blob: d8297d91cfe8ea62bc0e8e4c26030d7ec5960614 (
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
222
223
224
225
226
227
228
229
230
231
232
|
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#[=======================================================================[.rst:
CheckIPOSupported
-----------------
Check whether the compiler supports an interprocedural optimization (IPO/LTO).
Use this before enabling the :prop_tgt:`INTERPROCEDURAL_OPTIMIZATION` target
property.
.. command:: check_ipo_supported
::
check_ipo_supported([RESULT <result>] [OUTPUT <output>]
[LANGUAGES <lang>...])
Options are:
``RESULT <result>``
Set ``<result>`` variable to ``YES`` if IPO is supported by the
compiler and ``NO`` otherwise. If this option is not given then
the command will issue a fatal error if IPO is not supported.
``OUTPUT <output>``
Set ``<output>`` variable with details about any error.
``LANGUAGES <lang>...``
Specify languages whose compilers to check.
Languages ``C``, ``CXX``, and ``Fortran`` are supported.
It makes no sense to use this module when :policy:`CMP0069` is set to ``OLD`` so
module will return error in this case. See policy :policy:`CMP0069` for details.
Examples
^^^^^^^^
.. code-block:: cmake
check_ipo_supported() # fatal error if IPO is not supported
set_property(TARGET foo PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
.. code-block:: cmake
# Optional IPO. Do not use IPO if it's not supported by compiler.
check_ipo_supported(RESULT result OUTPUT output)
if(result)
set_property(TARGET foo PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
else()
message(WARNING "IPO is not supported: ${output}")
endif()
#]=======================================================================]
include(CMakeParseArguments) # cmake_parse_arguments
# X_RESULT - name of the final result variable
# X_OUTPUT - name of the variable with information about error
macro(_ipo_not_supported output)
string(COMPARE EQUAL "${X_RESULT}" "" is_empty)
if(is_empty)
message(FATAL_ERROR "IPO is not supported (${output}).")
endif()
set("${X_RESULT}" NO PARENT_SCOPE)
set("${X_OUTPUT}" "${output}" PARENT_SCOPE)
endmacro()
# Run IPO/LTO test
macro(_ipo_run_language_check language)
set(testdir "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/_CMakeLTOTest-${language}")
file(REMOVE_RECURSE "${testdir}")
file(MAKE_DIRECTORY "${testdir}")
set(bindir "${testdir}/bin")
set(srcdir "${testdir}/src")
file(MAKE_DIRECTORY "${bindir}")
file(MAKE_DIRECTORY "${srcdir}")
set(TRY_COMPILE_PROJECT_NAME "lto-test")
set(try_compile_src "${CMAKE_ROOT}/Modules/CheckIPOSupported")
# Use:
# * TRY_COMPILE_PROJECT_NAME
# * CMAKE_VERSION
configure_file(
"${try_compile_src}/CMakeLists-${language}.txt.in"
"${srcdir}/CMakeLists.txt"
@ONLY
)
string(COMPARE EQUAL "${language}" "C" is_c)
string(COMPARE EQUAL "${language}" "CXX" is_cxx)
string(COMPARE EQUAL "${language}" "Fortran" is_fortran)
if(is_c)
set(copy_sources foo.c main.c)
elseif(is_cxx)
set(copy_sources foo.cpp main.cpp)
elseif(is_fortran)
set(copy_sources foo.f main.f)
else()
message(FATAL_ERROR "Language not supported")
endif()
foreach(x ${copy_sources})
configure_file(
"${try_compile_src}/${x}"
"${srcdir}/${x}"
COPYONLY
)
endforeach()
try_compile(
result
"${bindir}"
"${srcdir}"
"${TRY_COMPILE_PROJECT_NAME}"
CMAKE_FLAGS
"-DCMAKE_VERBOSE_MAKEFILE=ON"
"-DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON"
OUTPUT_VARIABLE output
)
if(NOT result)
_ipo_not_supported("${output}")
return()
endif()
endmacro()
function(check_ipo_supported)
cmake_policy(GET CMP0069 x)
string(COMPARE EQUAL "${x}" "" not_set)
if(not_set)
message(FATAL_ERROR "Policy CMP0069 is not set")
endif()
string(COMPARE EQUAL "${x}" "OLD" is_old)
if(is_old)
message(FATAL_ERROR "Policy CMP0069 set to OLD")
endif()
set(optional)
set(one RESULT OUTPUT)
set(multiple LANGUAGES)
# Introduce:
# * X_RESULT
# * X_OUTPUT
# * X_LANGUAGES
cmake_parse_arguments(X "${optional}" "${one}" "${multiple}" "${ARGV}")
string(COMPARE NOTEQUAL "${X_UNPARSED_ARGUMENTS}" "" has_unparsed)
if(has_unparsed)
message(FATAL_ERROR "Unparsed arguments: ${X_UNPARSED_ARGUMENTS}")
endif()
string(COMPARE EQUAL "${X_LANGUAGES}" "" no_languages)
if(no_languages)
# User did not set any languages, use defaults
get_property(enabled_languages GLOBAL PROPERTY ENABLED_LANGUAGES)
string(COMPARE EQUAL "${enabled_languages}" "" no_languages)
if(no_languages)
_ipo_not_supported(
"no languages found in ENABLED_LANGUAGES global property"
)
return()
endif()
set(languages "")
list(FIND enabled_languages "CXX" result)
if(NOT result EQUAL -1)
list(APPEND languages "CXX")
endif()
list(FIND enabled_languages "C" result)
if(NOT result EQUAL -1)
list(APPEND languages "C")
endif()
list(FIND enabled_languages "Fortran" result)
if(NOT result EQUAL -1)
list(APPEND languages "Fortran")
endif()
string(COMPARE EQUAL "${languages}" "" no_languages)
if(no_languages)
_ipo_not_supported(
"no C/CXX/Fortran languages found in ENABLED_LANGUAGES global property"
)
return()
endif()
else()
set(languages "${X_LANGUAGES}")
set(unsupported_languages "${languages}")
list(REMOVE_ITEM unsupported_languages "C" "CXX" "Fortran")
string(COMPARE NOTEQUAL "${unsupported_languages}" "" has_unsupported)
if(has_unsupported)
_ipo_not_supported(
"language(s) '${unsupported_languages}' not supported"
)
return()
endif()
endif()
foreach(lang ${languages})
if(NOT _CMAKE_${lang}_IPO_SUPPORTED_BY_CMAKE)
_ipo_not_supported("CMake doesn't support IPO for current ${lang} compiler")
return()
endif()
if(NOT _CMAKE_${lang}_IPO_MAY_BE_SUPPORTED_BY_COMPILER)
_ipo_not_supported("${lang} compiler doesn't support IPO")
return()
endif()
endforeach()
if(CMAKE_GENERATOR MATCHES "^Visual Studio ")
_ipo_not_supported("CMake doesn't support IPO for current generator")
return()
endif()
foreach(x ${languages})
_ipo_run_language_check(${x})
endforeach()
set("${X_RESULT}" YES PARENT_SCOPE)
endfunction()
|
