Squashed 'third_party/abseil/' content from commit ddf8e52a2
Change-Id: I330cdc687395c6605ad027b855e313ff4a2059e9
git-subtree-dir: third_party/abseil
git-subtree-split: ddf8e52a2918dd0ccec75d3e2426125fa3926724
diff --git a/CMakeLists.txt b/CMakeLists.txt
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+#
+# 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.
+cmake_policy(SET CMP0025 NEW)
+
+# if command can use IN_LIST
+cmake_policy(SET CMP0057 NEW)
+
+# Project version variables are the empty std::string if version is unspecified
+cmake_policy(SET CMP0048 NEW)
+
+project(absl CXX)
+
+# 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 "^${PROJECT_SOURCE_DIR}$")
+ set(ABSL_ENABLE_INSTALL FALSE)
+else()
+ set(ABSL_ENABLE_INSTALL TRUE)
+endif()
+
+list(APPEND CMAKE_MODULE_PATH
+ ${CMAKE_CURRENT_LIST_DIR}/CMake
+ ${CMAKE_CURRENT_LIST_DIR}/absl/copts
+)
+
+include(AbseilInstallDirs)
+include(CMakePackageConfigHelpers)
+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_GOOGLETEST_HEAD
+ "If ON, abseil will download HEAD from googletest at config time." OFF)
+
+option(ABSL_RUN_TESTS "If ON, Abseil tests will be run." OFF)
+
+if(${ABSL_RUN_TESTS})
+ # enable CTest. This will set BUILD_TESTING to ON unless otherwise specified
+ # on the command line
+ include(CTest)
+ enable_testing()
+endif()
+
+## check targets
+if(BUILD_TESTING)
+
+ if(${ABSL_USE_GOOGLETEST_HEAD})
+ include(CMake/Googletest/DownloadGTest.cmake)
+ set(absl_gtest_src_dir ${CMAKE_BINARY_DIR}/googletest-src)
+ set(absl_gtest_build_dir ${CMAKE_BINARY_DIR}/googletest-build)
+ 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 ${PROJECT_NAME}Targets
+ NAMESPACE absl::
+ DESTINATION "${ABSL_INSTALL_CONFIGDIR}"
+ )
+
+ configure_package_config_file(
+ CMake/abslConfig.cmake.in
+ "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
+ INSTALL_DESTINATION "${ABSL_INSTALL_CONFIGDIR}"
+ )
+ install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
+ DESTINATION "${ABSL_INSTALL_CONFIGDIR}"
+ )
+
+ # 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 ${ABSL_INSTALL_CONFIGDIR}
+ )
+ endif() # absl_VERSION
+
+ install(DIRECTORY absl
+ DESTINATION ${ABSL_INSTALL_INCLUDEDIR}
+ FILES_MATCHING
+ PATTERN "*.inc"
+ PATTERN "*.h"
+ )
+endif() # ABSL_ENABLE_INSTALL