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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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FindFLEX
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--------
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Find Fast Lexical Analyzer (Flex) executable and provides a macro
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to generate custom build rules
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The module defines the following variables:
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::
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FLEX_FOUND - True is flex executable is found
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FLEX_EXECUTABLE - the path to the flex executable
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FLEX_VERSION - the version of flex
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FLEX_LIBRARIES - The flex libraries
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FLEX_INCLUDE_DIRS - The path to the flex headers
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The minimum required version of flex can be specified using the
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standard syntax, e.g. :command:`find_package(FLEX 2.5.13)`
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If flex is found on the system, the module provides the macro:
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::
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FLEX_TARGET(Name FlexInput FlexOutput
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[COMPILE_FLAGS <string>]
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[DEFINES_FILE <string>]
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)
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which creates a custom command to generate the ``FlexOutput`` file from
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the ``FlexInput`` file. If ``COMPILE_FLAGS`` option is specified, the next
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parameter is added to the flex command line. If flex is configured to
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output a header file, the ``DEFINES_FILE`` option may be used to specify its
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name. Name is an alias used to get details of this custom command.
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Indeed the macro defines the following variables:
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::
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FLEX_${Name}_DEFINED - true is the macro ran successfully
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FLEX_${Name}_OUTPUTS - the source file generated by the custom rule, an
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alias for FlexOutput
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FLEX_${Name}_INPUT - the flex source file, an alias for ${FlexInput}
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FLEX_${Name}_OUTPUT_HEADER - the header flex output, if any.
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Flex scanners often use tokens defined by Bison: the code generated
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by Flex depends of the header generated by Bison. This module also
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defines a macro:
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::
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ADD_FLEX_BISON_DEPENDENCY(FlexTarget BisonTarget)
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which adds the required dependency between a scanner and a parser
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where ``FlexTarget`` and ``BisonTarget`` are the first parameters of
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respectively ``FLEX_TARGET`` and ``BISON_TARGET`` macros.
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::
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====================================================================
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Example:
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::
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find_package(BISON)
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find_package(FLEX)
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::
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BISON_TARGET(MyParser parser.y ${CMAKE_CURRENT_BINARY_DIR}/parser.cpp)
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FLEX_TARGET(MyScanner lexer.l ${CMAKE_CURRENT_BINARY_DIR}/lexer.cpp)
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ADD_FLEX_BISON_DEPENDENCY(MyScanner MyParser)
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::
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include_directories(${CMAKE_CURRENT_BINARY_DIR})
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add_executable(Foo
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Foo.cc
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${BISON_MyParser_OUTPUTS}
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${FLEX_MyScanner_OUTPUTS}
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)
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target_link_libraries(Foo ${FLEX_LIBRARIES})
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====================================================================
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#]=======================================================================]
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find_program(FLEX_EXECUTABLE NAMES flex win-flex win_flex DOC "path to the flex executable")
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mark_as_advanced(FLEX_EXECUTABLE)
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find_library(FL_LIBRARY NAMES fl
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DOC "Path to the fl library")
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find_path(FLEX_INCLUDE_DIR FlexLexer.h
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DOC "Path to the flex headers")
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mark_as_advanced(FL_LIBRARY FLEX_INCLUDE_DIR)
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set(FLEX_INCLUDE_DIRS ${FLEX_INCLUDE_DIR})
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set(FLEX_LIBRARIES ${FL_LIBRARY})
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if(FLEX_EXECUTABLE)
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execute_process(COMMAND ${FLEX_EXECUTABLE} --version
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OUTPUT_VARIABLE FLEX_version_output
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ERROR_VARIABLE FLEX_version_error
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RESULT_VARIABLE FLEX_version_result
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OUTPUT_STRIP_TRAILING_WHITESPACE)
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if(NOT ${FLEX_version_result} EQUAL 0)
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if(FLEX_FIND_REQUIRED)
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message(SEND_ERROR "Command \"${FLEX_EXECUTABLE} --version\" failed with output:\n${FLEX_version_output}\n${FLEX_version_error}")
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else()
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message("Command \"${FLEX_EXECUTABLE} --version\" failed with output:\n${FLEX_version_output}\n${FLEX_version_error}\nFLEX_VERSION will not be available")
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endif()
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else()
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# older versions of flex printed "/full/path/to/executable version X.Y"
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# newer versions use "basename(executable) X.Y"
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get_filename_component(FLEX_EXE_NAME_WE "${FLEX_EXECUTABLE}" NAME_WE)
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get_filename_component(FLEX_EXE_EXT "${FLEX_EXECUTABLE}" EXT)
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string(REGEX REPLACE "^.*${FLEX_EXE_NAME_WE}(${FLEX_EXE_EXT})?\"? (version )?([0-9]+[^ ]*)( .*)?$" "\\3"
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FLEX_VERSION "${FLEX_version_output}")
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unset(FLEX_EXE_EXT)
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unset(FLEX_EXE_NAME_WE)
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endif()
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#============================================================
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# FLEX_TARGET (public macro)
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#============================================================
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#
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macro(FLEX_TARGET Name Input Output)
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set(FLEX_TARGET_PARAM_OPTIONS)
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set(FLEX_TARGET_PARAM_ONE_VALUE_KEYWORDS
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COMPILE_FLAGS
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DEFINES_FILE
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)
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set(FLEX_TARGET_PARAM_MULTI_VALUE_KEYWORDS)
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cmake_parse_arguments(
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FLEX_TARGET_ARG
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"${FLEX_TARGET_PARAM_OPTIONS}"
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"${FLEX_TARGET_PARAM_ONE_VALUE_KEYWORDS}"
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"${FLEX_TARGET_MULTI_VALUE_KEYWORDS}"
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${ARGN}
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)
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set(FLEX_TARGET_usage "FLEX_TARGET(<Name> <Input> <Output> [COMPILE_FLAGS <string>] [DEFINES_FILE <string>]")
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if(NOT "${FLEX_TARGET_ARG_UNPARSED_ARGUMENTS}" STREQUAL "")
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message(SEND_ERROR ${FLEX_TARGET_usage})
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else()
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cmake_policy(GET CMP0098 _flex_CMP0098
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PARENT_SCOPE # undocumented, do not use outside of CMake
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)
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set(_flex_INPUT "${Input}")
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if("x${_flex_CMP0098}x" STREQUAL "xNEWx")
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set(_flex_WORKING_DIR "${CMAKE_CURRENT_BINARY_DIR}")
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if(NOT IS_ABSOLUTE "${_flex_INPUT}")
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set(_flex_INPUT "${CMAKE_CURRENT_SOURCE_DIR}/${_flex_INPUT}")
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endif()
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else()
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set(_flex_WORKING_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
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endif()
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unset(_flex_CMP0098)
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set(_flex_OUTPUT "${Output}")
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if(NOT IS_ABSOLUTE ${_flex_OUTPUT})
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set(_flex_OUTPUT "${_flex_WORKING_DIR}/${_flex_OUTPUT}")
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endif()
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set(_flex_TARGET_OUTPUTS "${_flex_OUTPUT}")
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set(_flex_EXE_OPTS "")
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if(NOT "${FLEX_TARGET_ARG_COMPILE_FLAGS}" STREQUAL "")
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set(_flex_EXE_OPTS "${FLEX_TARGET_ARG_COMPILE_FLAGS}")
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separate_arguments(_flex_EXE_OPTS)
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endif()
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set(_flex_OUTPUT_HEADER "")
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if(NOT "${FLEX_TARGET_ARG_DEFINES_FILE}" STREQUAL "")
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set(_flex_OUTPUT_HEADER "${FLEX_TARGET_ARG_DEFINES_FILE}")
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if(IS_ABSOLUTE "${_flex_OUTPUT_HEADER}")
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set(_flex_OUTPUT_HEADER_ABS "${_flex_OUTPUT_HEADER}")
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else()
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set(_flex_OUTPUT_HEADER_ABS "${_flex_WORKING_DIR}/${_flex_OUTPUT_HEADER}")
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endif()
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list(APPEND _flex_TARGET_OUTPUTS "${_flex_OUTPUT_HEADER_ABS}")
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list(APPEND _flex_EXE_OPTS --header-file=${_flex_OUTPUT_HEADER_ABS})
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endif()
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get_filename_component(_flex_EXE_NAME_WE "${FLEX_EXECUTABLE}" NAME_WE)
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add_custom_command(OUTPUT ${_flex_TARGET_OUTPUTS}
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COMMAND ${FLEX_EXECUTABLE} ${_flex_EXE_OPTS} -o${_flex_OUTPUT} ${_flex_INPUT}
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VERBATIM
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DEPENDS ${_flex_INPUT}
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COMMENT "[FLEX][${Name}] Building scanner with ${_flex_EXE_NAME_WE} ${FLEX_VERSION}"
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WORKING_DIRECTORY ${_flex_WORKING_DIR})
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set(FLEX_${Name}_DEFINED TRUE)
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set(FLEX_${Name}_OUTPUTS ${_flex_TARGET_OUTPUTS})
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set(FLEX_${Name}_INPUT ${_flex_INPUT})
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set(FLEX_${Name}_COMPILE_FLAGS ${_flex_EXE_OPTS})
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set(FLEX_${Name}_OUTPUT_HEADER ${_flex_OUTPUT_HEADER})
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unset(_flex_EXE_NAME_WE)
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unset(_flex_EXE_OPTS)
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unset(_flex_INPUT)
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unset(_flex_OUTPUT)
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unset(_flex_OUTPUT_HEADER)
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unset(_flex_OUTPUT_HEADER_ABS)
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unset(_flex_TARGET_OUTPUTS)
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unset(_flex_WORKING_DIR)
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endif()
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endmacro()
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#============================================================
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#============================================================
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# ADD_FLEX_BISON_DEPENDENCY (public macro)
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#============================================================
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#
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macro(ADD_FLEX_BISON_DEPENDENCY FlexTarget BisonTarget)
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if(NOT FLEX_${FlexTarget}_OUTPUTS)
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message(SEND_ERROR "Flex target `${FlexTarget}' does not exist.")
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endif()
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if(NOT BISON_${BisonTarget}_OUTPUT_HEADER)
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message(SEND_ERROR "Bison target `${BisonTarget}' does not exist.")
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endif()
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set_source_files_properties(${FLEX_${FlexTarget}_OUTPUTS}
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PROPERTIES OBJECT_DEPENDS ${BISON_${BisonTarget}_OUTPUT_HEADER})
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endmacro()
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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(FLEX REQUIRED_VARS FLEX_EXECUTABLE
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VERSION_VAR FLEX_VERSION)
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