| # |
| # 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) |
| |
| 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 ${CMAKE_BINARY_DIR}/bin) |
| |
| # when absl is included as subproject (i.e. using add_subdirectory(abseil-cpp)) |
| # in the source tree of a project that uses it, install rules are disabled. |
| if(NOT CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR) |
| option(ABSL_ENABLE_INSTALL "Enable install rule" OFF) |
| else() |
| option(ABSL_ENABLE_INSTALL "Enable install rule" ON) |
| endif() |
| |
| option(ABSL_PROPAGATE_CXX_STD |
| "Use CMake C++ standard meta features (e.g. cxx_std_11) that propagate to targets that link to Abseil" |
| OFF) # TODO: Default to ON for CMake 3.8 and greater. |
| if((${CMAKE_VERSION} VERSION_GREATER_EQUAL 3.8) AND (NOT ABSL_PROPAGATE_CXX_STD)) |
| 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.") |
| 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) |
| |
| include(CMakeDependentOption) |
| |
| option(ABSL_BUILD_TESTING |
| "If ON, Abseil will build all of Abseil's own tests." OFF) |
| |
| 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) |
| |
| cmake_dependent_option(ABSL_FIND_GOOGLETEST |
| "If ON, Abseil will use find_package(GTest) rather than assuming that GoogleTest is already provided by the including project." |
| ON |
| "ABSL_USE_EXTERNAL_GOOGLETEST" |
| 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 AND ABSL_BUILD_TESTING) |
| ## check targets |
| if (ABSL_USE_EXTERNAL_GOOGLETEST) |
| if (ABSL_FIND_GOOGLETEST) |
| find_package(GTest REQUIRED) |
| else() |
| if (NOT TARGET gtest AND NOT TARGET GTest::gtest) |
| 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.") |
| endif() |
| endif() |
| else() |
| 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/main.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 ${ABSL_LOCAL_GOOGLETEST_DIR}) |
| endif() |
| include(CMake/Googletest/DownloadGTest.cmake) |
| endif() |
| |
| if (NOT ABSL_FIND_GOOGLETEST) |
| # When Google Test is included directly rather than through find_package, the aliases are missing. |
| add_library(GTest::gtest ALIAS gtest) |
| add_library(GTest::gtest_main ALIAS gtest_main) |
| add_library(GTest::gmock ALIAS gmock) |
| add_library(GTest::gmock_main ALIAS gmock_main) |
| endif() |
| |
| check_target(GTest::gtest) |
| check_target(GTest::gtest_main) |
| check_target(GTest::gmock) |
| check_target(GTest::gmock_main) |
| endif() |
| |
| add_subdirectory(absl) |
| |
| if(ABSL_ENABLE_INSTALL) |
| # absl:lts-remove-begin(system installation is supported for LTS releases) |
| # We don't support system-wide installation |
| list(APPEND SYSTEM_INSTALL_DIRS "/usr/local" "/usr" "/opt/" "/opt/local" "c:/Program Files/${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 |