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