#
# Copyright (C) 2018 by George Cave - gcave@stablecoder.ca
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.

# Set the compiler standard to C++11
macro(cxx_11)
  set(CMAKE_CXX_STANDARD 11)
  set(CMAKE_CXX_STANDARD_REQUIRED ON)
  set(CMAKE_CXX_EXTENSIONS OFF)

  if(MSVC_VERSION GREATER_EQUAL "1900" AND CMAKE_VERSION LESS 3.10)
    include(CheckCXXCompilerFlag)
    check_cxx_compiler_flag("/std:c++11" _cpp_latest_flag_supported)
    if(_cpp_latest_flag_supported)
      add_compile_options("/std:c++11")
    endif()
  endif()
endmacro()

# Set the compiler standard to C++14
macro(cxx_14)
  set(CMAKE_CXX_STANDARD 14)
  set(CMAKE_CXX_STANDARD_REQUIRED ON)
  set(CMAKE_CXX_EXTENSIONS OFF)

  if(MSVC_VERSION GREATER_EQUAL "1900" AND CMAKE_VERSION LESS 3.10)
    include(CheckCXXCompilerFlag)
    check_cxx_compiler_flag("/std:c++14" _cpp_latest_flag_supported)
    if(_cpp_latest_flag_supported)
      add_compile_options("/std:c++14")
    endif()
  endif()
endmacro()

# Set the compiler standard to C++17
macro(cxx_17)
  set(CMAKE_CXX_STANDARD 17)
  set(CMAKE_CXX_STANDARD_REQUIRED ON)
  set(CMAKE_CXX_EXTENSIONS OFF)

  if(MSVC_VERSION GREATER_EQUAL "1900" AND CMAKE_VERSION LESS 3.10)
    include(CheckCXXCompilerFlag)
    check_cxx_compiler_flag("/std:c++17" _cpp_latest_flag_supported)
    if(_cpp_latest_flag_supported)
      add_compile_options("/std:c++17")
    endif()
  endif()
endmacro()

# Set the compiler standard to C++20
macro(cxx_20)
  set(CMAKE_CXX_STANDARD 20)
  set(CMAKE_CXX_STANDARD_REQUIRED ON)
  set(CMAKE_CXX_EXTENSIONS OFF)
  if(MSVC_VERSION GREATER_EQUAL "1900")
    include(CheckCXXCompilerFlag)
    check_cxx_compiler_flag("/std:c++latest" _cpp_latest_flag_supported)
    if(_cpp_latest_flag_supported)
      add_compile_options("/std:c++latest")
    endif()
  endif()
  if((CMAKE_CXX_COMPILER_ID MATCHES "Clang") OR (CMAKE_CXX_COMPILER_ID MATCHES "GNU"))
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++20")
  endif()
endmacro()
