Skeleton for applying deprecation warnings

src/catch2/internal/catch_deprecation_macro.hpp

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+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+#ifndef CATCH_DEPRECATION_MACRO_HPP_INCLUDED
+#define CATCH_DEPRECATION_MACRO_HPP_INCLUDED
+
+#include <catch2/catch_user_config.hpp>
+
+#if !defined( CATCH_CONFIG_NO_DEPRECATION_ANNOTATIONS )
+#    define DEPRECATED( msg ) [[deprecated( msg )]]
+#else
+#    define DEPRECATED( msg )
+#endif
+
+#endif // CATCH_DEPRECATION_MACRO_HPP_INCLUDED