Abseil Common Libraries (C++) (grcp 依赖)
https://abseil.io/
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249 lines
8.6 KiB
249 lines
8.6 KiB
# |
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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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# https://github.com/google/oss-policies-info/blob/main/foundational-cxx-support-matrix.md |
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# As of 2022-09-06, CMake 3.10 is the minimum supported version. |
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cmake_minimum_required(VERSION 3.10) |
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# Compiler id for Apple Clang is now AppleClang. |
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if (POLICY CMP0025) |
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cmake_policy(SET CMP0025 NEW) |
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endif (POLICY CMP0025) |
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# if command can use IN_LIST |
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if (POLICY CMP0057) |
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cmake_policy(SET CMP0057 NEW) |
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endif (POLICY CMP0057) |
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# Project version variables are the empty string if version is unspecified |
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if (POLICY CMP0048) |
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cmake_policy(SET CMP0048 NEW) |
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endif (POLICY CMP0048) |
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# option() honor variables |
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if (POLICY CMP0077) |
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cmake_policy(SET CMP0077 NEW) |
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endif (POLICY CMP0077) |
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# Allow the user to specify the MSVC runtime |
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if (POLICY CMP0091) |
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cmake_policy(SET CMP0091 NEW) |
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endif (POLICY CMP0091) |
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# try_compile() honors the CMAKE_CXX_STANDARD value |
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if (POLICY CMP0067) |
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cmake_policy(SET CMP0067 NEW) |
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endif (POLICY CMP0067) |
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project(absl LANGUAGES CXX) |
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include(CTest) |
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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 ${CMAKE_BINARY_DIR}/bin) |
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# when absl is included as subproject (i.e. using add_subdirectory(abseil-cpp)) |
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# in the source tree of a project that uses it, install rules are disabled. |
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if(NOT CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR) |
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option(ABSL_ENABLE_INSTALL "Enable install rule" OFF) |
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else() |
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option(ABSL_ENABLE_INSTALL "Enable install rule" ON) |
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endif() |
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option(ABSL_PROPAGATE_CXX_STD |
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"Use CMake C++ standard meta features (e.g. cxx_std_14) that propagate to targets that link to Abseil" |
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OFF) # TODO: Default to ON for CMake 3.8 and greater. |
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if((${CMAKE_VERSION} VERSION_GREATER_EQUAL 3.8) AND (NOT ABSL_PROPAGATE_CXX_STD)) |
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message(WARNING "A future Abseil release will default ABSL_PROPAGATE_CXX_STD to ON for CMake 3.8 and up. We recommend enabling this option to ensure your project still builds correctly.") |
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endif() |
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option(ABSL_USE_SYSTEM_INCLUDES |
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"Silence warnings in Abseil headers by marking them as SYSTEM includes" |
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OFF) |
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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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include(CMakePackageConfigHelpers) |
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include(GNUInstallDirs) |
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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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include(CMakeDependentOption) |
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option(ABSL_BUILD_TESTING |
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"If ON, Abseil will build all of Abseil's own tests." OFF) |
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option(ABSL_BUILD_TEST_HELPERS |
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"If ON, Abseil will build libraries that you can use to write tests against Abseil code. This option requires that Abseil is configured to use GoogleTest." |
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OFF) |
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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_subdirectory." OFF) |
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cmake_dependent_option(ABSL_FIND_GOOGLETEST |
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"If ON, Abseil will use find_package(GTest) rather than assuming that GoogleTest is already provided by the including project." |
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ON |
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"ABSL_USE_EXTERNAL_GOOGLETEST" |
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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_GOOGLETEST_DOWNLOAD_URL "" CACHE STRING "If set, download GoogleTest from this URL") |
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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 and ABSL_GOOGLETEST_URL is not set, specifies the directory of a local GoogleTest checkout." |
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) |
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if((BUILD_TESTING AND ABSL_BUILD_TESTING) OR ABSL_BUILD_TEST_HELPERS) |
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if (ABSL_USE_EXTERNAL_GOOGLETEST) |
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if (ABSL_FIND_GOOGLETEST) |
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find_package(GTest REQUIRED) |
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elseif(NOT TARGET GTest::gtest) |
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if(TARGET gtest) |
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# When Google Test is included directly rather than through find_package, the aliases are missing. |
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add_library(GTest::gtest ALIAS gtest) |
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add_library(GTest::gtest_main ALIAS gtest_main) |
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add_library(GTest::gmock ALIAS gmock) |
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add_library(GTest::gmock_main ALIAS gmock_main) |
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else() |
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message(FATAL_ERROR "ABSL_USE_EXTERNAL_GOOGLETEST is ON and ABSL_FIND_GOOGLETEST is OFF, which means that the top-level project must build the Google Test project. However, the target gtest was not found.") |
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endif() |
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endif() |
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else() |
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set(absl_gtest_build_dir ${CMAKE_BINARY_DIR}/googletest-build) |
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if(ABSL_USE_GOOGLETEST_HEAD AND ABSL_GOOGLETEST_DOWNLOAD_URL) |
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message(FATAL_ERROR "Do not set both ABSL_USE_GOOGLETEST_HEAD and ABSL_GOOGLETEST_DOWNLOAD_URL") |
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endif() |
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if(ABSL_USE_GOOGLETEST_HEAD) |
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set(absl_gtest_download_url "https://github.com/google/googletest/archive/main.zip") |
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elseif(ABSL_GOOGLETEST_DOWNLOAD_URL) |
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set(absl_gtest_download_url ${ABSL_GOOGLETEST_DOWNLOAD_URL}) |
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endif() |
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if(absl_gtest_download_url) |
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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 ${ABSL_LOCAL_GOOGLETEST_DIR}) |
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endif() |
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include(CMake/Googletest/DownloadGTest.cmake) |
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endif() |
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endif() |
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add_subdirectory(absl) |
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if(ABSL_ENABLE_INSTALL) |
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# absl:lts-remove-begin(system installation is supported for LTS releases) |
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# We don't support system-wide installation |
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list(APPEND SYSTEM_INSTALL_DIRS "/usr/local" "/usr" "/opt/" "/opt/local" "c:/Program Files/${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 ${PROJECT_NAME}Targets |
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NAMESPACE absl:: |
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DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}" |
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) |
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configure_package_config_file( |
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CMake/abslConfig.cmake.in |
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"${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake" |
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INSTALL_DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}" |
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) |
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install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake" |
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DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}" |
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) |
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# Abseil only has a version in LTS releases. This mechanism is accomplished |
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# Abseil's internal Copybara (https://github.com/google/copybara) workflows and |
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# isn't visible in the CMake buildsystem itself. |
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if(absl_VERSION) |
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write_basic_package_version_file( |
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"${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}/${PROJECT_NAME}ConfigVersion.cmake" |
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DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}" |
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) |
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endif() # absl_VERSION |
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install(DIRECTORY absl |
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DESTINATION ${CMAKE_INSTALL_INCLUDEDIR} |
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FILES_MATCHING |
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PATTERN "*.inc" |
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PATTERN "*.h" |
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PATTERN "copts" EXCLUDE |
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PATTERN "testdata" EXCLUDE |
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) |
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file(READ "absl/base/options.h" ABSL_INTERNAL_OPTIONS_H_CONTENTS) |
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if (ABSL_INTERNAL_AT_LEAST_CXX17) |
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string(REGEX REPLACE |
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"#define ABSL_OPTION_USE_STD_([^ ]*) 2" |
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"#define ABSL_OPTION_USE_STD_\\1 1" |
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ABSL_INTERNAL_OPTIONS_H_PINNED |
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"${ABSL_INTERNAL_OPTIONS_H_CONTENTS}") |
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else() |
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string(REGEX REPLACE |
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"#define ABSL_OPTION_USE_STD_([^ ]*) 2" |
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"#define ABSL_OPTION_USE_STD_\\1 0" |
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ABSL_INTERNAL_OPTIONS_H_PINNED |
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"${ABSL_INTERNAL_OPTIONS_H_CONTENTS}") |
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endif() |
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file(WRITE "${CMAKE_BINARY_DIR}/options-pinned.h" "${ABSL_INTERNAL_OPTIONS_H_PINNED}") |
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install(FILES "${CMAKE_BINARY_DIR}/options-pinned.h" |
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DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/absl/base |
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RENAME "options.h") |
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endif() # ABSL_ENABLE_INSTALL
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