[CMake][OpenMP] Remove old dead CMake code

[tambre]

Summary

LLVM requires CMake 3.13.4 so remove code behind checks for an older version.

[phosek]

LGTM

openmp/cmake/OpenMPTesting.cmake

if (NOT OPENMP_NOT_EXECUTABLE)
     set(ENABLE_CHECK_TARGETS FALSE PARENT_SCOPE)
     return()
   endif()
 endfunction()
 
 if (${OPENMP_STANDALONE_BUILD})
   find_standalone_test_dependencies()
 
-  # Make sure we can use the console pool for recent CMake and Ninja > 1.5.
-  if (CMAKE_VERSION VERSION_LESS 3.1.20141117)
-    set(cmake_3_2_USES_TERMINAL)
-  else()
-    set(cmake_3_2_USES_TERMINAL USES_TERMINAL)
-  endif()
-
   # Set lit arguments.
   set(DEFAULT_LIT_ARGS "-sv --show-unsupported --show-xfail")
   if (MSVC OR XCODE)
     set(DEFAULT_LIT_ARGS "${DEFAULT_LIT_ARGS} --no-progress-bar")
   endif()
   set(OPENMP_LIT_ARGS "${DEFAULT_LIT_ARGS}" CACHE STRING "Options for lit.")
   separate_arguments(OPENMP_LIT_ARGS)
 else()
function(add_openmp_testsuite target comment)
   endif()
 
   if (${OPENMP_STANDALONE_BUILD})
     set(LIT_ARGS ${OPENMP_LIT_ARGS} ${ARG_ARGS})
     add_custom_target(${target}
       COMMAND ${PYTHON_EXECUTABLE} ${OPENMP_LLVM_LIT_EXECUTABLE} ${LIT_ARGS} ${ARG_UNPARSED_ARGUMENTS}
       COMMENT ${comment}
       DEPENDS ${ARG_DEPENDS}
-      ${cmake_3_2_USES_TERMINAL}
+      USES_TERMINAL
     )
   else()
     if (ARG_EXCLUDE_FROM_CHECK_ALL)
       add_lit_testsuite(${target}
         ${comment}
         ${ARG_UNPARSED_ARGUMENTS}
         EXCLUDE_FROM_CHECK_ALL
         DEPENDS clang clang-resource-headers FileCheck ${ARG_DEPENDS}

openmp/runtime/cmake/LibompCheckFortranFlag.cmake

 function(libomp_check_fortran_flag flag boolean)
   if(NOT DEFINED "${boolean}")
     set(retval TRUE)
     set(fortran_source
 "      program hello
            print *, \"Hello World!\"
       end program hello")
 
     set(failed_regexes "[Ee]rror;[Uu]nknown;[Ss]kipping")
-  if(CMAKE_VERSION VERSION_GREATER 3.1 OR CMAKE_VERSION VERSION_EQUAL 3.1)
     include(CheckFortranSourceCompiles)
     check_fortran_source_compiles("${fortran_source}" ${boolean} FAIL_REGEX "${failed_regexes}")
     set(${boolean} ${${boolean}} PARENT_SCOPE)
-    return()
-  else()
-    # Our manual check for cmake versions that don't have CheckFortranSourceCompiles
-    set(base_dir ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/fortran_flag_check)
-    file(MAKE_DIRECTORY ${base_dir})
-    file(WRITE ${base_dir}/fortran_source.f "${fortran_source}")
-
-    message(STATUS "Performing Test ${boolean}")
-    execute_process(
-      COMMAND ${CMAKE_Fortran_COMPILER} "${flag}" ${base_dir}/fortran_source.f
-      WORKING_DIRECTORY ${base_dir}
-      RESULT_VARIABLE exit_code
-      OUTPUT_VARIABLE OUTPUT
-      ERROR_VARIABLE OUTPUT
-    )
-
-    if(${exit_code} EQUAL 0)
-      foreach(regex IN LISTS failed_regexes)
-        if("${OUTPUT}" MATCHES ${regex})
-          set(retval FALSE)
-        endif()
-      endforeach()
-    else()
-      set(retval FALSE)
-    endif()
-
-    if(${retval})
-      set(${boolean} 1 CACHE INTERNAL "Test ${boolean}")
-      message(STATUS "Performing Test ${boolean} - Success")
-      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
-        "Performing Fortran Compiler Flag test ${boolean} succeeded with the following output:\n"
-        "${OUTPUT}\n"
-        "Source file was:\n${fortran_source}\n")
-    else()
-      set(${boolean} "" CACHE INTERNAL "Test ${boolean}")
-      message(STATUS "Performing Test ${boolean} - Failed")
-      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
-        "Performing Fortran Compiler Flag test ${boolean} failed with the following output:\n"
-        "${OUTPUT}\n"
-        "Source file was:\n${fortran_source}\n")
-    endif()
-  endif()
-
-  set(${boolean} ${retval} PARENT_SCOPE)
   endif()
 endfunction()