[libcxx-commits] [libcxx] [libc++][hardening] Add an experimental function to log hardening errors (PR #149452)

[Louis Dionne via libcxx-commits]

================
@@ -0,0 +1,42 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___LOG_HARDENING_FAILURE
+#define _LIBCPP___LOG_HARDENING_FAILURE
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+// Hardening logging is not available in the C++03 mode; moreover, it is currently only available in the experimental
+// library.
+#if _LIBCPP_HAS_EXPERIMENTAL_HARDENING_OBSERVE_SEMANTIC && !defined(_LIBCPP_CXX03_LANG)
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+// This function should never be called directly from the code -- it should only be called through the
+// `_LIBCPP_LOG_HARDENING_FAILURE` macro.
+[[__gnu__::__cold__]] _LIBCPP_EXPORTED_FROM_ABI void __log_hardening_failure(const char* __message) _NOEXCEPT;
----------------
ldionne wrote:

Since this isn't supported in C++03 anyways.

```suggestion
[[__gnu__::__cold__]] _LIBCPP_EXPORTED_FROM_ABI void __log_hardening_failure(const char* __message) noexcept;
```

https://github.com/llvm/llvm-project/pull/149452