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
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
|
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#.rst:
# CheckTypeSize
# -------------
#
# Check sizeof a type
#
# ::
#
# CHECK_TYPE_SIZE(TYPE VARIABLE [BUILTIN_TYPES_ONLY]
# [LANGUAGE <language>])
#
# Check if the type exists and determine its size. On return,
# "HAVE_${VARIABLE}" holds the existence of the type, and "${VARIABLE}"
# holds one of the following:
#
# ::
#
# <size> = type has non-zero size <size>
# "0" = type has arch-dependent size (see below)
# "" = type does not exist
#
# Both ``HAVE_${VARIABLE}`` and ``${VARIABLE}`` will be created as internal
# cache variables.
#
# Furthermore, the variable "${VARIABLE}_CODE" holds C preprocessor code
# to define the macro "${VARIABLE}" to the size of the type, or leave
# the macro undefined if the type does not exist.
#
# The variable "${VARIABLE}" may be "0" when CMAKE_OSX_ARCHITECTURES has
# multiple architectures for building OS X universal binaries. This
# indicates that the type size varies across architectures. In this
# case "${VARIABLE}_CODE" contains C preprocessor tests mapping from
# each architecture macro to the corresponding type size. The list of
# architecture macros is stored in "${VARIABLE}_KEYS", and the value for
# each key is stored in "${VARIABLE}-${KEY}".
#
# If the BUILTIN_TYPES_ONLY option is not given, the macro checks for
# headers <sys/types.h>, <stdint.h>, and <stddef.h>, and saves results
# in HAVE_SYS_TYPES_H, HAVE_STDINT_H, and HAVE_STDDEF_H. The type size
# check automatically includes the available headers, thus supporting
# checks of types defined in the headers.
#
# If LANGUAGE is set, the specified compiler will be used to perform the
# check. Acceptable values are C and CXX
#
# Despite the name of the macro you may use it to check the size of more
# complex expressions, too. To check e.g. for the size of a struct
# member you can do something like this:
#
# ::
#
# check_type_size("((struct something*)0)->member" SIZEOF_MEMBER)
#
#
#
# The following variables may be set before calling this macro to modify
# the way the check is run:
#
# ::
#
# CMAKE_REQUIRED_FLAGS = string of compile command line flags
# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
# CMAKE_REQUIRED_INCLUDES = list of include directories
# CMAKE_REQUIRED_LIBRARIES = list of libraries to link
# CMAKE_REQUIRED_QUIET = execute quietly without messages
# CMAKE_EXTRA_INCLUDE_FILES = list of extra headers to include
include(CheckIncludeFile)
include(CheckIncludeFileCXX)
get_filename_component(__check_type_size_dir "${CMAKE_CURRENT_LIST_FILE}" PATH)
include_guard(GLOBAL)
cmake_policy(PUSH)
cmake_policy(SET CMP0054 NEW)
#-----------------------------------------------------------------------------
# Helper function. DO NOT CALL DIRECTLY.
function(__check_type_size_impl type var map builtin language)
if(NOT CMAKE_REQUIRED_QUIET)
message(STATUS "Check size of ${type}")
endif()
# Include header files.
set(headers)
if(builtin)
if(HAVE_SYS_TYPES_H)
string(APPEND headers "#include <sys/types.h>\n")
endif()
if(HAVE_STDINT_H)
string(APPEND headers "#include <stdint.h>\n")
endif()
if(HAVE_STDDEF_H)
string(APPEND headers "#include <stddef.h>\n")
endif()
endif()
foreach(h ${CMAKE_EXTRA_INCLUDE_FILES})
string(APPEND headers "#include \"${h}\"\n")
endforeach()
# Perform the check.
if(language STREQUAL "C")
set(src ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.c)
elseif(language STREQUAL "CXX")
set(src ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.cpp)
else()
message(FATAL_ERROR "Unknown language:\n ${language}\nSupported languages: C, CXX.\n")
endif()
set(bin ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.bin)
configure_file(${__check_type_size_dir}/CheckTypeSize.c.in ${src} @ONLY)
try_compile(HAVE_${var} ${CMAKE_BINARY_DIR} ${src}
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES}
CMAKE_FLAGS
"-DCOMPILE_DEFINITIONS:STRING=${CMAKE_REQUIRED_FLAGS}"
"-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}"
OUTPUT_VARIABLE output
COPY_FILE ${bin}
)
if(HAVE_${var})
# The check compiled. Load information from the binary.
file(STRINGS ${bin} strings LIMIT_COUNT 10 REGEX "INFO:size")
# Parse the information strings.
set(regex_size ".*INFO:size\\[0*([^]]*)\\].*")
set(regex_key " key\\[([^]]*)\\]")
set(keys)
set(code)
set(mismatch)
set(first 1)
foreach(info ${strings})
if("${info}" MATCHES "${regex_size}")
# Get the type size.
set(size "${CMAKE_MATCH_1}")
if(first)
set(${var} ${size})
elseif(NOT "${size}" STREQUAL "${${var}}")
set(mismatch 1)
endif()
set(first 0)
# Get the architecture map key.
string(REGEX MATCH "${regex_key}" key "${info}")
string(REGEX REPLACE "${regex_key}" "\\1" key "${key}")
if(key)
string(APPEND code "\nset(${var}-${key} \"${size}\")")
list(APPEND keys ${key})
endif()
endif()
endforeach()
# Update the architecture-to-size map.
if(mismatch AND keys)
configure_file(${__check_type_size_dir}/CheckTypeSizeMap.cmake.in ${map} @ONLY)
set(${var} 0)
else()
file(REMOVE ${map})
endif()
if(mismatch AND NOT keys)
message(SEND_ERROR "CHECK_TYPE_SIZE found different results, consider setting CMAKE_OSX_ARCHITECTURES or CMAKE_TRY_COMPILE_OSX_ARCHITECTURES to one or no architecture !")
endif()
if(NOT CMAKE_REQUIRED_QUIET)
message(STATUS "Check size of ${type} - done")
endif()
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"Determining size of ${type} passed with the following output:\n${output}\n\n")
set(${var} "${${var}}" CACHE INTERNAL "CHECK_TYPE_SIZE: sizeof(${type})")
else()
# The check failed to compile.
if(NOT CMAKE_REQUIRED_QUIET)
message(STATUS "Check size of ${type} - failed")
endif()
file(READ ${src} content)
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Determining size of ${type} failed with the following output:\n${output}\n${src}:\n${content}\n\n")
set(${var} "" CACHE INTERNAL "CHECK_TYPE_SIZE: ${type} unknown")
file(REMOVE ${map})
endif()
endfunction()
#-----------------------------------------------------------------------------
macro(CHECK_TYPE_SIZE TYPE VARIABLE)
# parse arguments
unset(doing)
foreach(arg ${ARGN})
if("x${arg}" STREQUAL "xBUILTIN_TYPES_ONLY")
set(_CHECK_TYPE_SIZE_${arg} 1)
unset(doing)
elseif("x${arg}" STREQUAL "xLANGUAGE") # change to MATCHES for more keys
set(doing "${arg}")
set(_CHECK_TYPE_SIZE_${doing} "")
elseif("x${doing}" STREQUAL "xLANGUAGE")
set(_CHECK_TYPE_SIZE_${doing} "${arg}")
unset(doing)
else()
message(FATAL_ERROR "Unknown argument:\n ${arg}\n")
endif()
endforeach()
if("x${doing}" MATCHES "^x(LANGUAGE)$")
message(FATAL_ERROR "Missing argument:\n ${doing} arguments requires a value\n")
endif()
if(DEFINED _CHECK_TYPE_SIZE_LANGUAGE)
if(NOT "x${_CHECK_TYPE_SIZE_LANGUAGE}" MATCHES "^x(C|CXX)$")
message(FATAL_ERROR "Unknown language:\n ${_CHECK_TYPE_SIZE_LANGUAGE}.\nSupported languages: C, CXX.\n")
endif()
set(_language ${_CHECK_TYPE_SIZE_LANGUAGE})
else()
set(_language C)
endif()
# Optionally check for standard headers.
if(_CHECK_TYPE_SIZE_BUILTIN_TYPES_ONLY)
set(_builtin 0)
else()
set(_builtin 1)
if(_language STREQUAL "C")
check_include_file(sys/types.h HAVE_SYS_TYPES_H)
check_include_file(stdint.h HAVE_STDINT_H)
check_include_file(stddef.h HAVE_STDDEF_H)
elseif(_language STREQUAL "CXX")
check_include_file_cxx(sys/types.h HAVE_SYS_TYPES_H)
check_include_file_cxx(stdint.h HAVE_STDINT_H)
check_include_file_cxx(stddef.h HAVE_STDDEF_H)
endif()
endif()
unset(_CHECK_TYPE_SIZE_BUILTIN_TYPES_ONLY)
unset(_CHECK_TYPE_SIZE_LANGUAGE)
# Compute or load the size or size map.
set(${VARIABLE}_KEYS)
set(_map_file ${CMAKE_BINARY_DIR}/${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${VARIABLE}.cmake)
if(NOT DEFINED HAVE_${VARIABLE})
__check_type_size_impl(${TYPE} ${VARIABLE} ${_map_file} ${_builtin} ${_language})
endif()
include(${_map_file} OPTIONAL)
set(_map_file)
set(_builtin)
# Create preprocessor code.
if(${VARIABLE}_KEYS)
set(${VARIABLE}_CODE)
set(_if if)
foreach(key ${${VARIABLE}_KEYS})
string(APPEND ${VARIABLE}_CODE "#${_if} defined(${key})\n# define ${VARIABLE} ${${VARIABLE}-${key}}\n")
set(_if elif)
endforeach()
string(APPEND ${VARIABLE}_CODE "#else\n# error ${VARIABLE} unknown\n#endif")
set(_if)
elseif(${VARIABLE})
set(${VARIABLE}_CODE "#define ${VARIABLE} ${${VARIABLE}}")
else()
set(${VARIABLE}_CODE "/* #undef ${VARIABLE} */")
endif()
endmacro()
#-----------------------------------------------------------------------------
cmake_policy(POP)
|
