cmake_modules/CheckHaskellPackageExists.cmake
author Wuzzy <Wuzzy2@mail.ru>
Sat, 02 Nov 2019 13:01:28 +0100
changeset 15501 5a30396f8fb2
parent 13291 31615a2e0db1
child 15700 a3d2f69f3ac1
permissions -rw-r--r--
ClimbHome: Change misleading Seed assignment to nil value This was "Seed = ClimbHome", but ClimbHome was a nil value. This code still worked as the engine interpreted the nil value as empty string. But it can be very misleading. This changeset makes the Seed assignment more explicit by assigning the empty string directly. The compability has been tested.

# Checks if a given Haskell package exists (using ghc-pkg)
# and fails if it's missing.
# Loosely based on CheckLibraryExists.cmake from CMake.
#=============================================================================
# Copyright 2002-2009 Kitware, Inc.
#
# Distributed under the OSI-approved BSD License
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================

macro(CHECK_HASKELL_PACKAGE_EXISTS PACKAGE MODULE FUNCTION PARAMCOUNT)
# NOTE: MODULE, FUNCTION and PARAMCOUNT are curretly ignored.
# TODO: Either implement these or drop?

  set(VARIABLE "HS_PACKAGE_${PACKAGE}")
  if(NOT (${VARIABLE} EQUAL "1"))
    message(STATUS "Looking for Haskell package ${PACKAGE} ...")

    execute_process(COMMAND ${GHC_PKG_EXECUTABLE}
                    "latest"
                    ${PACKAGE}
                    "--simple-output"
                    RESULT_VARIABLE COMMAND_RESULT
                    ERROR_VARIABLE BUILD_ERROR
                    OUTPUT_STRIP_TRAILING_WHITESPACE
                    OUTPUT_QUIET
                    )

    if(${COMMAND_RESULT} EQUAL 0)
      message(STATUS "Looking for Haskell package ${PACKAGE} - found")
      set(${VARIABLE} "1" CACHE INTERNAL "Have package ${PACKAGE}")
      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
        "Determining if the Haskell package ${PACKAGE} exists has passed\n\n")
    else()
      message(STATUS "Looking for Haskell package ${PACKAGE} - not found")
      set(${VARIABLE} "0" CACHE INTERNAL "Have package ${PACKAGE}")
      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
        "Determining if the Haskell package ${PACKAGE} "
        "exists failed with the following output:\n"
        "${BUILD_ERROR}\n\n")
      message(FATAL_ERROR "Haskell package '${PACKAGE}' required")
    endif()
  endif()
endmacro()