Update CMake code to 3.18 minimum version (#2080)

* Update CMake code to 3.18 minimum version

* Updated release note

1 files changed, 10 insertions, 95 deletions

diff --git a/config/cmake/HDFUseFortran.cmake b/config/cmake/HDFUseFortran.cmake
index c96298f..61adffd 100644
--- a/config/cmake/HDFUseFortran.cmake
+++ b/config/cmake/HDFUseFortran.cmake
@@ -16,10 +16,8 @@
 enable_language (Fortran)
 set (HDF_PREFIX "H5")
 
-if (NOT CMAKE_VERSION VERSION_LESS "3.14.0")
-  include (CheckFortranSourceRuns)
-  include (CheckFortranSourceCompiles)
-endif ()
+include (CheckFortranSourceRuns)
+include (CheckFortranSourceCompiles)
 
 #-------------------------------------------------------------------------------
 #  Fix Fortran flags if we are compiling statically on Windows using
@@ -119,98 +117,15 @@ set (ISO_C_BINDING_CODE
   "
 )
 
-if (NOT CMAKE_VERSION VERSION_LESS "3.14.0")
-  if (HDF5_REQUIRED_LIBRARIES)
-    set (CMAKE_REQUIRED_LIBRARIES "${HDF5_REQUIRED_LIBRARIES}")
-  endif ()
-  check_fortran_source_compiles (${SIZEOF_CODE} ${HDF_PREFIX}_FORTRAN_HAVE_SIZEOF SRC_EXT f90)
-  check_fortran_source_compiles (${C_SIZEOF_CODE} ${HDF_PREFIX}_FORTRAN_HAVE_C_SIZEOF SRC_EXT f90)
-  check_fortran_source_compiles (${STORAGE_SIZE_CODE} ${HDF_PREFIX}_FORTRAN_HAVE_STORAGE_SIZE SRC_EXT f90)
-  check_fortran_source_compiles (${ISO_FORTRAN_ENV_CODE} ${HDF_PREFIX}_HAVE_ISO_FORTRAN_ENV SRC_EXT f90)
-  check_fortran_source_compiles (${REALISNOTDOUBLE_CODE} ${HDF_PREFIX}_FORTRAN_DEFAULT_REAL_NOT_DOUBLE SRC_EXT f90)
-  check_fortran_source_compiles (${ISO_C_BINDING_CODE} ${HDF_PREFIX}_FORTRAN_HAVE_ISO_C_BINDING SRC_EXT f90)
-else ()
-  #-----------------------------------------------------------------------------
-  # The provided CMake Fortran macros don't provide a general check function
-  # so this one is used for a sizeof test.
-  #-----------------------------------------------------------------------------
-  macro (CHECK_FORTRAN_FEATURE FUNCTION CODE VARIABLE)
-      if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-        message (VERBOSE "Testing Fortran ${FUNCTION}")
-      endif ()
-      if (HDF5_REQUIRED_LIBRARIES)
-        set (CHECK_FUNCTION_EXISTS_ADD_LIBRARIES
-            "-DLINK_LIBRARIES:STRING=${HDF5_REQUIRED_LIBRARIES}")
-      else ()
-        set (CHECK_FUNCTION_EXISTS_ADD_LIBRARIES)
-      endif ()
-      file (WRITE
-          ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testFortranCompiler.f90
-          "${CODE}"
-      )
-      TRY_COMPILE (RESULT_VAR
-          ${CMAKE_BINARY_DIR}
-          ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testFortranCompiler.f90
-          CMAKE_FLAGS "${CHECK_FUNCTION_EXISTS_ADD_LIBRARIES}"
-          OUTPUT_VARIABLE OUTPUT
-      )
-
-  #    if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-  #      message (TRACE "* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ")
-  #      message (TRACE "Test result ${OUTPUT}")
-  #      message (TRACE "* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ")
-  #    endif ()
-
-      if (${RESULT_VAR})
-        set (${VARIABLE} 1 CACHE INTERNAL "Have Fortran function ${FUNCTION}")
-        if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-          message (VERBOSE "Testing Fortran ${FUNCTION} - OK")
-        endif ()
-        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 "Testing Fortran ${FUNCTION} - Fail")
-        set (${VARIABLE} 0 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 ()
-  endmacro ()
-
-  #-----------------------------------------------------------------------------
-  # Configure Checks which require Fortran compilation must go in here
-  # not in the main ConfigureChecks.cmake files, because if the user has
-  # no Fortran compiler, problems arise.
-  #
-  # Be careful with leading spaces here, do not remove them.
-  #-----------------------------------------------------------------------------
-
-  # Check for Non-standard extension intrinsic function SIZEOF
-  set (${HDF_PREFIX}_FORTRAN_HAVE_SIZEOF FALSE)
-  CHECK_FORTRAN_FEATURE(sizeof_code ${SIZEOF_CODE} ${HDF_PREFIX}_FORTRAN_HAVE_SIZEOF)
-
-  # Check for F2008 standard intrinsic function C_SIZEOF
-  set (${HDF_PREFIX}_FORTRAN_HAVE_C_SIZEOF FALSE)
-  CHECK_FORTRAN_FEATURE(c_sizeof_code ${C_SIZEOF_CODE} ${HDF_PREFIX}_FORTRAN_HAVE_C_SIZEOF)
-
-  # Check for F2008 standard intrinsic function STORAGE_SIZE
-  CHECK_FORTRAN_FEATURE(storage_size_code ${STORAGE_SIZE_CODE} ${HDF_PREFIX}_FORTRAN_HAVE_STORAGE_SIZE)
-
-  # Check for F2008 standard intrinsic module "ISO_FORTRAN_ENV"
-  set (${HDF_PREFIX}_HAVE_ISO_FORTRAN_ENV FALSE)
-  CHECK_FORTRAN_FEATURE(iso_fortran_env_code ${ISO_FORTRAN_ENV_CODE} ${HDF_PREFIX}_HAVE_ISO_FORTRAN_ENV)
-
-  set (${HDF_PREFIX}_FORTRAN_DEFAULT_REAL_NOT_DOUBLE FALSE)
-  CHECK_FORTRAN_FEATURE(realisnotdouble_code ${REALISNOTDOUBLE_CODE} ${HDF_PREFIX}_FORTRAN_DEFAULT_REAL_NOT_DOUBLE)
-
-  #-----------------------------------------------------------------------------
-  # Checks if the ISO_C_BINDING module meets all the requirements
-  #-----------------------------------------------------------------------------
-  set (${HDF_PREFIX}_FORTRAN_HAVE_ISO_C_BINDING FALSE)
-  CHECK_FORTRAN_FEATURE(iso_c_binding_code ${ISO_C_BINDING_CODE} ${HDF_PREFIX}_FORTRAN_HAVE_ISO_C_BINDING)
+if (HDF5_REQUIRED_LIBRARIES)
+  set (CMAKE_REQUIRED_LIBRARIES "${HDF5_REQUIRED_LIBRARIES}")
 endif ()
+check_fortran_source_compiles (${SIZEOF_CODE} ${HDF_PREFIX}_FORTRAN_HAVE_SIZEOF SRC_EXT f90)
+check_fortran_source_compiles (${C_SIZEOF_CODE} ${HDF_PREFIX}_FORTRAN_HAVE_C_SIZEOF SRC_EXT f90)
+check_fortran_source_compiles (${STORAGE_SIZE_CODE} ${HDF_PREFIX}_FORTRAN_HAVE_STORAGE_SIZE SRC_EXT f90)
+check_fortran_source_compiles (${ISO_FORTRAN_ENV_CODE} ${HDF_PREFIX}_HAVE_ISO_FORTRAN_ENV SRC_EXT f90)
+check_fortran_source_compiles (${REALISNOTDOUBLE_CODE} ${HDF_PREFIX}_FORTRAN_DEFAULT_REAL_NOT_DOUBLE SRC_EXT f90)
+check_fortran_source_compiles (${ISO_C_BINDING_CODE} ${HDF_PREFIX}_FORTRAN_HAVE_ISO_C_BINDING SRC_EXT f90)
 
 #-----------------------------------------------------------------------------
 # Add debug information (intel Fortran : JB)