CheckFortran.cmake

# SPDX-FileCopyrightText: Copyright (c) 2009 Kitware Inc.
# SPDX-License-Identifier: BSD-3-Clause
function (check_fortran_support)
  if (DEFINED CMAKE_Fortran_COMPILER)
    return ()
  endif ()

  set(_desc "Looking for a Fortran compiler")
  message(STATUS "${_desc}")
  file(REMOVE_RECURSE "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/CheckFortran")
  file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/CheckFortran/CMakeLists.txt"
    "cmake_minimum_required(VERSION 3.3)
project(CheckFortran Fortran)
file(WRITE \"\${CMAKE_CURRENT_BINARY_DIR}/result.cmake\"
\"set(CMAKE_Fortran_COMPILER \\\"\${CMAKE_Fortran_COMPILER}\\\")\\n\"
\"set(CMAKE_Fortran_FLAGS \\\"\${CMAKE_Fortran_FLAGS}\\\")\\n\")\n")
  execute_process(
    WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/CheckFortran"
    COMMAND "${CMAKE_COMMAND}" . -G "${CMAKE_GENERATOR}"
    OUTPUT_VARIABLE output
    ERROR_VARIABLE output
    RESULT_VARIABLE result)
  include("${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/CheckFortran/result.cmake" OPTIONAL)
  if (CMAKE_Fortran_COMPILER AND NOT result)
    file(APPEND "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log"
      "${_desc} passed with the following output:\n"
      "${output}\n")
  else ()
    set(CMAKE_Fortran_COMPILER NOTFOUND)
    file(APPEND "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log"
      "${_desc} failed with the following output:\n"
      "${output}\n")
  endif ()
  message(STATUS "${_desc} - ${CMAKE_Fortran_COMPILER}")
  set(CMAKE_Fortran_COMPILER "${CMAKE_Fortran_COMPILER}" CACHE FILEPATH "Fortran compiler")
  mark_as_advanced(CMAKE_Fortran_COMPILER)
  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS}" CACHE STRING "Fortran flags")
  mark_as_advanced(CMAKE_Fortran_FLAGS)
endfunction ()