1 # Checks if a given Haskell package exists (using ghc-pkg)

     2 # and fails if it's missing.

     3 # Loosely based on CheckLibraryExists.cmake from CMake.

     4 #=============================================================================

     5 # Copyright 2002-2009 Kitware, Inc.

     6 #

     7 # Distributed under the OSI-approved BSD License

     8 #

     9 # This software is distributed WITHOUT ANY WARRANTY; without even the

    10 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

    11 # See the License for more information.

    12 #=============================================================================

    13 

    14 macro(CHECK_HASKELL_PACKAGE_EXISTS PACKAGE MODULE FUNCTION PARAMCOUNT)

    15 # NOTE: MODULE, FUNCTION and PARAMCOUNT are curretly ignored.

    16 # TODO: Either implement these or drop?

    17 

    18   set(VARIABLE "HS_PACKAGE_${PACKAGE}")

    19   if(NOT (${VARIABLE} EQUAL "1"))

    20     message(STATUS "Looking for Haskell package ${PACKAGE} ...")

    21 

    22     execute_process(COMMAND ${GHC_PKG_EXECUTABLE}

    23                     "latest"

    24                     ${PACKAGE}

    25                     "--simple-output"

    26                     RESULT_VARIABLE COMMAND_RESULT

    27                     ERROR_VARIABLE BUILD_ERROR

    28                     OUTPUT_STRIP_TRAILING_WHITESPACE

    29                     OUTPUT_QUIET

    30                     )

    31 

    32     if(${COMMAND_RESULT} EQUAL 0)

    33       message(STATUS "Looking for Haskell package ${PACKAGE} - found")

    34       set(${VARIABLE} "1" CACHE INTERNAL "Have package ${PACKAGE}")

    35       file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log

    36         "Determining if the Haskell package ${PACKAGE} exists has passed\n\n")

    37     else()

    38       message(STATUS "Looking for Haskell package ${PACKAGE} - not found")

    39       set(${VARIABLE} "0" CACHE INTERNAL "Have package ${PACKAGE}")

    40       file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log

    41         "Determining if the Haskell package ${PACKAGE} "

    42         "exists failed with the following output:\n"

    43         "${BUILD_ERROR}\n\n")

    44       message(FATAL_ERROR "Haskell package '${PACKAGE}' required")

    45     endif()

    46   endif()

    47 endmacro()