# - Find flex executable and provides a macro to generate custom build rules # # The module defines the following variables: # FLEX_FOUND - true is flex executable is found # FLEX_EXECUTABLE - the path to the flex executable # FLEX_VERSION - the version of flex # FLEX_LIBRARIES - The flex libraries # FLEX_INCLUDE_DIRS - The path to the flex headers # # The minimum required version of flex can be specified using the # standard syntax, e.g. find_package(FLEX 2.5.13) # # # If flex is found on the system, the module provides the macro: # FLEX_TARGET(Name FlexInput FlexOutput [COMPILE_FLAGS ]) # which creates a custom command to generate the file from # the file. If COMPILE_FLAGS option is specified, the next # parameter is added to the flex command line. Name is an alias used to # get details of this custom command. Indeed the macro defines the # following variables: # FLEX_${Name}_DEFINED - true is the macro ran successfully # FLEX_${Name}_OUTPUTS - the source file generated by the custom rule, an # alias for FlexOutput # FLEX_${Name}_INPUT - the flex source file, an alias for ${FlexInput} # # Flex scanners oftenly use tokens defined by Bison: the code generated # by Flex depends of the header generated by Bison. This module also # defines a macro: # ADD_FLEX_BISON_DEPENDENCY(FlexTarget BisonTarget) # which adds the required dependency between a scanner and a parser # where and are the first parameters of # respectively FLEX_TARGET and BISON_TARGET macros. # # ==================================================================== # Example: # # find_package(BISON) # find_package(FLEX) # # BISON_TARGET(MyParser parser.y ${CMAKE_CURRENT_BINARY_DIR}/parser.cpp) # FLEX_TARGET(MyScanner lexer.l ${CMAKE_CURRENT_BINARY_DIR}/lexer.cpp) # ADD_FLEX_BISON_DEPENDENCY(MyScanner MyParser) # # include_directories(${CMAKE_CURRENT_BINARY_DIR}) # add_executable(Foo # Foo.cc # ${BISON_MyParser_OUTPUTS} # ${FLEX_MyScanner_OUTPUTS} # ) # ==================================================================== #============================================================================= # Copyright 2009 Kitware, Inc. # Copyright 2006 Tristan Carel # # Distributed under the OSI-approved BSD License (the "License"); # see accompanying file Copyright.txt for details. # # 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. #============================================================================= # (To distribute this file outside of CMake, substitute the full # License text for the above reference.) find_program(FLEX_EXECUTABLE NAMES flex win_flex DOC "path to the flex executable") mark_as_advanced(FLEX_EXECUTABLE) find_library(FL_LIBRARY NAMES fl DOC "Path to the fl library") find_path(FLEX_INCLUDE_DIR FlexLexer.h DOC "Path to the flex headers") mark_as_advanced(FL_LIBRARY FLEX_INCLUDE_DIR) set(FLEX_INCLUDE_DIRS ${FLEX_INCLUDE_DIR}) set(FLEX_LIBRARIES ${FL_LIBRARY}) if(FLEX_EXECUTABLE) execute_process(COMMAND ${FLEX_EXECUTABLE} --version OUTPUT_VARIABLE FLEX_version_output ERROR_VARIABLE FLEX_version_error RESULT_VARIABLE FLEX_version_result OUTPUT_STRIP_TRAILING_WHITESPACE) if(NOT ${FLEX_version_result} EQUAL 0) if(FLEX_FIND_REQUIRED) message(SEND_ERROR "Command \"${FLEX_EXECUTABLE} --version\" failed with output:\n${FLEX_version_output}\n${FLEX_version_error}") else() message("Command \"${FLEX_EXECUTABLE} --version\" failed with output:\n${FLEX_version_output}\n${FLEX_version_error}\nFLEX_VERSION will not be available") endif() else() # older versions of flex printed "/full/path/to/executable version X.Y" # newer versions use "basename(executable) X.Y" get_filename_component(FLEX_EXE_NAME_WE "${FLEX_EXECUTABLE}" NAME_WE) get_filename_component(FLEX_EXE_EXT "${FLEX_EXECUTABLE}" EXT) string(REGEX REPLACE "^.*${FLEX_EXE_NAME_WE}(${FLEX_EXE_EXT})?\"? (version )?([0-9]+[^ ]*)( .*)?$" "\\3" FLEX_VERSION "${FLEX_version_output}") unset(FLEX_EXE_EXT) unset(FLEX_EXE_NAME_WE) endif() #============================================================ # FLEX_TARGET (public macro) #============================================================ # macro(FLEX_TARGET Name Input Output) set(FLEX_TARGET_usage "FLEX_TARGET( [COMPILE_FLAGS ]") if(${ARGC} GREATER 3) if(${ARGC} EQUAL 5) if("${ARGV3}" STREQUAL "COMPILE_FLAGS") set(FLEX_EXECUTABLE_opts "${ARGV4}") separate_arguments(FLEX_EXECUTABLE_opts) else() message(SEND_ERROR ${FLEX_TARGET_usage}) endif() else() message(SEND_ERROR ${FLEX_TARGET_usage}) endif() endif() add_custom_command(OUTPUT ${Output} COMMAND ${FLEX_EXECUTABLE} ARGS ${FLEX_EXECUTABLE_opts} -o${Output} ${Input} DEPENDS ${Input} COMMENT "[FLEX][${Name}] Building scanner with flex ${FLEX_VERSION}" WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}) set(FLEX_${Name}_DEFINED TRUE) set(FLEX_${Name}_OUTPUTS ${Output}) set(FLEX_${Name}_INPUT ${Input}) set(FLEX_${Name}_COMPILE_FLAGS ${FLEX_EXECUTABLE_opts}) endmacro() #============================================================ #============================================================ # ADD_FLEX_BISON_DEPENDENCY (public macro) #============================================================ # macro(ADD_FLEX_BISON_DEPENDENCY FlexTarget BisonTarget) if(NOT FLEX_${FlexTarget}_OUTPUTS) message(SEND_ERROR "Flex target `${FlexTarget}' does not exists.") endif() if(NOT BISON_${BisonTarget}_OUTPUT_HEADER) message(SEND_ERROR "Bison target `${BisonTarget}' does not exists.") endif() set_source_files_properties(${FLEX_${FlexTarget}_OUTPUTS} PROPERTIES OBJECT_DEPENDS ${BISON_${BisonTarget}_OUTPUT_HEADER}) endmacro() #============================================================ endif() include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake) FIND_PACKAGE_HANDLE_STANDARD_ARGS(FLEX REQUIRED_VARS FLEX_EXECUTABLE VERSION_VAR FLEX_VERSION) # FindFLEX.cmake ends here