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Add CMake build
- Add CMakeLists.txt to build the native and wrapped proto caster libraries - Use FetchContent to retrieve dependencies. - Base dependencies on version from google/or-tools. - Declare all fetch content dependencies before calling make available . - Use CACHE INTERNAL to disable protobuf tests. - Set dependency versions to match those in google/or-tools. Signed-off-by: Rhys Mainwaring <[email protected]>
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‎CMakeLists.txt

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cmake_minimum_required(VERSION 3.18)
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list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
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project(pybind11_protobuf )
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if(MSVC)
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set(CMAKE_CXX_STANDARD 20)
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else()
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set(CMAKE_CXX_STANDARD 17)
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endif()
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set(CMAKE_CXX_STANDARD_REQUIRED ON)
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set(CMAKE_CXX_EXTENSIONS OFF)
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#============================================================================
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# Options
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option(BUILD_absl "Build the abseil-cpp dependency Library" ON)
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message(STATUS "Build abseil-cpp: ${BUILD_absl}")
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option(BUILD_protobuf "Build the Protobuf dependency Library" ON)
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message(STATUS "Build protobuf: ${BUILD_protobuf}")
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option(BUILD_pybind11 "Build the pybind11 dependency Library" ON)
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message(STATUS "Python: Build pybind11: ${BUILD_pybind11}")
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#============================================================================
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# Find Python
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find_package(Python COMPONENTS Interpreter Development)
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#============================================================================
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# Build dependencies
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add_subdirectory(cmake/dependencies dependencies)
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include(deps)
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include(CMakeFindDependencyMacro)
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include(FindProtobuf)
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if (NOT protobuf_FOUND AND NOT PROTOBUF_FOUND AND NOT TARGET protobuf::libprotobuf)
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if (BUILD_protobuf)
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find_dependency(protobuf CONFIG REQUIRED)
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endif()
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endif()
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#============================================================================
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# Debug messages for find_package
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# message("pybind11_FOUND: ${pybind11_FOUND}")
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# message("pybind11_VERSION: ${pybind11_VERSION}")
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# message("pybind11_VERSION_TYPE: ${pybind11_VERSION_TYPE}")
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# message("pybind11_INCLUDE_DIRS: ${pybind11_INCLUDE_DIRS}")
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# message("pybind11_INCLUDE_DIR: ${pybind11_INCLUDE_DIR}")
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# message("pybind11_DEFINITIONS: ${pybind11_DEFINITIONS}")
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# message("pybind11_LIBRARIES: ${pybind11_LIBRARIES}")
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# message("Python_FOUND: ${Python_FOUND}")
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# message("Python_VERSION: ${Python_VERSION}")
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# message("Python_INCLUDE_DIRS: ${Python_INCLUDE_DIRS}")
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# message("Python_LIBRARIES: ${Python_LIBRARIES}")
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# message("protobuf_FOUND: ${protobuf_FOUND}")
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# message("protobuf_VERSION: ${protobuf_VERSION}")
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# message("protobuf_INCLUDE_DIRS: ${protobuf_INCLUDE_DIRS}")
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# message("protobuf_SOURCE_DIR: ${protobuf_SOURCE_DIR}")
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# message("protobuf_LIBRARIES: ${protobuf_LIBRARIES}")
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#============================================================================
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# pybind11_proto_utils pybind11 extension module
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pybind11_add_module(pybind11_proto_utils MODULE
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pybind11_protobuf/proto_utils.cc
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pybind11_protobuf/proto_utils.h
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)
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target_link_libraries(pybind11_proto_utils
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PRIVATE
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absl::strings
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protobuf::libprotobuf
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${Python_LIBRARIES}
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)
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target_include_directories(pybind11_proto_utils
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PRIVATE
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${PROJECT_SOURCE_DIR}
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${protobuf_INCLUDE_DIRS}
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${protobuf_SOURCE_DIR}
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${pybind11_INCLUDE_DIRS}
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)
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#============================================================================
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# pybind11_native_proto_caster shared library
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add_library(pybind11_native_proto_caster SHARED
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# bazel: pybind_library: native_proto_caster
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pybind11_protobuf/native_proto_caster.h
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# bazel: pybind_library: enum_type_caster
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pybind11_protobuf/enum_type_caster.h
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# bazel: pybind_library: proto_cast_util
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pybind11_protobuf/proto_cast_util.cc
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pybind11_protobuf/proto_cast_util.h
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pybind11_protobuf/proto_caster_impl.h
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# bazel: cc_library::check_unknown_fields
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pybind11_protobuf/check_unknown_fields.cc
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pybind11_protobuf/check_unknown_fields.h
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)
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target_link_libraries(pybind11_native_proto_caster
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absl::flat_hash_map
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absl::flat_hash_set
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absl::hash
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absl::strings
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absl::optional
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protobuf::libprotobuf
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pybind11::pybind11
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${Python_LIBRARIES}
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)
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target_include_directories(pybind11_native_proto_caster
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PRIVATE
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${PROJECT_SOURCE_DIR}
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${protobuf_INCLUDE_DIRS}
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${protobuf_SOURCE_DIR}
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${pybind11_INCLUDE_DIRS}
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)
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#============================================================================
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# pybind11_wrapped_proto_caster shared library
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add_library(pybind11_wrapped_proto_caster SHARED
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# bazel: pybind_library: wrapped_proto_caster
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pybind11_protobuf/wrapped_proto_caster.h
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# bazel: pybind_library: proto_cast_util
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pybind11_protobuf/proto_cast_util.cc
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pybind11_protobuf/proto_cast_util.h
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pybind11_protobuf/proto_caster_impl.h
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# bazel: cc_library: check_unknown_fields
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pybind11_protobuf/check_unknown_fields.cc
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pybind11_protobuf/check_unknown_fields.h
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)
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target_link_libraries(pybind11_wrapped_proto_caster
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absl::flat_hash_map
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absl::flat_hash_set
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absl::hash
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absl::strings
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absl::optional
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protobuf::libprotobuf
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pybind11::pybind11
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${Python_LIBRARIES}
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)
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target_include_directories(pybind11_wrapped_proto_caster
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PRIVATE
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${PROJECT_SOURCE_DIR}
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${protobuf_INCLUDE_DIRS}
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${protobuf_SOURCE_DIR}
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${pybind11_INCLUDE_DIRS}
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)
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# TODO set defines
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# PYBIND11_PROTOBUF_ENABLE_PYPROTO_API
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# see: bazel: pybind_library: proto_cast_util
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# bazel equivs. checklist
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#
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# bazel: pybind_library: enum_type_caster
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# - enum_type_caster.h
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#
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# bazel: pybind_library: native_proto_caster
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# - native_proto_caster.h
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#
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# check_unknown_fields
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# enum_type_caster
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# proto_cast_util
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#
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# bazel: pybind_library: proto_cast_util
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# - proto_cast_util.cc
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# - proto_cast_util.h
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# - proto_caster_impl.h
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#
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# check_unknown_fields
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#
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# bazel: pybind_library: wrapped_proto_caster
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# - wrapped_proto_caster.h
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#
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# proto_cast_util
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#

‎cmake/dependencies/CMakeLists.txt

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include(FetchContent)
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#============================================================================
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# Declare all dependencies first
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if(BUILD_absl)
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FetchContent_Declare(
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absl
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GIT_REPOSITORY "https://github.com/abseil/abseil-cpp.git"
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GIT_TAG "20220623.1"
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)
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endif()
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# https://stackoverflow.com/questions/63309544/cmake-protobuf-external-to-application-code
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# https://cmake.org/cmake/help/latest/policy/CMP0077.html
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# https://gitlab.kitware.com/cmake/cmake/-/merge_requests/7565/diffs
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if(BUILD_protobuf)
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set(protobuf_BUILD_TESTS OFF CACHE INTERNAL "")
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FetchContent_Declare(
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protobuf
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GIT_REPOSITORY "https://github.com/protocolbuffers/protobuf.git"
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GIT_TAG "v21.5"
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GIT_SUBMODULES ""
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)
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endif()
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if(BUILD_pybind11)
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set(PYBIND11_TEST OFF)
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FetchContent_Declare(
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pybind11
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GIT_REPOSITORY "https://github.com/pybind/pybind11.git"
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GIT_TAG "v2.10.1"
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)
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endif()
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#============================================================================
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# Make dependencies avaialble
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if(BUILD_absl)
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message(CHECK_START "Fetching Abseil-cpp")
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list(APPEND CMAKE_MESSAGE_INDENT " ")
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FetchContent_MakeAvailable(absl)
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list(POP_BACK CMAKE_MESSAGE_INDENT)
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message(CHECK_PASS "fetched")
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endif()
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if(BUILD_protobuf)
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message(CHECK_START "Fetching protobuf")
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list(APPEND CMAKE_MESSAGE_INDENT " ")
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FetchContent_MakeAvailable(protobuf)
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list(POP_BACK CMAKE_MESSAGE_INDENT)
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message(CHECK_PASS "fetched")
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endif()
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if(BUILD_pybind11)
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message(CHECK_START "Fetching pybind11")
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list(APPEND CMAKE_MESSAGE_INDENT " ")
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FetchContent_MakeAvailable(pybind11)
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list(POP_BACK CMAKE_MESSAGE_INDENT)
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message(CHECK_PASS "fetched")
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endif()
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‎cmake/deps.cmake

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if(NOT BUILD_absl)
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find_package(absl REQUIRED)
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endif()
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if(NOT BUILD_protobuf)
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find_package(protobuf REQUIRED)
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endif()
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if(NOT BUILD_pybind11)
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find_package(pybind11 REQUIRED)
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endif()
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‎pybind11_protobuf/tests/CMakeLists.txt

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#============================================================================
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# tests
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#============================================================================
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#============================================================================
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# generate protobuf bindings
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set(Protobuf_IMPORT_DIRS
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"${CMAKE_CURRENT_SOURCE_DIR}/../../..;${Protobuf_IMPORT_DIRS}"
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)
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protobuf_generate_cpp(PROTO_SRCS PROTO_HDRS
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# extension.proto
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test.proto
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)
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protobuf_generate_python(PROTO_PYS
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# extension.proto
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test.proto
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)
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#============================================================================
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# adding a custom target forces CMake to generate the bindings
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add_custom_target(pybind11_test_proto_cpp ALL DEPENDS ${PROTO_SRCS} ${PROTO_HDRS})
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add_custom_target(pybind11_test_proto_python ALL DEPENDS ${PROTO_PYS})
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#============================================================================
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# generate protobuf library
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add_library(pybind11_test_proto ${PROTO_SRCS} ${PROTO_HDR})
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target_include_directories(pybind11_test_proto
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PUBLIC
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${Protobuf_INCLUDE_DIR}
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)

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