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