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
|
#
# Copyright 2017 The Abseil Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Most widely used distributions have cmake 3.5 or greater available as of March
# 2019. A notable exception is RHEL-7 (CentOS7). You can install a current
# version of CMake by first installing Extra Packages for Enterprise Linux
# (https://fedoraproject.org/wiki/EPEL#Extra_Packages_for_Enterprise_Linux_.28EPEL.29)
# and then issuing `yum install cmake3` on the command line.
cmake_minimum_required(VERSION 3.5)
# Compiler id for Apple Clang is now AppleClang.
if (POLICY CMP0025)
cmake_policy(SET CMP0025 NEW)
endif (POLICY CMP0025)
# if command can use IN_LIST
if (POLICY CMP0057)
cmake_policy(SET CMP0057 NEW)
endif (POLICY CMP0057)
# Project version variables are the empty string if version is unspecified
if (POLICY CMP0048)
cmake_policy(SET CMP0048 NEW)
endif (POLICY CMP0048)
# option() honor variables
if (POLICY CMP0077)
cmake_policy(SET CMP0077 NEW)
endif (POLICY CMP0077)
# Allow the user to specify the MSVC runtime
if (POLICY CMP0091)
cmake_policy(SET CMP0091 NEW)
endif (POLICY CMP0091)
# Set BUILD_TESTING to OFF by default.
# This must come before the project() and include(CTest) lines.
OPTION(BUILD_TESTING "Build tests" OFF)
project(absl LANGUAGES CXX)
include(CTest)
# Output directory is correct by default for most build setups. However, when
# building Abseil as a DLL, it is important to have the DLL in the same
# directory as the executable using it. Thus, we put all executables in a single
# /bin directory.
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
# when absl is included as subproject (i.e. using add_subdirectory(abseil-cpp))
# in the source tree of a project that uses it, install rules are disabled.
if(NOT CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
option(ABSL_ENABLE_INSTALL "Enable install rule" OFF)
else()
option(ABSL_ENABLE_INSTALL "Enable install rule" ON)
endif()
list(APPEND CMAKE_MODULE_PATH
${CMAKE_CURRENT_LIST_DIR}/CMake
${CMAKE_CURRENT_LIST_DIR}/absl/copts
)
include(CMakePackageConfigHelpers)
include(GNUInstallDirs)
include(AbseilDll)
include(AbseilHelpers)
##
## Using absl targets
##
## all public absl targets are
## exported with the absl:: prefix
##
## e.g absl::base absl::synchronization absl::strings ....
##
## DO NOT rely on the internal targets outside of the prefix
# include current path
list(APPEND ABSL_COMMON_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR})
if("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
set(ABSL_USING_CLANG ON)
else()
set(ABSL_USING_CLANG OFF)
endif()
# find dependencies
## pthread
find_package(Threads REQUIRED)
option(ABSL_USE_EXTERNAL_GOOGLETEST
"If ON, Abseil will assume that the targets for GoogleTest are already provided by the including project. This makes sense when Abseil is used with add_subproject." OFF)
option(ABSL_USE_GOOGLETEST_HEAD
"If ON, abseil will download HEAD from GoogleTest at config time." OFF)
set(ABSL_GOOGLETEST_DOWNLOAD_URL "" CACHE STRING "If set, download GoogleTest from this URL")
set(ABSL_LOCAL_GOOGLETEST_DIR "/usr/src/googletest" CACHE PATH
"If ABSL_USE_GOOGLETEST_HEAD is OFF and ABSL_GOOGLETEST_URL is not set, specifies the directory of a local GoogleTest checkout."
)
if(BUILD_TESTING)
## check targets
if (NOT ABSL_USE_EXTERNAL_GOOGLETEST)
set(absl_gtest_build_dir ${CMAKE_BINARY_DIR}/googletest-build)
if(ABSL_USE_GOOGLETEST_HEAD AND ABSL_GOOGLETEST_DOWNLOAD_URL)
message(FATAL_ERROR "Do not set both ABSL_USE_GOOGLETEST_HEAD and ABSL_GOOGLETEST_DOWNLOAD_URL")
endif()
if(ABSL_USE_GOOGLETEST_HEAD)
set(absl_gtest_download_url "https://github.com/google/googletest/archive/master.zip")
elseif(ABSL_GOOGLETEST_DOWNLOAD_URL)
set(absl_gtest_download_url ${ABSL_GOOGLETEST_DOWNLOAD_URL})
endif()
if(absl_gtest_download_url)
set(absl_gtest_src_dir ${CMAKE_BINARY_DIR}/googletest-src)
else()
set(absl_gtest_src_dir ${ABSL_LOCAL_GOOGLETEST_DIR})
endif()
include(CMake/Googletest/DownloadGTest.cmake)
endif()
check_target(gtest)
check_target(gtest_main)
check_target(gmock)
list(APPEND ABSL_TEST_COMMON_LIBRARIES
gtest_main
gtest
gmock
${CMAKE_THREAD_LIBS_INIT}
)
endif()
add_subdirectory(absl)
if(ABSL_ENABLE_INSTALL)
# absl:lts-remove-begin(system installation is supported for LTS releases)
# We don't support system-wide installation
list(APPEND SYSTEM_INSTALL_DIRS "/usr/local" "/usr" "/opt/" "/opt/local" "c:/Program Files/${PROJECT_NAME}")
if(NOT DEFINED CMAKE_INSTALL_PREFIX OR CMAKE_INSTALL_PREFIX IN_LIST SYSTEM_INSTALL_DIRS)
message(WARNING "\
The default and system-level install directories are unsupported except in LTS \
releases of Abseil. Please set CMAKE_INSTALL_PREFIX to install Abseil in your \
source or build tree directly.\
")
endif()
# absl:lts-remove-end
# install as a subdirectory only
install(EXPORT ${PROJECT_NAME}Targets
NAMESPACE absl::
DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
)
configure_package_config_file(
CMake/abslConfig.cmake.in
"${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
INSTALL_DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
)
install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
)
# Abseil only has a version in LTS releases. This mechanism is accomplished
# Abseil's internal Copybara (https://github.com/google/copybara) workflows and
# isn't visible in the CMake buildsystem itself.
if(absl_VERSION)
write_basic_package_version_file(
"${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
COMPATIBILITY ExactVersion
)
install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
)
endif() # absl_VERSION
install(DIRECTORY absl
DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
FILES_MATCHING
PATTERN "*.inc"
PATTERN "*.h"
PATTERN "copts" EXCLUDE
PATTERN "testdata" EXCLUDE
)
endif() # ABSL_ENABLE_INSTALL
|
