diff options
Diffstat (limited to 'CMakeLists.txt')
| -rw-r--r-- | CMakeLists.txt | 105 |
1 files changed, 68 insertions, 37 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt index 1eafa407..74a3a4ca 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -5,7 +5,7 @@ # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # -# http://www.apache.org/licenses/LICENSE-2.0 +# 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, @@ -14,44 +14,40 @@ # limitations under the License. # -# We require 3.0 for modern, target-based CMake. We require 3.1 for the use of -# CXX_STANDARD in our targets. -cmake_minimum_required(VERSION 3.1) +# 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() - -project(absl) +cmake_policy(SET CMP0025 NEW) -list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/CMake) +# if command can use IN_LIST +cmake_policy(SET CMP0057 NEW) -include(GNUInstallDirs) -include(AbseilHelpers) +# Project version variables are the empty std::string if version is unspecified +cmake_policy(SET CMP0048 NEW) +project(absl CXX) -# config options -if (MSVC) - # /wd4005 macro-redefinition - # /wd4068 unknown pragma - # /wd4244 conversion from 'type1' to 'type2' - # /wd4267 conversion from 'size_t' to 'type2' - # /wd4800 force value to bool 'true' or 'false' (performance warning) - add_compile_options(/W3 /wd4005 /wd4068 /wd4244 /wd4267 /wd4800) - # /D_ENABLE_EXTENDED_ALIGNED_STORAGE Introduced in VS 2017 15.8, before the - # member type would non-conformingly have an alignment of only alignof(max_align_t). - add_definitions( - /DNOMINMAX - /DWIN32_LEAN_AND_MEAN=1 - /D_CRT_SECURE_NO_WARNINGS - /D_SCL_SECURE_NO_WARNINGS - /D_ENABLE_EXTENDED_ALIGNED_STORAGE - ) +# when absl is included as subproject (i.e. using add_subdirectory(abseil-cpp)) +# in the source tree of a project that uses it, install rules are disabled. +if(NOT "^${CMAKE_SOURCE_DIR}$" STREQUAL "^${PROJECT_SOURCE_DIR}$") + set(ABSL_ENABLE_INSTALL FALSE) else() - set(ABSL_STD_CXX_FLAG "-std=c++11" CACHE STRING "c++ std flag (default: c++11)") + 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) ## @@ -68,12 +64,6 @@ endif() # include current path list(APPEND ABSL_COMMON_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}) -# -std=X -set(CMAKE_CXX_FLAGS "${ABSL_STD_CXX_FLAG} ${CMAKE_CXX_FLAGS}") - -# -fexceptions -set(ABSL_EXCEPTIONS_FLAG "${CMAKE_CXX_EXCEPTIONS}") - if("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang") set(ABSL_USING_CLANG ON) else() @@ -100,7 +90,9 @@ endif() if(BUILD_TESTING) if(${ABSL_USE_GOOGLETEST_HEAD}) - include(CMake/DownloadGTest.cmake) + 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) @@ -116,3 +108,42 @@ if(BUILD_TESTING) endif() add_subdirectory(absl) + +if(ABSL_ENABLE_INSTALL) + + # 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 |