[llvm-branch-commits] [libcxx] [libc++][chrono] Loads leap-seconds.list in tzdb. (PR #82113)

[Louis Dionne via llvm-branch-commits]

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+// -*- 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 SUPPORT_TEST_CHRONO_LEAP_SECOND_HPP
+#define SUPPORT_TEST_CHRONO_LEAP_SECOND_HPP
+
+/**
+ * @file Helper functions to create a @ref std::chrono::leap_second.
+ *
+ * Since the standard doesn't specify how a @ref std::chrono::leap_second is
+ * constructed this is implementation defined. To make the public API tests of
+ * the class generic this header defines helper functions to create the
+ * required object.
+ *
+ * @note This requires every standard library implementation to write their own
+ * helper function. Vendors are encouraged to create a pull request at
+ * https://github.com/llvm/llvm-project so their specific implementation can be
+ * part of this file.
+ */
+
+#include "test_macros.h"
+
+#if TEST_STD_VER < 20
+#  error "The format header requires at least C++20"
+#endif
+
+#include <chrono>
+
+#ifdef _LIBCPP_VERSION
+
+// In order to find this include the calling test needs to provide this path in
+// the search path. Typically this looks like:
+//   REMOVE_THIS_PREFIX__ADDITIONAL_COMPILE_FLAGS(stdlib=libc++): -I %S/../../../../../../src/include
+// where the number of `../` sequences depends on the subdirectory level of the
+// test.
+#  include "tzdb/leap_second_private.h" // Header in the dylib
+
+inline constexpr std::chrono::leap_second
+test_leap_second_create(const std::chrono::sys_seconds& date, const std::chrono::seconds& value) {
+  return std::chrono::leap_second{std::chrono::leap_second::__constructor_tag{}, date, value};
+}
+
+#else // _LIBCPP_VERSION
+#  error "Please create a vendor specific version of the test functions and file a review at https://reviews.llvm.org/"
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ldionne wrote:

This link is outdated now.

https://github.com/llvm/llvm-project/pull/82113