUPPORTED: gcc-4.9, gcc-5, gcc-6
// MODULES_DEFINES: _LIBCPP_ENABLE_NODISCARD
#define _LIBCPP_ENABLE_NODISCARD
#include <__config>
_LIBCPP_NODISCARD_EXT int foo() { return 42; }
_LIBCPP_NODISCARD_AFTER_CXX17 int bar() { return 42; }
int main() {
foo(); // expected-error-re {{ignoring return value of function declared with {{'nodiscard'|warn_unused_result}} attribute}}
bar(); // expected-error-re {{ignoring return value of function declared with {{'nodiscard'|warn_unused_result}} attribute}}
(void)foo(); // OK. void casts disable the diagnostic.
(void)bar();
}
|
