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#
# Copyright (c) 2007-2009 High Performance Computing Center Stuttgart,
# University of Stuttgart. All rights reserved.
# $COPYRIGHT$
#
# Additional copyrights may follow
#
# $HEADER$
#
#
# FLEX_FOUND - system has Flex
# FLEX_EXECUTABLE - path of the flex executable
# FLEX_VERSION - the version string, like "2.5.31"
#
MACRO(FIND_FLEX)
IF(NOT FLEX_FOUND)
MESSAGE(STATUS "Check for working flex...")
# first find out if it's already installed somewhere
FIND_PROGRAM(FLEX_EXECUTABLE_SYS NAMES flex)
IF (WIN32)
IF(FLEX_EXECUTABLE_SYS)
SET(FLEX_EXECUTABLE ${FLEX_EXECUTABLE_SYS} CACHE FILEPATH "Flex")
ELSE(FLEX_EXECUTABLE_SYS)
IF(EXISTS ${CMAKE_SOURCE_DIR}/contrib/platform/win32/bin/flex.exe)
# in case that no flex is installed, use our own version
SET(FLEX_EXECUTABLE "${CMAKE_SOURCE_DIR}/contrib/platform/win32/bin/flex.exe" CACHE FILEPATH "Flex")
ENDIF(EXISTS ${CMAKE_SOURCE_DIR}/contrib/platform/win32/bin/flex.exe)
ENDIF(FLEX_EXECUTABLE_SYS)
ELSE(WIN32)
# nothing to do here at moment.
ENDIF(WIN32)
IF(FLEX_EXECUTABLE)
SET(FLEX_FOUND TRUE CACHE INTERNAL "found flex")
EXECUTE_PROCESS(COMMAND ${FLEX_EXECUTABLE} --version
OUTPUT_VARIABLE _FLEX_VERSION
)
STRING (REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" FLEX_VERSION "${_FLEX_VERSION}")
ENDIF(FLEX_EXECUTABLE)
IF(FLEX_FOUND)
IF(NOT Flex_FIND_QUIETLY)
MESSAGE(STATUS "Check for working flex...done")
ENDIF(NOT Flex_FIND_QUIETLY)
ELSE(FLEX_FOUND)
IF(Flex_FIND_REQUIRED)
MESSAGE(STATUS "Check for working flex...failed")
ENDIF(Flex_FIND_REQUIRED)
ENDIF(FLEX_FOUND)
ENDIF(NOT FLEX_FOUND)
ENDMACRO(FIND_FLEX)
#
# Generate the corresponding C file from the lex file,
# and add it in to the source list for the target.
#
MACRO(ADD_FLEX_FILE _sourcelist _source _prefix _output_dir)
GET_FILENAME_COMPONENT(_in ${_source} ABSOLUTE)
GET_FILENAME_COMPONENT(_basename ${_source} NAME_WE)
STRING(LENGTH "${_prefix}" _prefix_length)
IF(NOT _prefix_length EQUAL 0)
SET(_out ${_output_dir}/${_basename}.c)
SET(_args -P${_prefix})
ELSE(NOT _prefix_length EQUAL 0)
SET(_out ${_output_dir}/${_basename}.c)
ENDIF(NOT _prefix_length EQUAL 0)
#MESSAGE("${FLEX_EXECUTABLE} -o${_out} ${_args} ${_in}")
IF(NOT DEFINED ${_basename}_DONE)
MESSAGE(STATUS "parse ${_basename} with flex...")
FILE(MAKE_DIRECTORY ${_output_dir})
EXECUTE_PROCESS(
COMMAND ${FLEX_EXECUTABLE} -o${_out} ${_args} ${_in}
OUTPUT_VARIABLE OUTPUT
RESULT_VARIABLE RESULT
ERROR_VARIABLE ERROR
)
IF (NOT ${RESULT} STREQUAL "1")
MESSAGE(STATUS "${ERROR}parse ${_basename} with flex...done")
ELSE (NOT ${RESULT} STREQUAL "1")
MESSAGE(FATAL_ERROR "${ERROR}parse ${_basename} with flex...failed")
ENDIF (NOT ${RESULT} STREQUAL "1")
SET(${_basename}_DONE TRUE CACHE INTERNAL "${_basename} flex parse done")
ENDIF(NOT DEFINED ${_basename}_DONE)
SET(${_sourcelist} ${${_sourcelist}} ${_out} )
SET_SOURCE_FILES_PROPERTIES(${_out} PROPERTIES COMPILE_DEFINITIONS YY_NO_UNISTD_H)
ENDMACRO(ADD_FLEX_FILE)
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