ground/gcs/src/libs/eigen/cmake/language_support.cmake

   1 # cmake/modules/language_support.cmake
   2 #
   3 # Temporary additional general language support is contained within this
   4 # file.
   5
   6 # This additional function definition is needed to provide a workaround for
   7 # CMake bug 9220.
   8
   9 # On debian testing (cmake 2.6.2), I get return code zero when calling
  10 # cmake the first time, but cmake crashes when running a second time
  11 # as follows:
  12 #
  13 #  -- The Fortran compiler identification is unknown
  14 #  CMake Error at /usr/share/cmake-2.6/Modules/CMakeFortranInformation.cmake:7 (GET_FILENAME_COMPONENT):
  15 #    get_filename_component called with incorrect number of arguments
  16 #  Call Stack (most recent call first):
  17 #    CMakeLists.txt:3 (enable_language)
  18 #
  19 # My workaround is to invoke cmake twice.  If both return codes are zero,
  20 # it is safe to invoke ENABLE_LANGUAGE(Fortran OPTIONAL)
  21
  22 function(workaround_9220 language language_works)
  23   #message("DEBUG: language = ${language}")
  24   set(text
  25     "project(test NONE)
  26     cmake_minimum_required(VERSION 2.8.0)
  27     set (CMAKE_Fortran_FLAGS \"${CMAKE_Fortran_FLAGS}\")
  28     set (CMAKE_EXE_LINKER_FLAGS \"${CMAKE_EXE_LINKER_FLAGS}\")
  29     enable_language(${language} OPTIONAL)
  30   ")
  31   file(REMOVE_RECURSE ${CMAKE_BINARY_DIR}/language_tests/${language})
  32   file(MAKE_DIRECTORY ${CMAKE_BINARY_DIR}/language_tests/${language})
  33   file(WRITE ${CMAKE_BINARY_DIR}/language_tests/${language}/CMakeLists.txt
  34     ${text})
  35   execute_process(
  36     COMMAND ${CMAKE_COMMAND} . -G "${CMAKE_GENERATOR}"
  37     WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/language_tests/${language}
  38     RESULT_VARIABLE return_code
  39     OUTPUT_QUIET
  40     ERROR_QUIET
  41     )
  42
  43   if(return_code EQUAL 0)
  44     # Second run
  45     execute_process (
  46       COMMAND ${CMAKE_COMMAND} .
  47       WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/language_tests/${language}
  48       RESULT_VARIABLE return_code
  49       OUTPUT_QUIET
  50       ERROR_QUIET
  51       )
  52     if(return_code EQUAL 0)
  53       set(${language_works} ON PARENT_SCOPE)
  54     else(return_code EQUAL 0)
  55       set(${language_works} OFF PARENT_SCOPE)
  56     endif(return_code EQUAL 0)
  57   else(return_code EQUAL 0)
  58     set(${language_works} OFF PARENT_SCOPE)
  59   endif(return_code EQUAL 0)
  60 endfunction(workaround_9220)
  61
  62 # Temporary tests of the above function.
  63 #workaround_9220(CXX CXX_language_works)
  64 #message("CXX_language_works = ${CXX_language_works}")
  65 #workaround_9220(CXXp CXXp_language_works)
  66 #message("CXXp_language_works = ${CXXp_language_works}")