Release Cosmopolitan v3.6.0

This release is an atomic upgrade to GCC 14.1.0 with C23 and C++23

third_party/libcxx/optional.cpp

@@ -0,0 +1,36 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include <optional>
+#include <stdexcept>
+
+namespace std {
+
+bad_optional_access::~bad_optional_access() noexcept = default;
+
+const char* bad_optional_access::what() const noexcept { return "bad_optional_access"; }
+
+} // namespace std
+
+#include <experimental/__config>
+
+//  Preserve std::experimental::bad_optional_access for ABI compatibility
+//  Even though it no longer exists in a header file
+_LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL
+
+class _LIBCPP_EXPORTED_FROM_ABI _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS bad_optional_access : public std::logic_error {
+public:
+  bad_optional_access() : std::logic_error("Bad optional Access") {}
+
+  // Get the key function ~bad_optional_access() into the dylib
+  virtual ~bad_optional_access() noexcept;
+};
+
+bad_optional_access::~bad_optional_access() noexcept = default;
+
+_LIBCPP_END_NAMESPACE_EXPERIMENTAL