blob: d22b7ec67a5bf6402de7a4483f6ab2708de60379 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
# 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 "${FLEX_version_output}")
unset(FLEX_EXE_EXT)
unset(FLEX_EXE_NAME_WE)
endif()
#============================================================
# FLEX_TARGET (public macro)
#============================================================
#
macro(FLEX_TARGET Name Input Output)
set(FLEX_TARGET_outputs "${Output}")
set(FLEX_EXECUTABLE_opts "")
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 ${FLEX_TARGET_usage})
else()
if(NOT "${FLEX_TARGET_ARG_COMPILE_FLAGS}" STREQUAL "")
set(FLEX_EXECUTABLE_opts "${FLEX_TARGET_ARG_COMPILE_FLAGS}")
separate_arguments(FLEX_EXECUTABLE_opts)
endif()
if(NOT "${FLEX_TARGET_ARG_DEFINES_FILE}" STREQUAL "")
list(APPEND FLEX_TARGET_outputs "${FLEX_TARGET_ARG_DEFINES_FILE}")
list(APPEND FLEX_EXECUTABLE_opts --header-file=${FLEX_TARGET_ARG_DEFINES_FILE})
endif()
add_custom_command(OUTPUT ${FLEX_TARGET_outputs}
COMMAND ${FLEX_EXECUTABLE} ${FLEX_EXECUTABLE_opts} -o${Output} ${Input}
VERBATIM
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 ${FLEX_EXECUTABLE_opts})
if("${FLEX_TARGET_ARG_DEFINES_FILE}" STREQUAL "")
set(FLEX_${Name}_OUTPUT_HEADER "")
else()
set(FLEX_${Name}_OUTPUT_HEADER ${FLEX_TARGET_ARG_DEFINES_FILE})
endif()
endif()
endmacro()
#============================================================
#============================================================
# ADD_FLEX_BISON_DEPENDENCY (public macro)
#============================================================
#
macro(ADD_FLEX_BISON_DEPENDENCY FlexTarget BisonTarget)
if(NOT FLEX_${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)
|
