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Diffstat (limited to 'Modules/FindFLEX.cmake')
| -rw-r--r-- | Modules/FindFLEX.cmake | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/Modules/FindFLEX.cmake b/Modules/FindFLEX.cmake new file mode 100644 index 000000000..586f77a6e --- /dev/null +++ b/Modules/FindFLEX.cmake @@ -0,0 +1,161 @@ +# - 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 <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 ${CMAKE_CURRENT_BINARY_DIR}/lexer.cpp) +# ADD_FLEX_BISON_DEPENDENCY(MyScanner MyParser) +# +# include_directories(${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 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${FLEX_version_error}\nFLEX_VERSION will not be available") + ENDIF() + ELSE() + # older versions of flex printed "/full/path/to/executable version X.Y" + # newer versions use "basename(executable) X.Y" + GET_FILENAME_COMPONENT(FLEX_EXE_NAME "${FLEX_EXECUTABLE}" NAME) + STRING(REGEX REPLACE "^.*${FLEX_EXE_NAME}\"? (version )?([0-9]+[^ ]*)$" "\\2" + FLEX_VERSION "${FLEX_version_output}") + UNSET(FLEX_EXE_NAME) + ENDIF() + + #============================================================ + # FLEX_TARGET (public macro) + #============================================================ + # + MACRO(FLEX_TARGET Name Input Output) + SET(FLEX_TARGET_usage "FLEX_TARGET(<Name> <Input> <Output> [COMPILE_FLAGS <string>]") + IF(${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(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake) +FIND_PACKAGE_HANDLE_STANDARD_ARGS(FLEX REQUIRED_VARS FLEX_EXECUTABLE + VERSION_VAR FLEX_VERSION) + +# FindFLEX.cmake ends here |