| // -*- 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(); |
| } |