| # - 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 |
| # |
| # If flex is found on the system, the module provides the macro: |
| # FLEX_TARGET(Name FlexInput FlexOutput [COMPILE_FLAGS <string>]) |
| # which creates a custom command to generate the <FlexOutput> file from |
| # the <FlexInput> 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 <FlexTarget> and <BisonTarget> 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 ${CMAKE_CURRENT_BIANRY_DIR}/lexer.cpp) |
| # ADD_FLEX_BISON_DEPENDENCY(MyScanner MyParser) |
| # |
| # include_directories(${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 distributed this file outside of CMake, substitute the full |
| # License text for the above reference.) |
| |
| FIND_PROGRAM(FLEX_EXECUTABLE flex DOC "path to the flex executable") |
| MARK_AS_ADVANCED(FLEX_EXECUTABLE) |
| |
| FIND_LIBRARY(FL_LIBRARY NAMES fl |
| DOC "path to the fl library") |
| MARK_AS_ADVANCED(FL_LIBRARY) |
| 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 ${FLEX_version_result} EQUAL 0) |
| MESSAGE(SEND_ERROR "Command \"${FLEX_EXECUTABLE} --version\" failed with output:\n${FLEX_version_error}") |
| ELSE() |
| STRING(REGEX REPLACE "^flex (.*)$" "\\1" |
| FLEX_VERSION "${FLEX_version_output}") |
| ENDIF() |
| |
| #============================================================ |
| # FLEX_TARGET (public macro) |
| #============================================================ |
| # |
| MACRO(FLEX_TARGET Name Input Output) |
| SET(FLEX_TARGET_usage "FLEX_TARGET(<Name> <Input> <Output> [COMPILE_FLAGS <string>]") |
| IF(${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 ${FLEX_EXECUTABLE_opts}) |
| ENDMACRO(FLEX_TARGET) |
| #============================================================ |
| |
| |
| #============================================================ |
| # ADD_FLEX_BISON_DEPENDENCY (public macro) |
| #============================================================ |
| # |
| MACRO(ADD_FLEX_BISON_DEPENDENCY FlexTarget BisonTarget) |
| |
| IF(NOT FLEX_${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(ADD_FLEX_BISON_DEPENDENCY) |
| #============================================================ |
| |
| ENDIF(FLEX_EXECUTABLE) |
| |
| INCLUDE(FindPackageHandleStandardArgs) |
| FIND_PACKAGE_HANDLE_STANDARD_ARGS(FLEX DEFAULT_MSG FLEX_EXECUTABLE) |
| |
| # FindFLEX.cmake ends here |