cmake_modules/CheckHaskellPackageExists.cmake
author sheepluva
Sun, 08 Dec 2019 02:09:19 +0100
branchhedgeroid
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hedgeroid/frontlib: update proto and weapons number
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# Checks if a given Haskell package exists (using ghc-pkg)
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# and fails if it's missing.
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# Loosely based on CheckLibraryExists.cmake from CMake.
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#=============================================================================
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# Copyright 2002-2009 Kitware, Inc.
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#
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# Distributed under the OSI-approved BSD License
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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macro(CHECK_HASKELL_PACKAGE_EXISTS PACKAGE MODULE FUNCTION PARAMCOUNT)
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# NOTE: MODULE, FUNCTION and PARAMCOUNT are curretly ignored.
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# TODO: Either implement these or drop?
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  set(VARIABLE "HS_PACKAGE_${PACKAGE}")
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  if(NOT (${VARIABLE} EQUAL "1"))
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    message(STATUS "Looking for Haskell package ${PACKAGE} ...")
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    execute_process(COMMAND ${GHC_PKG_EXECUTABLE}
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                    "latest"
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                    ${PACKAGE}
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                    "--simple-output"
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                    RESULT_VARIABLE COMMAND_RESULT
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                    ERROR_VARIABLE BUILD_ERROR
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                    OUTPUT_STRIP_TRAILING_WHITESPACE
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                    OUTPUT_QUIET
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                    )
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    if(${COMMAND_RESULT} EQUAL 0)
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      message(STATUS "Looking for Haskell package ${PACKAGE} - found")
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      set(${VARIABLE} "1" CACHE INTERNAL "Have package ${PACKAGE}")
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      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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        "Determining if the Haskell package ${PACKAGE} exists has passed\n\n")
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    else()
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      message(STATUS "Looking for Haskell package ${PACKAGE} - not found")
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      set(${VARIABLE} "0" CACHE INTERNAL "Have package ${PACKAGE}")
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      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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        "Determining if the Haskell package ${PACKAGE} "
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        "exists failed with the following output:\n"
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        "${BUILD_ERROR}\n\n")
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      message(FATAL_ERROR "Haskell package '${PACKAGE}' required")
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    endif()
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  endif()
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endmacro()