/usr/share/cmake-2.8/Modules/CheckFortranFunctionExists.cmake is in cmake-data 2.8.12.2-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 | # - Check if the Fortran function exists.
# CHECK_FORTRAN_FUNCTION_EXISTS(FUNCTION VARIABLE)
# - macro which checks if the Fortran function exists
#  FUNCTION - the name of the Fortran function
#  VARIABLE - variable to store the result
#
# The following variables may be set before calling this macro to
# modify the way the check is run:
#
#  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
#=============================================================================
# Copyright 2007-2009 Kitware, Inc.
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
#  License text for the above reference.)
macro(CHECK_FORTRAN_FUNCTION_EXISTS FUNCTION VARIABLE)
  if(NOT DEFINED ${VARIABLE})
    message(STATUS "Looking for Fortran ${FUNCTION}")
    if(CMAKE_REQUIRED_LIBRARIES)
      set(CHECK_FUNCTION_EXISTS_ADD_LIBRARIES
        LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
    else()
      set(CHECK_FUNCTION_EXISTS_ADD_LIBRARIES)
    endif()
    file(WRITE
    ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testFortranCompiler.f
    "
      program TESTFortran
      external ${FUNCTION}
      call ${FUNCTION}()
      end program TESTFortran
    "
    )
    try_compile(${VARIABLE}
    ${CMAKE_BINARY_DIR}
    ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testFortranCompiler.f
    ${CHECK_FUNCTION_EXISTS_ADD_LIBRARIES}
    OUTPUT_VARIABLE OUTPUT
    )
#    message(STATUS "${OUTPUT}")
    if(${VARIABLE})
      set(${VARIABLE} 1 CACHE INTERNAL "Have Fortran function ${FUNCTION}")
      message(STATUS "Looking for Fortran ${FUNCTION} - found")
      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
        "Determining if the Fortran ${FUNCTION} exists passed with the following output:\n"
        "${OUTPUT}\n\n")
    else()
      message(STATUS "Looking for Fortran ${FUNCTION} - not found")
      set(${VARIABLE} "" CACHE INTERNAL "Have Fortran function ${FUNCTION}")
      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
        "Determining if the Fortran ${FUNCTION} exists failed with the following output:\n"
        "${OUTPUT}\n\n")
    endif()
  endif()
endmacro()
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