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35 lines
1.2 KiB
C++
35 lines
1.2 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// Test that _LIBCPP_NODISCARD_EXT and _LIBCPP_NODISCARD_AFTER_CXX17 are defined
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// to the appropriate warning-generating attribute when _LIBCPP_ENABLE_NODISCARD
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// is explicitly provided.
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// UNSUPPORTED: c++98, c++03
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// GCC 7 is the first version to introduce [[nodiscard]]
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// UNSUPPORTED: gcc-4.9, gcc-5, gcc-6
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// MODULES_DEFINES: _LIBCPP_ENABLE_NODISCARD
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#define _LIBCPP_ENABLE_NODISCARD
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#include <__config>
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_LIBCPP_NODISCARD_EXT int foo() { return 42; }
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_LIBCPP_NODISCARD_AFTER_CXX17 int bar() { return 42; }
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int main(int, char**) {
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foo(); // expected-error-re {{ignoring return value of function declared with {{'nodiscard'|warn_unused_result}} attribute}}
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bar(); // expected-error-re {{ignoring return value of function declared with {{'nodiscard'|warn_unused_result}} attribute}}
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(void)foo(); // OK. void casts disable the diagnostic.
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(void)bar();
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return 0;
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}
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