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-rw-r--r--CMakeLists.txt66
1 files changed, 42 insertions, 24 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3f4fbdcf..ad55fa47 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,13 +22,14 @@
cmake_minimum_required(VERSION 3.5)
# Compiler id for Apple Clang is now AppleClang.
-if (POLICY CMP0025)
- cmake_policy(SET CMP0025 NEW)
-endif()
+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)
# when absl is included as subproject (i.e. using add_subdirectory(abseil-cpp))
@@ -44,7 +45,7 @@ list(APPEND CMAKE_MODULE_PATH
${CMAKE_CURRENT_LIST_DIR}/absl/copts
)
-include(GNUInstallDirs)
+include(AbseilInstallDirs)
include(CMakePackageConfigHelpers)
include(AbseilHelpers)
@@ -85,6 +86,7 @@ if(${ABSL_RUN_TESTS})
enable_testing()
endif()
+# 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)
@@ -94,6 +96,7 @@ releases of Abseil. Please set CMAKE_INSTALL_PREFIX to install Abseil in your \
source or build tree directly.\
")
endif()
+# absl:lts-remove-end
## check targets
if(BUILD_TESTING)
@@ -118,25 +121,40 @@ endif()
add_subdirectory(absl)
-# 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}"
-)
+if (ABSL_ENABLE_INSTALL)
+ # install as a subdirectory only
+ install(EXPORT ${PROJECT_NAME}Targets
+ NAMESPACE absl::
+ DESTINATION "${ABSL_INSTALL_CONFIGDIR}"
+ )
-install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
- DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
-)
+ 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}"
+ )
-install(DIRECTORY absl
- DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
- FILES_MATCHING
- PATTERN "*.inc"
- PATTERN "*.h"
-)
+ # Abseil only has a version in LTS releases. This mechanism is accomplished
+ # Abseil's internal Copybara (https://github.com/google/copybara) workflows and
+ # isn't visible in the CMake buildsystem itself.
+ if (absl_VERSION)
+ write_basic_package_version_file(
+ "${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