25 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: no-threads10 11// This test ensures that we don't hijack the <stdatomic.h> header (e.g. by providing12// an empty header) even when compiling before C++23, since some users were using the13// Clang or platform provided header before libc++ added its own.14 15// On GCC, the compiler-provided <stdatomic.h> is not C++ friendly, so including <stdatomic.h>16// doesn't work at all if we don't use the <stdatomic.h> provided by libc++ in C++23 and above.17// XFAIL: (c++11 || c++14 || c++17 || c++20) && gcc18 19#include <stdatomic.h>20 21void f() {22 atomic_int i; // just make sure the header isn't empty23 (void)i;24}25