142 lines
5.4 KiB
CMake
142 lines
5.4 KiB
CMake
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# - Find flex executable and provides a macro to generate custom build rules
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#
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# The module defines the following variables:
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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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#
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# If flex is found on the system, the module provides the macro:
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# FLEX_TARGET(Name FlexInput FlexOutput [COMPILE_FLAGS <string>])
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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. Name is an alias used to
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# get details of this custom command. Indeed the macro defines the
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# following variables:
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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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#
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# Flex scanners oftenly 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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# 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 ${CMAKE_CURRENT_BIANRY_DIR}/lexer.cpp)
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# ADD_FLEX_BISON_DEPENDENCY(MyScanner MyParser)
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#
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# include_directories(${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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# ====================================================================
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#=============================================================================
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# Copyright 2009 Kitware, Inc.
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# Copyright 2006 Tristan Carel
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distributed this file outside of CMake, substitute the full
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# License text for the above reference.)
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FIND_PROGRAM(FLEX_EXECUTABLE 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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MARK_AS_ADVANCED(FL_LIBRARY)
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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 ${FLEX_version_result} EQUAL 0)
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MESSAGE(SEND_ERROR "Command \"${FLEX_EXECUTABLE} --version\" failed with output:\n${FLEX_version_error}")
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ELSE()
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STRING(REGEX REPLACE "^flex (.*)$" "\\1"
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FLEX_VERSION "${FLEX_version_output}")
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ENDIF()
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#============================================================
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# FLEX_TARGET (public macro)
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#============================================================
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#
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MACRO(FLEX_TARGET Name Input Output)
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SET(FLEX_TARGET_usage "FLEX_TARGET(<Name> <Input> <Output> [COMPILE_FLAGS <string>]")
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IF(${ARGC} GREATER 3)
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IF(${ARGC} EQUAL 5)
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IF("${ARGV3}" STREQUAL "COMPILE_FLAGS")
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SET(FLEX_EXECUTABLE_opts "${ARGV4}")
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SEPARATE_ARGUMENTS(FLEX_EXECUTABLE_opts)
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ELSE()
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MESSAGE(SEND_ERROR ${FLEX_TARGET_usage})
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ENDIF()
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ELSE()
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MESSAGE(SEND_ERROR ${FLEX_TARGET_usage})
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ENDIF()
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ENDIF()
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ADD_CUSTOM_COMMAND(OUTPUT ${Output}
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COMMAND ${FLEX_EXECUTABLE}
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ARGS ${FLEX_EXECUTABLE_opts} -o${Output} ${Input}
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DEPENDS ${Input}
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COMMENT "[FLEX][${Name}] Building scanner with flex ${FLEX_VERSION}"
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WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
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SET(FLEX_${Name}_DEFINED TRUE)
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SET(FLEX_${Name}_OUTPUTS ${Output})
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SET(FLEX_${Name}_INPUT ${Input})
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SET(FLEX_${Name}_COMPILE_FLAGS ${FLEX_EXECUTABLE_opts})
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ENDMACRO(FLEX_TARGET)
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#============================================================
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#============================================================
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# ADD_FLEX_BISON_DEPENDENCY (public macro)
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#============================================================
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#
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MACRO(ADD_FLEX_BISON_DEPENDENCY FlexTarget BisonTarget)
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IF(NOT FLEX_${FlexTarget}_OUTPUTS)
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MESSAGE(SEND_ERROR "Flex target `${FlexTarget}' does not exists.")
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ENDIF()
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IF(NOT BISON_${BisonTarget}_OUTPUT_HEADER)
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MESSAGE(SEND_ERROR "Bison target `${BisonTarget}' does not exists.")
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ENDIF()
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SET_SOURCE_FILES_PROPERTIES(${FLEX_${FlexTarget}_OUTPUTS}
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PROPERTIES OBJECT_DEPENDS ${BISON_${BisonTarget}_OUTPUT_HEADER})
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ENDMACRO(ADD_FLEX_BISON_DEPENDENCY)
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#============================================================
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ENDIF(FLEX_EXECUTABLE)
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INCLUDE(FindPackageHandleStandardArgs)
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(FLEX DEFAULT_MSG FLEX_EXECUTABLE)
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# FindFLEX.cmake ends here
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