d1a461dbb2
Picolibc does not provide the clock_gettime function nor the "rt" library.
check_library_exists was invalidly detecting the "rt" library due to cmake issue
present, when cross-compiling[1]. This resulted with "chrono.cpp" trying to link
to the "rt" library and following error:
unable to find library from dependent library specifier: rt
[1] https://gitlab.kitware.com/cmake/cmake/-/issues/18121
66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// UNSUPPORTED: availability-filesystem-missing
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// <chrono>
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//
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// file_clock
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//
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// template<class Duration>
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// static sys_time<see-below> to_sys(const file_time<Duration>&);
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//
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// template<class Duration>
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// static file_time<see-below> from_sys(const sys_time<Duration>&);
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#include <chrono>
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#include <cassert>
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int main(int, char**) {
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// Test round-trip through the system clock, starting from file_clock::now()
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{
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std::chrono::file_clock::time_point const ft = std::chrono::file_clock::now();
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auto st = std::chrono::file_clock::to_sys(ft);
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assert(ft == std::chrono::file_clock::from_sys(st));
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}
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// Test round-trip through the system clock, starting from system_clock::now()
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{
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std::chrono::system_clock::time_point const st = std::chrono::system_clock::now();
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auto ft = std::chrono::file_clock::from_sys(st);
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assert(st == std::chrono::file_clock::to_sys(ft));
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}
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// Make sure the value we get is in the ballpark of something reasonable
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{
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std::chrono::file_clock::time_point const file_now = std::chrono::file_clock::now();
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std::chrono::system_clock::time_point const sys_now = std::chrono::system_clock::now();
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{
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auto diff = sys_now - std::chrono::file_clock::to_sys(file_now);
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assert(std::chrono::milliseconds(-500) < diff && diff < std::chrono::milliseconds(500));
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}
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{
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auto diff = std::chrono::file_clock::from_sys(sys_now) - file_now;
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assert(std::chrono::milliseconds(-500) < diff && diff < std::chrono::milliseconds(500));
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}
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}
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// Make sure to_sys and from_sys are consistent with each other
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{
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std::chrono::file_clock::time_point const ft = std::chrono::file_clock::now();
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std::chrono::system_clock::time_point const st = std::chrono::system_clock::now();
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auto sys_diff = std::chrono::file_clock::to_sys(ft) - st;
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auto file_diff = ft - std::chrono::file_clock::from_sys(st);
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assert(sys_diff == file_diff);
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}
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return 0;
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}
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