$NetBSD: patch-tree_CMakeLists.txt,v 1.2 2025/04/15 16:02:34 adam Exp $

Use system pybind11 and absl.
https://github.com/google-deepmind/tree/pull/73

--- tree/CMakeLists.txt.orig	2025-01-30 17:23:48.000000000 +0000
+++ tree/CMakeLists.txt
@@ -7,8 +7,8 @@ cmake_policy(SET CMP0135 NEW)
 
 project (tree LANGUAGES CXX)
 
-option(USE_SYSTEM_ABSEIL "Force use of system abseil-cpp" OFF)
-option(USE_SYSTEM_PYBIND11 "Force use of system pybind11" OFF)
+option(USE_SYSTEM_ABSEIL "Force use of system abseil-cpp" ON)
+option(USE_SYSTEM_PYBIND11 "Force use of system pybind11" ON)
 
 # Required for Python.h and python binding.
 find_package(Python3 COMPONENTS Interpreter Development)
@@ -57,9 +57,6 @@ if(APPLE)
   set (CMAKE_FIND_FRAMEWORK LAST)
 endif()
 
-# Use `FetchContent` module to manage all external dependencies (i.e.
-# abseil-cpp and pybind11).
-include(FetchContent)
 
 # Needed to disable Abseil tests.
 set(BUILD_TESTING OFF)
@@ -70,45 +67,14 @@ if (USE_SYSTEM_ABSEIL)
     set(ABSEIL_FIND_PACKAGE_ARGS FIND_PACKAGE_ARGS)
 endif()
 
-# Include abseil-cpp.
-set(ABSEIL_REPO https://github.com/abseil/abseil-cpp)
-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"
-  "-DABSL_PROPAGATE_CXX_STD=ON")
-if(DEFINED CMAKE_OSX_ARCHITECTURES)
-  set(ABSEIL_CMAKE_ARGS
-      ${ABSEIL_CMAKE_ARGS}
-      "-DCMAKE_OSX_ARCHITECTURES=${CMAKE_OSX_ARCHITECTURES}")
-endif()
-
-FetchContent_Declare(
-  absl
-  URL         ${ABSEIL_REPO}/archive/refs/tags/20220623.2.tar.gz
-  URL_HASH    SHA256=773652c0fc276bcd5c461668dc112d0e3b6cde499600bfe3499c5fdda4ed4a5b
-  CMAKE_ARGS  ${ABSEIL_CMAKE_ARGS}
-  EXCLUDE_FROM_ALL
-  ${ABSEIL_FIND_PACKAGE_ARGS})
-
 # Try to find pybind11 package system-wide first.
 if (USE_SYSTEM_PYBIND11)
     message(STATUS "Use system pybind11: ${USE_SYSTEM_PYBIND11}")
     set(PYBIND11_FIND_PACKAGE_ARGS FIND_PACKAGE_ARGS)
 endif()
 
-FetchContent_Declare(
-  pybind11
-  URL       https://github.com/pybind/pybind11/archive/refs/tags/v2.10.1.tar.gz
-  URL_HASH  SHA256=111014b516b625083bef701df7880f78c2243835abdb263065b6b59b960b6bad
-  ${PYBIND11_FIND_PACKAGE_ARGS})
-
-FetchContent_MakeAvailable(absl pybind11)
-
+find_package(pybind11 REQUIRED CONFIG)
+find_package(absl REQUIRED)
 # Define pybind11 tree module.
 pybind11_add_module(_tree tree.h tree.cc)