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3rdparty: update CMake scripts for protobuf
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‎3rdparty/protobuf/CMakeLists.txt

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project(libprotobuf)
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include(CheckIncludeFiles)
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if(NOT MSVC)
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check_include_files("pthread.h" HAVE_PTHREAD)
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if(HAVE_PTHREAD)
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add_definitions(-DHAVE_PTHREAD=1)
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endif()
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endif()
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if(MSVC)
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add_definitions( -D_CRT_SECURE_NO_WARNINGS=1 )
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ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4244 /wd4267 /wd4018 /wd4355 /wd4800 /wd4251 /wd4996 /wd4146
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/wd4305 /wd4127 /wd4100 /wd4512 /wd4125 /wd4389 /wd4510 /wd4610
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/wd4702 /wd4456 /wd4457 /wd4065 /wd4310 /wd4661 /wd4506
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)
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else()
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ocv_warnings_disable(CMAKE_CXX_FLAGS -Wno-deprecated -Wmissing-prototypes -Wmissing-declarations -Wshadow
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-Wunused-parameter -Wunused-local-typedefs -Wsign-compare -Wsign-promo
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-Wundef -Wtautological-undefined-compare -Wignored-qualifiers -Wextra
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-Wunused-function -Wunused-const-variable -Wshorten-64-to-32
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)
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endif()
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if(CV_ICC)
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ocv_warnings_disable(CMAKE_CXX_FLAGS
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-wd265 -wd858 -wd873 -wd2196
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)
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endif()
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# Easier to support different versions of protobufs
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function(append_if_exist OUTPUT_LIST)
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set(${OUTPUT_LIST})
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foreach(fil ${ARGN})
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if(EXISTS ${fil})
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list(APPEND ${OUTPUT_LIST} "${fil}")
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else()
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message(WARNING "file missing: ${fil}")
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endif()
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endforeach()
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set(${OUTPUT_LIST} ${${OUTPUT_LIST}} PARENT_SCOPE)
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endfunction()
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set(PROTOBUF_ROOT "${CMAKE_CURRENT_LIST_DIR}")
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if(MSVC)
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set(ATOMICOPS_INTERNALS ${PROTOBUF_ROOT}/src/google/protobuf/stubs/atomicops_internals_x86_msvc.cc)
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else()
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set(ATOMICOPS_INTERNALS ${PROTOBUF_ROOT}/src/google/protobuf/stubs/atomicops_internals_x86_gcc.cc)
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endif()
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append_if_exist(Protobuf_SRCS
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# libprotobuf-lite
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${PROTOBUF_ROOT}/src/google/protobuf/arena.cc
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${PROTOBUF_ROOT}/src/google/protobuf/arenastring.cc
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${PROTOBUF_ROOT}/src/google/protobuf/extension_set.cc
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${PROTOBUF_ROOT}/src/google/protobuf/generated_message_util.cc
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${PROTOBUF_ROOT}/src/google/protobuf/io/coded_stream.cc
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${PROTOBUF_ROOT}/src/google/protobuf/io/zero_copy_stream.cc
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${PROTOBUF_ROOT}/src/google/protobuf/io/zero_copy_stream_impl_lite.cc
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${PROTOBUF_ROOT}/src/google/protobuf/message_lite.cc
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${PROTOBUF_ROOT}/src/google/protobuf/repeated_field.cc
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${ATOMICOPS_INTERNALS}
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${PROTOBUF_ROOT}/src/google/protobuf/stubs/bytestream.cc
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${PROTOBUF_ROOT}/src/google/protobuf/stubs/common.cc
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${PROTOBUF_ROOT}/src/google/protobuf/stubs/int128.cc
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${PROTOBUF_ROOT}/src/google/protobuf/stubs/once.cc
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${PROTOBUF_ROOT}/src/google/protobuf/stubs/status.cc
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${PROTOBUF_ROOT}/src/google/protobuf/stubs/statusor.cc
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${PROTOBUF_ROOT}/src/google/protobuf/stubs/stringpiece.cc
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${PROTOBUF_ROOT}/src/google/protobuf/stubs/stringprintf.cc
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${PROTOBUF_ROOT}/src/google/protobuf/stubs/structurally_valid.cc
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${PROTOBUF_ROOT}/src/google/protobuf/stubs/strutil.cc
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${PROTOBUF_ROOT}/src/google/protobuf/stubs/time.cc
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${PROTOBUF_ROOT}/src/google/protobuf/wire_format_lite.cc
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# libprotobuf
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${PROTOBUF_ROOT}/src/google/protobuf/any.cc
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${PROTOBUF_ROOT}/src/google/protobuf/any.pb.cc
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${PROTOBUF_ROOT}/src/google/protobuf/api.pb.cc
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# ${PROTOBUF_ROOT}/src/google/protobuf/compiler/importer.cc
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# ${PROTOBUF_ROOT}/src/google/protobuf/compiler/parser.cc
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${PROTOBUF_ROOT}/src/google/protobuf/descriptor.cc
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${PROTOBUF_ROOT}/src/google/protobuf/descriptor.pb.cc
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${PROTOBUF_ROOT}/src/google/protobuf/descriptor_database.cc
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${PROTOBUF_ROOT}/src/google/protobuf/duration.pb.cc
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${PROTOBUF_ROOT}/src/google/protobuf/dynamic_message.cc
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${PROTOBUF_ROOT}/src/google/protobuf/empty.pb.cc
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${PROTOBUF_ROOT}/src/google/protobuf/extension_set_heavy.cc
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${PROTOBUF_ROOT}/src/google/protobuf/field_mask.pb.cc
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${PROTOBUF_ROOT}/src/google/protobuf/generated_message_reflection.cc
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${PROTOBUF_ROOT}/src/google/protobuf/io/gzip_stream.cc
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${PROTOBUF_ROOT}/src/google/protobuf/io/printer.cc
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${PROTOBUF_ROOT}/src/google/protobuf/io/strtod.cc
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${PROTOBUF_ROOT}/src/google/protobuf/io/tokenizer.cc
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${PROTOBUF_ROOT}/src/google/protobuf/io/zero_copy_stream_impl.cc
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${PROTOBUF_ROOT}/src/google/protobuf/map_field.cc
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${PROTOBUF_ROOT}/src/google/protobuf/message.cc
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${PROTOBUF_ROOT}/src/google/protobuf/reflection_ops.cc
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${PROTOBUF_ROOT}/src/google/protobuf/service.cc
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${PROTOBUF_ROOT}/src/google/protobuf/source_context.pb.cc
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${PROTOBUF_ROOT}/src/google/protobuf/struct.pb.cc
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${PROTOBUF_ROOT}/src/google/protobuf/stubs/mathlimits.cc
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${PROTOBUF_ROOT}/src/google/protobuf/stubs/substitute.cc
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${PROTOBUF_ROOT}/src/google/protobuf/text_format.cc
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${PROTOBUF_ROOT}/src/google/protobuf/timestamp.pb.cc
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${PROTOBUF_ROOT}/src/google/protobuf/type.pb.cc
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${PROTOBUF_ROOT}/src/google/protobuf/unknown_field_set.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/field_comparator.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/field_mask_util.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/internal/datapiece.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/internal/default_value_objectwriter.cc
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# ${PROTOBUF_ROOT}/src/google/protobuf/util/internal/error_listener.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/internal/field_mask_utility.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/internal/json_escaping.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/internal/json_objectwriter.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/internal/json_stream_parser.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/internal/object_writer.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/internal/proto_writer.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/internal/protostream_objectsource.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/internal/protostream_objectwriter.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/internal/type_info.cc
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# ${PROTOBUF_ROOT}/src/google/protobuf/util/internal/type_info_test_helper.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/internal/utility.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/json_util.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/message_differencer.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/time_util.cc
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${PROTOBUF_ROOT}/src/google/protobuf/util/type_resolver_util.cc
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${PROTOBUF_ROOT}/src/google/protobuf/wire_format.cc
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${PROTOBUF_ROOT}/src/google/protobuf/wrappers.pb.cc
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)
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if(CMAKE_VERSION VERSION_LESS 2.8.9 AND UNIX)
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
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endif()
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add_library(libprotobuf STATIC ${Protobuf_SRCS})
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ocv_include_directories(${PROTOBUF_ROOT}/src)
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set_target_properties(libprotobuf
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PROPERTIES
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FOLDER "3rdparty"
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POSITION_INDEPENDENT_CODE 1 # CMake 2.8.9+
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OUTPUT_NAME libprotobuf
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DEBUG_POSTFIX "${OPENCV_DEBUG_POSTFIX}"
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ARCHIVE_OUTPUT_DIRECTORY ${3P_LIBRARY_OUTPUT_PATH}
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)
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if(NOT BUILD_SHARED_LIBS)
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ocv_install_target(libprotobuf EXPORT OpenCVModules ARCHIVE DESTINATION ${OPENCV_3P_LIB_INSTALL_PATH} COMPONENT dev)
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endif()

‎3rdparty/protobuf/README.md

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Project: Protocol Buffers - Google's data interchange format
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Source code: https://github.com/google/protobuf
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Version: 3.1.0

‎cmake/OpenCVFindLibProtobuf.cmake

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# By default, we use protobuf sources from 3rdparty subdirectory and pre-generated .proto files
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# Note: In case of .proto model updates these variables should be used:
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# - Protobuf_PROTOC_EXECUTABLE (required)
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# - Protobuf_INCLUDE_DIRS
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# - Protobuf_LIBRARIES or Protobuf_LIBRARY / Protobuf_LIBRARY_DEBUG for find_package()
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OCV_OPTION(BUILD_PROTOBUF "Force to build libprotobuf from sources" ON)
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OCV_OPTION(PROTOBUF_UPDATE_FILES "Force to rebuild .proto files" OFF)
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if(PROTOBUF_UPDATE_FILES)
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if(NOT DEFINED Protobuf_PROTOC_EXECUTABLE)
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find_package(Protobuf QUIET)
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endif()
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if(DEFINED Protobuf_PROTOC_EXECUTABLE AND EXISTS ${Protobuf_PROTOC_EXECUTABLE})
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message(STATUS "The protocol buffer compiler is found (${Protobuf_PROTOC_EXECUTABLE})")
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else()
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message(FATAL_ERROR "The protocol buffer compiler is not found (Protobuf_PROTOC_EXECUTABLE='${Protobuf_PROTOC_EXECUTABLE}')")
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endif()
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endif()
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if(NOT BUILD_PROTOBUF AND NOT (DEFINED Protobuf_INCLUDE_DIRS AND DEFINED Protobuf_LIBRARIES))
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find_package(Protobuf QUIET)
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endif()
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if(Protobuf_FOUND)
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# nothing
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else()
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set(Protobuf_LIBRARIES libprotobuf)
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set(Protobuf_INCLUDE_DIRS "${OpenCV_SOURCE_DIR}/3rdparty/protobuf/src")
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if(NOT TARGET ${Protobuf_LIBRARIES})
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add_subdirectory("${OpenCV_SOURCE_DIR}/3rdparty/protobuf" "${OpenCV_BINARY_DIR}/3rdparty/protobuf")
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endif()
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set(Protobuf_FOUND 1)
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endif()

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