cmake_modules/FindGHC.cmake
author Wuzzy <Wuzzy2@mail.ru>
Wed, 16 Jan 2019 06:56:38 +0100
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# - Try to find the Glasgow Haskell Compiler executable
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# Once done this will define
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#
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#  GHC_VERSION        - GHC version
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#  GHC_EXECUTABLE     - GHC executable
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#  GHC_PKG_VERSION    - ghc-pkg version
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#  GHC_PKG_EXECUTABLE - ghc-pkg executable
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#
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# Copyright (c) 2013, Vittorio Giovara <vittorio.giovara@gmail.com>
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#
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# Redistribution and use is allowed according to the terms of the BSD license.
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# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
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find_program(GHC_EXECUTABLE
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    NAMES ghc
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    PATHS /opt/local/bin /usr/local/bin /usr/bin
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    )
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find_program(GHC_PKG_EXECUTABLE
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    NAMES ghc-pkg
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    PATHS /opt/local/bin /usr/local/bin /usr/bin
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    )
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if (GHC_EXECUTABLE)
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    # check ghc version
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    execute_process(COMMAND ${GHC_EXECUTABLE} -V
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                    OUTPUT_VARIABLE GHC_VERSION_OUTPUT
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                    ERROR_VARIABLE GHC_VERSION_ERROR
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                    RESULT_VARIABLE GHC_VERSION_RESULT
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                    OUTPUT_STRIP_TRAILING_WHITESPACE
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                    )
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    if(${GHC_VERSION_RESULT} EQUAL 0)
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        string(REGEX MATCH "([0-9]+)" GHC_VERSION ${GHC_VERSION_OUTPUT})
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    else()
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        message(SEND_ERROR "Command \"${GHC_EXECUTABLE} -V\" failed with output: ${GHC_VERSION_ERROR}")
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    endif()
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endif()
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if (GHC_PKG_EXECUTABLE)
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    # check ghc-pkg version
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    execute_process(COMMAND ${GHC_PKG_EXECUTABLE} -V
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                    OUTPUT_VARIABLE GHC_PKG_VERSION_OUTPUT
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                    ERROR_VARIABLE GHC_PKG_VERSION_ERROR
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                    RESULT_VARIABLE GHC_PKG_VERSION_RESULT
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                    OUTPUT_STRIP_TRAILING_WHITESPACE
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                    )
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    if(${GHC_PKG_VERSION_RESULT} EQUAL 0)
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        string(REGEX MATCH "([0-9]+)" GHC_PKG_VERSION ${GHC_PKG_VERSION_OUTPUT})
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    else()
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        message(SEND_ERROR "Command \"${GHC_PKG_EXECUTABLE} -V\" failed with output: ${GHC_PKG_VERSION_ERROR}")
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    endif()
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endif()
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(GHC DEFAULT_MSG GHC_EXECUTABLE GHC_VERSION)
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mark_as_advanced(GHC_VERSION)
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