cpfm/cmake/Modules/FindHinnantDate.cmake

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2018-01-11 21:47:59 +01:00
#.rst:
# FindHinnantDate
# ---------------
#
# This module finds Howard Hinnant's date and time library for C++11 and beyond
# See https://github.com/HowardHinnant/date for details.
#
# This will define the following variables::
#
# HinnantDate_FOUND - True if the system has the library
# HinnantDate_INCLUDE_DIR - The directory which includes the header
# HinnantDate_ROOT_DIR - The base directory of the library
#
# and the following imported targets::
#
# HinnantDate::Date - The target to use date.h
#
# You can set HinnantDate_ROOT_DIR as hint to the location of the library.
#
# The target will enable the required C++11 standard in your compiler. You can
# use any later standard but you have to enable them explicitly.
# Copyright (c) 2016 Christian Dávid
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
cmake_minimum_required(VERSION 3.1)
# ensure cache entry
set(HinnantDate_ROOT_DIR "${HinnantDate_ROOT_DIR}" CACHE PATH "Root directory of Howard Hinnant's date library")
set(HinnantDate_NOT_FOUND_MESSAGE "Could NOT find HinnantDate.
Maybe you need to adjust the search paths or HinnantDate_ROOT_DIR.")
find_file(HinnantDate_INCLUDE_FILE
date.h date/date.h include/date/date.h
HINTS
${HinnantDate_ROOT_DIR}
${HinnantDate_ROOT_DIR}/include
)
mark_as_advanced(HinnantDate_INCLUDE_FILE)
if (HinnantDate_INCLUDE_FILE)
# Validate that correct file is found
file(STRINGS ${HinnantDate_INCLUDE_FILE} check_result
LIMIT_COUNT 1
REGEX "^ *// Copyright [(]c[)] 2015.* Howard Hinnant *$"
)
if("${check_result}" STREQUAL "")
string(APPEND HinnantDate_NOT_FOUND_MESSAGE "\nRejecting found '${HinnantDate_INCLUDE_FILE}', it seems to be a name twin.")
unset(HinnantDate_INCLUDE_FILE CACHE)
else()
# Check succeeded, create target
get_filename_component(HinnantDate_INCLUDE_DIR "${HinnantDate_INCLUDE_FILE}" DIRECTORY CACHE)
mark_as_advanced(HinnantDate_INCLUDE_DIR)
set(HinnantDate_ROOT_DIR "${HinnantDate_INCLUDE_DIR}")
unset(HinnantDate_NOT_FOUND_MESSAGE)
if(NOT TARGET HinnantDate::Date)
add_library(HinnantDate::Date INTERFACE IMPORTED)
set_target_properties(HinnantDate::Date PROPERTIES
INTERFACE_INCLUDE_DIRECTORIES "${HinnantDate_INCLUDE_DIR}"
INTERFACE_COMPILE_FEATURES "cxx_auto_type;cxx_static_assert;cxx_decltype;cxx_alias_templates;cxx_strong_enums"
# Due to cmake restrictions the standard cannot be set directly to interface imported targets. Instead required compile
# features are set (list maybe incomplete). Please note that this list shall be a minimal set of required features.
# CXX_STANDARD 11
# CXX_STANDARD_REQUIRED true
)
endif()
endif()
endif()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(HinnantDate
REQUIRED_VARS HinnantDate_ROOT_DIR HinnantDate_INCLUDE_DIR
FAIL_MESSAGE ${HinnantDate_NOT_FOUND_MESSAGE}
)