mirror of
https://github.com/reactos/CMake.git
synced 2024-11-23 11:39:48 +00:00
257 lines
8.3 KiB
CMake
257 lines
8.3 KiB
CMake
# 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. If ``COMPILE_FLAGS`` option is specified, the next
|
|
parameter is added to the flex command line. If flex is configured to
|
|
output a header file, the ``DEFINES_FILE`` option may be used to specify its
|
|
name. 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 ${FlexInput}
|
|
FLEX_${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 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)
|