164 lines
6.6 KiB
CMake
164 lines
6.6 KiB
CMake
# - Find lex executable and provides a macro to generate custom build rules
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#
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# The module defines the following variables:
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# LEX_FOUND - true is lex executable is found
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# LEX_EXECUTABLE - the path to the lex executable
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# LEX_LIBRARIES - The lex libraries
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#
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# If lex is found on the system, the module provides the macro:
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# LEX_TARGET(Name FlexInput FlexOutput [COMPILE_FLAGS <string>])
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# which creates a custom command to generate the <FlexOutput> file from
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# the <FlexInput> file. If COMPILE_FLAGS option is specified, the next
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# parameter is added to the lex command line. Name is an alias used to
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# get details of this custom command. Indeed the macro defines the
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# following variables:
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# LEX_${Name}_DEFINED - true is the macro ran successfully
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# LEX_${Name}_OUTPUTS - the source file generated by the custom rule, an
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# alias for FlexOutput
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# LEX_${Name}_INPUT - the lex source file, an alias for ${FlexInput}
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#
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# Flex scanners oftenly use tokens defined by Yacc: the code generated
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# by Flex depends of the header generated by Yacc. This module also
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# defines a macro:
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# ADD_LEX_YACC_DEPENDENCY(FlexTarget YaccTarget)
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# which adds the required dependency between a scanner and a parser
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# where <FlexTarget> and <YaccTarget> are the first parameters of
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# respectively LEX_TARGET and YACC_TARGET macros.
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#
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# ====================================================================
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# Example:
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#
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# find_package(YACC)
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# find_package(LEX)
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#
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# YACC_TARGET(MyParser parser.y ${CMAKE_CURRENT_BINARY_DIR}/parser.cpp
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# LEX_TARGET(MyScanner lexer.l ${CMAKE_CURRENT_BIANRY_DIR}/lexer.cpp)
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# ADD_LEX_YACC_DEPENDENCY(MyScanner MyParser)
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#
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# include_directories(${CMAKE_CURRENT_BINARY_DIR})
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# add_executable(Foo
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# Foo.cc
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# ${YACC_MyParser_OUTPUTS}
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# ${LEX_MyScanner_OUTPUTS}
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# )
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# ====================================================================
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#
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#=============================================================================
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# Copyright 2010 United States Government as represented by
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# the U.S. Army Research Laboratory.
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# Copyright 2009 Kitware, Inc.
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# Copyright 2006 Tristan Carel
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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#
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# * The names of the authors may not be used to endorse or promote
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# products derived from this software without specific prior written
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# permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#=============================================================================
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FIND_PROGRAM(LEX_EXECUTABLE flex DOC "path to the lex executable")
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IF(NOT LEX_EXECUTABLE)
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FIND_PROGRAM(LEX_EXECUTABLE lex DOC "path to the lex executable")
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ENDIF(NOT LEX_EXECUTABLE)
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MARK_AS_ADVANCED(LEX_EXECUTABLE)
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FIND_LIBRARY(FL_LIBRARY NAMES fl
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DOC "path to the fl library")
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MARK_AS_ADVANCED(FL_LIBRARY)
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SET(LEX_LIBRARIES ${FL_LIBRARY})
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IF(LEX_EXECUTABLE)
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#============================================================
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# LEX_TARGET (public macro)
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#============================================================
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#
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MACRO(LEX_TARGET Name Input Output)
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SET(LEX_TARGET_usage "LEX_TARGET(<Name> <Input> <Output> [COMPILE_FLAGS <string>]")
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IF(${ARGC} GREATER 3)
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IF(${ARGC} EQUAL 5)
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IF("${ARGV3}" STREQUAL "COMPILE_FLAGS")
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SET(LEX_EXECUTABLE_opts "${ARGV4}")
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SEPARATE_ARGUMENTS(LEX_EXECUTABLE_opts)
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ELSE()
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MESSAGE(SEND_ERROR ${LEX_TARGET_usage})
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ENDIF()
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ELSE()
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MESSAGE(SEND_ERROR ${LEX_TARGET_usage})
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ENDIF()
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ENDIF()
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ADD_CUSTOM_COMMAND(OUTPUT ${Output}
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COMMAND ${LEX_EXECUTABLE}
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ARGS ${LEX_EXECUTABLE_opts} -o${Output} ${Input}
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DEPENDS ${Input}
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COMMENT "[LEX][${Name}] Building scanner with ${LEX_EXECUTABLE}"
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WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
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SET(LEX_${Name}_DEFINED TRUE)
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SET(LEX_${Name}_OUTPUTS ${Output})
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SET(LEX_${Name}_INPUT ${Input})
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SET(LEX_${Name}_COMPILE_FLAGS ${LEX_EXECUTABLE_opts})
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ENDMACRO(LEX_TARGET)
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#============================================================
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#============================================================
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# ADD_LEX_YACC_DEPENDENCY (public macro)
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#============================================================
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#
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MACRO(ADD_LEX_YACC_DEPENDENCY FlexTarget YaccTarget)
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IF(NOT LEX_${FlexTarget}_OUTPUTS)
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MESSAGE(SEND_ERROR "Flex target `${FlexTarget}' does not exists.")
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ENDIF()
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IF(NOT YACC_${YaccTarget}_OUTPUT_HEADER)
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MESSAGE(SEND_ERROR "Yacc target `${YaccTarget}' does not exists.")
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ENDIF()
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SET_SOURCE_FILES_PROPERTIES(${LEX_${FlexTarget}_OUTPUTS}
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PROPERTIES OBJECT_DEPENDS ${YACC_${YaccTarget}_OUTPUT_HEADER})
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ENDMACRO(ADD_LEX_YACC_DEPENDENCY)
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#============================================================
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#Need to run a test lex file to determine if YYTEXT_POINTER needs
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#to be defined
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EXEC_PROGRAM(${LEX_EXECUTABLE} ARGS ${CMAKE_SOURCE_DIR}/misc/CMake/test_srcs/lex_test.l -o ${CMAKE_BINARY_DIR}/CMakeTmp/lex_test.c RETURN_VALUE _retval OUTPUT_VARIABLE _lexOut)
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INCLUDE (CheckCFileRuns)
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SET(FILE_RUN_DEFINITIONS "-DYYTEXT_POINTER=1")
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CHECK_C_FILE_RUNS(${CMAKE_CURRENT_SOURCE_DIR}/cmake/test_srcs/sys_wait_test.c YYTEXT_POINTER)
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SET(FILE_RUN_DEFINITIONS)
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IF(CONFIG_H_FILE)
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FILE(APPEND ${CONFIG_H_FILE} "#cmakedefine YYTEXT_POINTER 1\n")
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ENDIF(CONFIG_H_FILE)
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ENDIF(LEX_EXECUTABLE)
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INCLUDE(FindPackageHandleStandardArgs)
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(LEX DEFAULT_MSG LEX_EXECUTABLE)
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# FindLEX.cmake ends here
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