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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#[=======================================================================[.rst:
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FindBISON
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---------
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Find ``bison`` executable and provide a macro to generate custom build rules.
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The module defines the following variables:
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``BISON_EXECUTABLE``
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path to the ``bison`` program
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``BISON_VERSION``
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version of ``bison``
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``BISON_FOUND``
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"True" if the program was found
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The minimum required version of ``bison`` can be specified using the
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standard CMake syntax, e.g. :command:`find_package(BISON 2.1.3)`.
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If ``bison`` is found, the module defines the macro::
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BISON_TARGET(<Name> <YaccInput> <CodeOutput>
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[COMPILE_FLAGS <flags>]
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[DEFINES_FILE <file>]
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[VERBOSE [<file>]]
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[REPORT_FILE <file>]
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)
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which will create a custom rule to generate a parser. ``<YaccInput>`` is
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the path to a yacc file. ``<CodeOutput>`` is the name of the source file
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generated by bison. A header file is also be generated, and contains
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the token list.
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The options are:
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``COMPILE_FLAGS <flags>``
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Specify flags to be added to the ``bison`` command line.
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``DEFINES_FILE <file>``
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Specify a non-default header ``<file>`` to be generated by ``bison``.
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``VERBOSE [<file>]``
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Tell ``bison`` to write a report file of the grammar and parser.
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If ``<file>`` is given, it specifies path the report file is copied to.
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``[<file>]`` is left for backward compatibility of this module.
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Use ``VERBOSE REPORT_FILE <file>``.
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``REPORT_FILE <file>``
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Specify a non-default report ``<file>``, if generated.
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The macro defines the following variables:
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``BISON_<Name>_DEFINED``
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``True`` is the macro ran successfully
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``BISON_<Name>_INPUT``
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The input source file, an alias for <YaccInput>
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``BISON_<Name>_OUTPUT_SOURCE``
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The source file generated by bison
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``BISON_<Name>_OUTPUT_HEADER``
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The header file generated by bison
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``BISON_<Name>_OUTPUTS``
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All files generated by bison including the source, the header and the report
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``BISON_<Name>_COMPILE_FLAGS``
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Options used in the ``bison`` command line
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Example usage:
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.. code-block:: cmake
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find_package(BISON)
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BISON_TARGET(MyParser parser.y ${CMAKE_CURRENT_BINARY_DIR}/parser.cpp
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DEFINES_FILE ${CMAKE_CURRENT_BINARY_DIR}/parser.h)
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add_executable(Foo main.cpp ${BISON_MyParser_OUTPUTS})
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#]=======================================================================]
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find_program(BISON_EXECUTABLE NAMES bison win-bison win_bison DOC "path to the bison executable")
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mark_as_advanced(BISON_EXECUTABLE)
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if(BISON_EXECUTABLE)
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# the bison commands should be executed with the C locale, otherwise
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# the message (which are parsed) may be translated
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set(_Bison_SAVED_LC_ALL "$ENV{LC_ALL}")
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set(ENV{LC_ALL} C)
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execute_process(COMMAND ${BISON_EXECUTABLE} --version
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OUTPUT_VARIABLE BISON_version_output
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ERROR_VARIABLE BISON_version_error
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RESULT_VARIABLE BISON_version_result
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OUTPUT_STRIP_TRAILING_WHITESPACE)
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set(ENV{LC_ALL} ${_Bison_SAVED_LC_ALL})
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if(NOT ${BISON_version_result} EQUAL 0)
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message(SEND_ERROR "Command \"${BISON_EXECUTABLE} --version\" failed with output:\n${BISON_version_error}")
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else()
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# Bison++
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if("${BISON_version_output}" MATCHES "^bison\\+\\+ Version ([^,]+)")
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set(BISON_VERSION "${CMAKE_MATCH_1}")
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# GNU Bison
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elseif("${BISON_version_output}" MATCHES "^bison \\(GNU Bison\\) ([^\n]+)\n")
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set(BISON_VERSION "${CMAKE_MATCH_1}")
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elseif("${BISON_version_output}" MATCHES "^GNU Bison (version )?([^\n]+)")
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set(BISON_VERSION "${CMAKE_MATCH_2}")
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endif()
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endif()
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# internal macro
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# sets BISON_TARGET_cmdopt
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macro(BISON_TARGET_option_extraopts Options)
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set(BISON_TARGET_cmdopt "")
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set(BISON_TARGET_extraopts "${Options}")
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separate_arguments(BISON_TARGET_extraopts)
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list(APPEND BISON_TARGET_cmdopt ${BISON_TARGET_extraopts})
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endmacro()
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# internal macro
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# sets BISON_TARGET_output_header and BISON_TARGET_cmdopt
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macro(BISON_TARGET_option_defines BisonOutput Header)
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if("${Header}" STREQUAL "")
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# default header path generated by bison (see option -d)
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string(REGEX REPLACE "^(.*)(\\.[^.]*)$" "\\2" _fileext "${BisonOutput}")
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string(REPLACE "c" "h" _fileext ${_fileext})
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string(REGEX REPLACE "^(.*)(\\.[^.]*)$" "\\1${_fileext}"
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BISON_TARGET_output_header "${BisonOutput}")
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list(APPEND BISON_TARGET_cmdopt "-d")
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else()
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set(BISON_TARGET_output_header "${Header}")
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list(APPEND BISON_TARGET_cmdopt "--defines=${BISON_TARGET_output_header}")
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endif()
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endmacro()
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# internal macro
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# sets BISON_TARGET_verbose_file and BISON_TARGET_cmdopt
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macro(BISON_TARGET_option_report_file BisonOutput ReportFile)
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if("${ReportFile}" STREQUAL "")
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get_filename_component(BISON_TARGET_output_path "${BisonOutput}" PATH)
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get_filename_component(BISON_TARGET_output_name "${BisonOutput}" NAME_WE)
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set(BISON_TARGET_verbose_file
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"${BISON_TARGET_output_path}/${BISON_TARGET_output_name}.output")
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else()
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set(BISON_TARGET_verbose_file "${ReportFile}")
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list(APPEND BISON_TARGET_cmdopt "--report-file=${BISON_TARGET_verbose_file}")
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endif()
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if(NOT IS_ABSOLUTE "${BISON_TARGET_verbose_file}")
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cmake_policy(GET CMP0088 _BISON_CMP0088
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PARENT_SCOPE # undocumented, do not use outside of CMake
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)
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if("x${_BISON_CMP0088}x" STREQUAL "xNEWx")
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set(BISON_TARGET_verbose_file "${CMAKE_CURRENT_BINARY_DIR}/${BISON_TARGET_verbose_file}")
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else()
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set(BISON_TARGET_verbose_file "${CMAKE_CURRENT_SOURCE_DIR}/${BISON_TARGET_verbose_file}")
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endif()
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unset(_BISON_CMP0088)
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endif()
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endmacro()
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# internal macro
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# adds a custom command and sets
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# BISON_TARGET_cmdopt, BISON_TARGET_extraoutputs
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macro(BISON_TARGET_option_verbose Name BisonOutput filename)
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cmake_policy(GET CMP0088 _BISON_CMP0088
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PARENT_SCOPE # undocumented, do not use outside of CMake
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)
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set(_BISON_WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
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if("x${_BISON_CMP0088}x" STREQUAL "xNEWx")
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set(_BISON_WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
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endif()
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unset(_BISON_CMP0088)
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list(APPEND BISON_TARGET_cmdopt "--verbose")
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list(APPEND BISON_TARGET_outputs
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"${BISON_TARGET_verbose_file}")
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if (NOT "${filename}" STREQUAL "")
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if(IS_ABSOLUTE "${filename}")
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set(BISON_TARGET_verbose_extra_file "${filename}")
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else()
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set(BISON_TARGET_verbose_extra_file "${_BISON_WORKING_DIRECTORY}/${filename}")
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endif()
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add_custom_command(OUTPUT ${BISON_TARGET_verbose_extra_file}
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COMMAND ${CMAKE_COMMAND} -E copy
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"${BISON_TARGET_verbose_file}"
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"${filename}"
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VERBATIM
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DEPENDS
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"${BISON_TARGET_verbose_file}"
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COMMENT "[BISON][${Name}] Copying bison verbose table to ${filename}"
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WORKING_DIRECTORY ${_BISON_WORKING_DIRECTORY})
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list(APPEND BISON_TARGET_extraoutputs
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"${BISON_TARGET_verbose_extra_file}")
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unset(BISON_TARGET_verbose_extra_file)
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unset(_BISON_WORKING_DIRECTORY)
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endif()
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endmacro()
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#============================================================
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# BISON_TARGET (public macro)
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#============================================================
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#
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macro(BISON_TARGET Name BisonInput BisonOutput)
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set(BISON_TARGET_outputs "${BisonOutput}")
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set(BISON_TARGET_extraoutputs "")
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# Parsing parameters
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set(BISON_TARGET_PARAM_OPTIONS
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)
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set(BISON_TARGET_PARAM_ONE_VALUE_KEYWORDS
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COMPILE_FLAGS
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DEFINES_FILE
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REPORT_FILE
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)
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set(BISON_TARGET_PARAM_MULTI_VALUE_KEYWORDS
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VERBOSE
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)
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cmake_parse_arguments(
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BISON_TARGET_ARG
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"${BISON_TARGET_PARAM_OPTIONS}"
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"${BISON_TARGET_PARAM_ONE_VALUE_KEYWORDS}"
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"${BISON_TARGET_PARAM_MULTI_VALUE_KEYWORDS}"
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${ARGN}
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)
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if(NOT "${BISON_TARGET_ARG_UNPARSED_ARGUMENTS}" STREQUAL "")
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message(SEND_ERROR "Usage")
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elseif("${BISON_TARGET_ARG_VERBOSE}" MATCHES ";")
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# [VERBOSE [<file>] hack: <file> is non-multi value by usage
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message(SEND_ERROR "Usage")
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else()
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BISON_TARGET_option_extraopts("${BISON_TARGET_ARG_COMPILE_FLAGS}")
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BISON_TARGET_option_defines("${BisonOutput}" "${BISON_TARGET_ARG_DEFINES_FILE}")
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BISON_TARGET_option_report_file("${BisonOutput}" "${BISON_TARGET_ARG_REPORT_FILE}")
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if(NOT "${BISON_TARGET_ARG_VERBOSE}" STREQUAL "")
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BISON_TARGET_option_verbose(${Name} ${BisonOutput} "${BISON_TARGET_ARG_VERBOSE}")
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else()
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# [VERBOSE [<file>]] is used with no argument or is not used
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set(BISON_TARGET_args "${ARGN}")
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list(FIND BISON_TARGET_args "VERBOSE" BISON_TARGET_args_indexof_verbose)
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if(${BISON_TARGET_args_indexof_verbose} GREATER -1)
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# VERBOSE is used without <file>
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BISON_TARGET_option_verbose(${Name} ${BisonOutput} "")
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endif()
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endif()
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list(APPEND BISON_TARGET_outputs "${BISON_TARGET_output_header}")
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cmake_policy(GET CMP0088 _BISON_CMP0088
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PARENT_SCOPE # undocumented, do not use outside of CMake
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)
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set(_BISON_WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
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set(_BisonInput "${BisonInput}")
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if("x${_BISON_CMP0088}x" STREQUAL "xNEWx")
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set(_BISON_WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
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if(NOT IS_ABSOLUTE "${_BisonInput}")
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set(_BisonInput "${CMAKE_CURRENT_SOURCE_DIR}/${_BisonInput}")
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endif()
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endif()
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unset(_BISON_CMP0088)
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add_custom_command(OUTPUT ${BISON_TARGET_outputs}
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COMMAND ${BISON_EXECUTABLE} ${BISON_TARGET_cmdopt} -o ${BisonOutput} ${_BisonInput}
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VERBATIM
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DEPENDS ${_BisonInput}
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COMMENT "[BISON][${Name}] Building parser with bison ${BISON_VERSION}"
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WORKING_DIRECTORY ${_BISON_WORKING_DIRECTORY})
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unset(_BISON_WORKING_DIRECTORY)
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# define target variables
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set(BISON_${Name}_DEFINED TRUE)
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set(BISON_${Name}_INPUT ${_BisonInput})
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set(BISON_${Name}_OUTPUTS ${BISON_TARGET_outputs} ${BISON_TARGET_extraoutputs})
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set(BISON_${Name}_COMPILE_FLAGS ${BISON_TARGET_cmdopt})
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set(BISON_${Name}_OUTPUT_SOURCE "${BisonOutput}")
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set(BISON_${Name}_OUTPUT_HEADER "${BISON_TARGET_output_header}")
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unset(_BisonInput)
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endif()
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endmacro()
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#
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#============================================================
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endif()
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include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(BISON REQUIRED_VARS BISON_EXECUTABLE
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VERSION_VAR BISON_VERSION)
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