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diff --git a/tree/CMakeLists.txt b/tree/CMakeLists.txt
index 4fd1b1a..f0d072b 100644
--- a/tree/CMakeLists.txt
+++ b/tree/CMakeLists.txt
@@ -50,70 +50,79 @@ if(APPLE)
set (CMAKE_FIND_FRAMEWORK LAST)
endif()
-# Fetch pybind to be able to use pybind11_add_module symbol.
-set(PYBIND_VER v2.10.1)
-include(FetchContent)
-FetchContent_Declare(
- pybind11
- GIT_REPOSITORY https://github.com/pybind/pybind11
- GIT_TAG ${PYBIND_VER}
-)
-if(NOT pybind11_POPULATED)
- FetchContent_Populate(pybind11)
- add_subdirectory(${pybind11_SOURCE_DIR} ${pybind11_BINARY_DIR})
- include_directories(${pybind11_INCLUDE_DIR})
-endif()
-
-# Needed to disable Abseil tests.
-set (BUILD_TESTING OFF)
-
-# Include abseil-cpp.
-set(ABSEIL_VER 20210324.2)
-include(ExternalProject)
-set(ABSEIL_CMAKE_ARGS
- "-DCMAKE_INSTALL_PREFIX=${CMAKE_SOURCE_DIR}/abseil-cpp"
- "-DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}"
- "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
- "-DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}"
- "-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}"
- "-DCMAKE_POSITION_INDEPENDENT_CODE=${CMAKE_POSITION_INDEPENDENT_CODE}"
- "-DLIBRARY_OUTPUT_PATH=${CMAKE_SOURCE_DIR}/abseil-cpp/lib")
-if(DEFINED CMAKE_OSX_ARCHITECTURES)
- set(ABSEIL_CMAKE_ARGS
- ${ABSEIL_CMAKE_ARGS}
- "-DCMAKE_OSX_ARCHITECTURES=${CMAKE_OSX_ARCHITECTURES}")
+find_package(pybind11 CONFIG)
+
+if (NOT pybind11_FOUND)
+ # Fetch pybind to be able to use pybind11_add_module symbol.
+ set(PYBIND_VER v2.10.1)
+ include(FetchContent)
+ FetchContent_Declare(
+ pybind11
+ GIT_REPOSITORY https://github.com/pybind/pybind11
+ GIT_TAG ${PYBIND_VER}
+ )
+ if(NOT pybind11_POPULATED)
+ FetchContent_Populate(pybind11)
+ add_subdirectory(${pybind11_SOURCE_DIR} ${pybind11_BINARY_DIR})
+ include_directories(${pybind11_INCLUDE_DIR})
+ endif()
endif()
-ExternalProject_Add(abseil-cpp
- GIT_REPOSITORY https://github.com/abseil/abseil-cpp.git
- GIT_TAG ${ABSEIL_VER}
- PREFIX ${CMAKE_SOURCE_DIR}/abseil-cpp
- CMAKE_ARGS ${ABSEIL_CMAKE_ARGS}
-)
-ExternalProject_Get_Property(abseil-cpp install_dir)
-set(abseil_install_dir ${install_dir})
-include_directories (${abseil_install_dir}/include)
-
# Define pybind11 tree module.
pybind11_add_module(_tree tree.h tree.cc)
-add_dependencies(_tree abseil-cpp)
-
+find_package(absl)
+
+if (NOT absl_FOUND)
+ # Needed to disable Abseil tests.
+ set (BUILD_TESTING OFF)
+
+ # Include abseil-cpp.
+ set(ABSEIL_VER 20210324.2)
+ include(ExternalProject)
+ set(ABSEIL_CMAKE_ARGS
+ "-DCMAKE_INSTALL_PREFIX=${CMAKE_SOURCE_DIR}/abseil-cpp"
+ "-DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}"
+ "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
+ "-DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}"
+ "-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}"
+ "-DCMAKE_POSITION_INDEPENDENT_CODE=${CMAKE_POSITION_INDEPENDENT_CODE}"
+ "-DLIBRARY_OUTPUT_PATH=${CMAKE_SOURCE_DIR}/abseil-cpp/lib")
+ if(DEFINED CMAKE_OSX_ARCHITECTURES)
+ set(ABSEIL_CMAKE_ARGS
+ ${ABSEIL_CMAKE_ARGS}
+ "-DCMAKE_OSX_ARCHITECTURES=${CMAKE_OSX_ARCHITECTURES}")
+ endif()
+ ExternalProject_Add(abseil-cpp
+ GIT_REPOSITORY https://github.com/abseil/abseil-cpp.git
+ GIT_TAG ${ABSEIL_VER}
+ PREFIX ${CMAKE_SOURCE_DIR}/abseil-cpp
+ CMAKE_ARGS ${ABSEIL_CMAKE_ARGS}
+ )
+ ExternalProject_Get_Property(abseil-cpp install_dir)
+ set(abseil_install_dir ${install_dir})
+ include_directories (${abseil_install_dir}/include)
+
+ add_dependencies(_tree abseil-cpp)
+
+ if (WIN32 OR MSVC)
+ set(ABSEIL_LIB_PREF "absl")
+ set(LIB_SUFF "lib")
+ else()
+ set(ABSEIL_LIB_PREF "libabsl")
+ set(LIB_SUFF "a")
+ endif()
+
-if (WIN32 OR MSVC)
- set(ABSEIL_LIB_PREF "absl")
- set(LIB_SUFF "lib")
+ # Link abseil static libs.
+ # We don't use find_library here to force cmake to build abseil before linking.
+ set(ABSEIL_LIBS int128 raw_hash_set raw_logging_internal strings throw_delegate)
+ foreach(ABSEIL_LIB IN LISTS ABSEIL_LIBS)
+ target_link_libraries(_tree PRIVATE
+ "${abseil_install_dir}/lib/${ABSEIL_LIB_PREF}_${ABSEIL_LIB}.${LIB_SUFF}")
+ endforeach()
else()
- set(ABSEIL_LIB_PREF "libabsl")
- set(LIB_SUFF "a")
+ target_link_libraries(_tree PRIVATE absl::int128 absl::raw_hash_set absl::raw_logging_internal absl::strings absl::throw_delegate)
endif()
-# Link abseil static libs.
-# We don't use find_library here to force cmake to build abseil before linking.
-set(ABSEIL_LIBS int128 raw_hash_set raw_logging_internal strings throw_delegate)
-foreach(ABSEIL_LIB IN LISTS ABSEIL_LIBS)
- target_link_libraries(_tree PRIVATE
- "${abseil_install_dir}/lib/${ABSEIL_LIB_PREF}_${ABSEIL_LIB}.${LIB_SUFF}")
-endforeach()
-
# Make the module private to tree package.
set_target_properties(_tree PROPERTIES OUTPUT_NAME tree/_tree)
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