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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#[=======================================================================[.rst:
FindFLEX
--------
Find Fast Lexical Analyzer (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. :command:`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>]
[DEFINES_FILE <string>]
)
which creates a custom command to generate the ``FlexOutput`` file from
the ``FlexInput`` file. Name is an alias used to get details of this custom
command. If ``COMPILE_FLAGS`` option is specified, the next
parameter is added to the flex command line.
.. versionadded:: 3.5
If flex is configured to
output a header file, the ``DEFINES_FILE`` option may be used to specify its
name.
.. versionchanged:: 3.17
When :policy:`CMP0098` is set to ``NEW``, ``flex`` runs in the
:variable:`CMAKE_CURRENT_BINARY_DIR` directory.
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 ${FlexInput}
FLEX_${Name}_OUTPUT_HEADER - the header flex output, if any.
Flex scanners often 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}
)
target_link_libraries(Foo ${FLEX_LIBRARIES})
====================================================================
#]=======================================================================]
find_program(FLEX_EXECUTABLE NAMES flex win-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 "${FLEX_version_output}")
unset(FLEX_EXE_EXT)
unset(FLEX_EXE_NAME_WE)
endif()
#============================================================
# FLEX_TARGET (public macro)
#============================================================
#
macro(FLEX_TARGET Name Input Output)
set(FLEX_TARGET_PARAM_OPTIONS)
set(FLEX_TARGET_PARAM_ONE_VALUE_KEYWORDS
COMPILE_FLAGS
DEFINES_FILE
)
set(FLEX_TARGET_PARAM_MULTI_VALUE_KEYWORDS)
cmake_parse_arguments(
FLEX_TARGET_ARG
"${FLEX_TARGET_PARAM_OPTIONS}"
"${FLEX_TARGET_PARAM_ONE_VALUE_KEYWORDS}"
"${FLEX_TARGET_MULTI_VALUE_KEYWORDS}"
${ARGN}
)
set(FLEX_TARGET_usage "FLEX_TARGET(<Name> <Input> <Output> [COMPILE_FLAGS <string>] [DEFINES_FILE <string>]")
if(NOT "${FLEX_TARGET_ARG_UNPARSED_ARGUMENTS}" STREQUAL "")
message(SEND_ERROR ${FLEX_TARGET_usage})
else()
cmake_policy(GET CMP0098 _flex_CMP0098
PARENT_SCOPE # undocumented, do not use outside of CMake
)
set(_flex_INPUT "${Input}")
if("x${_flex_CMP0098}x" STREQUAL "xNEWx")
set(_flex_WORKING_DIR "${CMAKE_CURRENT_BINARY_DIR}")
if(NOT IS_ABSOLUTE "${_flex_INPUT}")
set(_flex_INPUT "${CMAKE_CURRENT_SOURCE_DIR}/${_flex_INPUT}")
endif()
else()
set(_flex_WORKING_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
endif()
unset(_flex_CMP0098)
set(_flex_OUTPUT "${Output}")
if(NOT IS_ABSOLUTE ${_flex_OUTPUT})
set(_flex_OUTPUT "${_flex_WORKING_DIR}/${_flex_OUTPUT}")
endif()
set(_flex_TARGET_OUTPUTS "${_flex_OUTPUT}")
set(_flex_EXE_OPTS "")
if(NOT "${FLEX_TARGET_ARG_COMPILE_FLAGS}" STREQUAL "")
set(_flex_EXE_OPTS "${FLEX_TARGET_ARG_COMPILE_FLAGS}")
separate_arguments(_flex_EXE_OPTS)
endif()
set(_flex_OUTPUT_HEADER "")
if(NOT "${FLEX_TARGET_ARG_DEFINES_FILE}" STREQUAL "")
set(_flex_OUTPUT_HEADER "${FLEX_TARGET_ARG_DEFINES_FILE}")
if(IS_ABSOLUTE "${_flex_OUTPUT_HEADER}")
set(_flex_OUTPUT_HEADER_ABS "${_flex_OUTPUT_HEADER}")
else()
set(_flex_OUTPUT_HEADER_ABS "${_flex_WORKING_DIR}/${_flex_OUTPUT_HEADER}")
endif()
list(APPEND _flex_TARGET_OUTPUTS "${_flex_OUTPUT_HEADER_ABS}")
list(APPEND _flex_EXE_OPTS --header-file=${_flex_OUTPUT_HEADER_ABS})
endif()
get_filename_component(_flex_EXE_NAME_WE "${FLEX_EXECUTABLE}" NAME_WE)
add_custom_command(OUTPUT ${_flex_TARGET_OUTPUTS}
COMMAND ${FLEX_EXECUTABLE} ${_flex_EXE_OPTS} -o${_flex_OUTPUT} ${_flex_INPUT}
VERBATIM
DEPENDS ${_flex_INPUT}
COMMENT "[FLEX][${Name}] Building scanner with ${_flex_EXE_NAME_WE} ${FLEX_VERSION}"
WORKING_DIRECTORY ${_flex_WORKING_DIR})
set(FLEX_${Name}_DEFINED TRUE)
set(FLEX_${Name}_OUTPUTS ${_flex_TARGET_OUTPUTS})
set(FLEX_${Name}_INPUT ${_flex_INPUT})
set(FLEX_${Name}_COMPILE_FLAGS ${_flex_EXE_OPTS})
set(FLEX_${Name}_OUTPUT_HEADER ${_flex_OUTPUT_HEADER})
unset(_flex_EXE_NAME_WE)
unset(_flex_EXE_OPTS)
unset(_flex_INPUT)
unset(_flex_OUTPUT)
unset(_flex_OUTPUT_HEADER)
unset(_flex_OUTPUT_HEADER_ABS)
unset(_flex_TARGET_OUTPUTS)
unset(_flex_WORKING_DIR)
endif()
endmacro()
#============================================================
#============================================================
# ADD_FLEX_BISON_DEPENDENCY (public macro)
#============================================================
#
macro(ADD_FLEX_BISON_DEPENDENCY FlexTarget BisonTarget)
if(NOT FLEX_${FlexTarget}_OUTPUTS)
message(SEND_ERROR "Flex target `${FlexTarget}' does not exist.")
endif()
if(NOT BISON_${BisonTarget}_OUTPUT_HEADER)
message(SEND_ERROR "Bison target `${BisonTarget}' does not exist.")
endif()
set_source_files_properties(${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)
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