如何通过Android NDK构建协议缓冲区

Question

我想构建 Google 协议缓冲区库的本机版本。
我该怎么做呢？

Answer 1

我使用这个 Android.mk 并成功构建

    # Copyright (C) 2009 The Android Open Source Project
    #
    # Licensed under the Apache License, Version 2.0 (the "License");
    # you may not use this file except in compliance with the License.
    # You may obtain a copy of the License at
    #
    #      http://www.apache.org/licenses/LICENSE-2.0
    #
    # Unless required by applicable law or agreed to in writing, software
    # distributed under the License is distributed on an "AS IS" BASIS,
    # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    # See the License for the specific language governing permissions and
    # limitations under the License.
    #
    #

    LOCAL_PATH := $(call my-dir)
    include $(CLEAR_VARS)
    CC_LITE_SRC_FILES := \
        src/google/protobuf/stubs/common.cc                              \
        src/google/protobuf/stubs/once.cc                                \
        src/google/protobuf/stubs/hash.cc                                \
        src/google/protobuf/extension_set.cc                             \
        src/google/protobuf/generated_message_util.cc                    \
        src/google/protobuf/message_lite.cc                              \
        src/google/protobuf/repeated_field.cc                            \
        src/google/protobuf/wire_format_lite.cc                          \
        src/google/protobuf/io/coded_stream.cc                           \
        src/google/protobuf/io/zero_copy_stream.cc                       \
        src/google/protobuf/io/zero_copy_stream_impl_lite.cc


    COMPILER_SRC_FILES :=  \
        src/google/protobuf/descriptor.cc \
        src/google/protobuf/descriptor.pb.cc \
        src/google/protobuf/descriptor_database.cc \
        src/google/protobuf/dynamic_message.cc \
        src/google/protobuf/extension_set.cc \
        src/google/protobuf/extension_set_heavy.cc \
        src/google/protobuf/generated_message_reflection.cc \
        src/google/protobuf/generated_message_util.cc \
        src/google/protobuf/message.cc \
        src/google/protobuf/message_lite.cc \
        src/google/protobuf/reflection_ops.cc \
        src/google/protobuf/repeated_field.cc \
        src/google/protobuf/service.cc \
        src/google/protobuf/text_format.cc \
        src/google/protobuf/unknown_field_set.cc \
        src/google/protobuf/wire_format.cc \
        src/google/protobuf/wire_format_lite.cc \
        src/google/protobuf/compiler/code_generator.cc \
        src/google/protobuf/compiler/command_line_interface.cc \
        src/google/protobuf/compiler/importer.cc \
        src/google/protobuf/compiler/main.cc \
        src/google/protobuf/compiler/parser.cc \
        src/google/protobuf/compiler/plugin.cc \
        src/google/protobuf/compiler/plugin.pb.cc \
        src/google/protobuf/compiler/subprocess.cc \
        src/google/protobuf/compiler/zip_writer.cc \
        src/google/protobuf/compiler/cpp/cpp_enum.cc \
        src/google/protobuf/compiler/cpp/cpp_enum_field.cc \
        src/google/protobuf/compiler/cpp/cpp_extension.cc \
        src/google/protobuf/compiler/cpp/cpp_field.cc \
        src/google/protobuf/compiler/cpp/cpp_file.cc \
        src/google/protobuf/compiler/cpp/cpp_generator.cc \
        src/google/protobuf/compiler/cpp/cpp_helpers.cc \
        src/google/protobuf/compiler/cpp/cpp_message.cc \
        src/google/protobuf/compiler/cpp/cpp_message_field.cc \
        src/google/protobuf/compiler/cpp/cpp_primitive_field.cc \
        src/google/protobuf/compiler/cpp/cpp_service.cc \
        src/google/protobuf/compiler/cpp/cpp_string_field.cc \
        src/google/protobuf/compiler/java/java_enum.cc \
        src/google/protobuf/compiler/java/java_enum_field.cc \
        src/google/protobuf/compiler/java/java_extension.cc \
        src/google/protobuf/compiler/java/java_field.cc \
        src/google/protobuf/compiler/java/java_file.cc \
        src/google/protobuf/compiler/java/java_generator.cc \
        src/google/protobuf/compiler/java/java_helpers.cc \
        src/google/protobuf/compiler/java/java_message.cc \
        src/google/protobuf/compiler/java/java_message_field.cc \
        src/google/protobuf/compiler/java/java_primitive_field.cc \
        src/google/protobuf/compiler/java/java_service.cc \
        src/google/protobuf/compiler/javamicro/javamicro_enum.cc \
        src/google/protobuf/compiler/javamicro/javamicro_enum_field.cc \
        src/google/protobuf/compiler/javamicro/javamicro_field.cc \
        src/google/protobuf/compiler/javamicro/javamicro_file.cc \
        src/google/protobuf/compiler/javamicro/javamicro_generator.cc \
        src/google/protobuf/compiler/javamicro/javamicro_helpers.cc \
        src/google/protobuf/compiler/javamicro/javamicro_message.cc \
        src/google/protobuf/compiler/javamicro/javamicro_message_field.cc \
        src/google/protobuf/compiler/javamicro/javamicro_primitive_field.cc \
        src/google/protobuf/compiler/python/python_generator.cc \
        src/google/protobuf/io/coded_stream.cc \
        src/google/protobuf/io/gzip_stream.cc \
        src/google/protobuf/io/printer.cc \
        src/google/protobuf/io/tokenizer.cc \
        src/google/protobuf/io/zero_copy_stream.cc \
        src/google/protobuf/io/zero_copy_stream_impl.cc \
        src/google/protobuf/io/zero_copy_stream_impl_lite.cc \
        src/google/protobuf/stubs/common.cc \
        src/google/protobuf/stubs/hash.cc \
        src/google/protobuf/stubs/once.cc \
        src/google/protobuf/stubs/structurally_valid.cc \
        src/google/protobuf/stubs/strutil.cc \
        src/google/protobuf/stubs/substitute.cc

    # C++ full library
    # =======================================================
    #include $(CLEAR_VARS)

    LOCAL_MODULE := libprotobuf
    LOCAL_MODULE_TAGS := optional

    LOCAL_CPP_EXTENSION := .cc

    LOCAL_SRC_FILES := \
        $(CC_LITE_SRC_FILES)                                             \
        src/google/protobuf/stubs/strutil.cc                             \
        src/google/protobuf/stubs/substitute.cc                          \
        src/google/protobuf/stubs/structurally_valid.cc                  \
        src/google/protobuf/descriptor.cc                                \
        src/google/protobuf/descriptor.pb.cc                             \
        src/google/protobuf/descriptor_database.cc                       \
        src/google/protobuf/dynamic_message.cc                           \
        src/google/protobuf/extension_set_heavy.cc                       \
        src/google/protobuf/generated_message_reflection.cc              \
        src/google/protobuf/message.cc                                   \
        src/google/protobuf/reflection_ops.cc                            \
        src/google/protobuf/service.cc                                   \
        src/google/protobuf/text_format.cc                               \
        src/google/protobuf/unknown_field_set.cc                         \
        src/google/protobuf/wire_format.cc                               \
        src/google/protobuf/io/gzip_stream.cc                            \
        src/google/protobuf/io/printer.cc                                \
        src/google/protobuf/io/tokenizer.cc                              \
        src/google/protobuf/io/zero_copy_stream_impl.cc                  \
        src/google/protobuf/compiler/importer.cc                         \
        src/google/protobuf/compiler/parser.cc

    LOCAL_C_INCLUDES := \
        $(LOCAL_PATH)/src

    LOCAL_C_INCLUDES := \
        $(LOCAL_PATH)/android \
        bionic \
        $(LOCAL_PATH)/src \
        $(JNI_H_INCLUDE)

    LOCAL_SHARED_LIBRARIES := \
        libz libcutils libutils
    LOCAL_LDLIBS := -lz
    # stlport conflicts with the host stl library
    ifneq ($(TARGET_SIMULATOR),true)
    LOCAL_C_INCLUDES += external/stlport/stlport
    LOCAL_SHARED_LIBRARIES += libstlport
    endif

    # Define the header files to be copied
    #LOCAL_COPY_HEADERS := \
    #    src/google/protobuf/stubs/once.h \
    #    src/google/protobuf/stubs/common.h \
    #    src/google/protobuf/io/coded_stream.h \
    #    src/google/protobuf/generated_message_util.h \
    #    src/google/protobuf/repeated_field.h \
    #    src/google/protobuf/extension_set.h \
    #    src/google/protobuf/wire_format_lite_inl.h
    #
    #LOCAL_COPY_HEADERS_TO := $(LOCAL_MODULE)

    LOCAL_CFLAGS := -DGOOGLE_PROTOBUF_NO_RTTI

    include $(BUILD_SHARED_LIBRARY)

Answer 2

上面提到的 Android.mk 工作正常，非常感谢。

我想描述一下为 android 构建 protobuf 的所有步骤。

• 配置 Android 源。
  使用以下脚本（在这里获取：http://habrahabr.ru/post/119693/） ：

  PREBUILT=/Users/user/android-ndk-r7b/toolchains/arm-linux-androideabi-4.4.3

  PLATFORM=/Users/user/android-ndk-r7b/platforms/android-3/arch-arm/

  导出 CC="/Users/user/android-ndk-r7b/toolchains/arm-linux-androideabi-4.4.3/prebuilt/darwin-x86/bin/arm-linux-androideabi-gcc"

  导出 CFLAGS="-fPIC -DANDROID -nostdlib"

  导出 ANDROID_ROOT="/Users/user/android-ndk-r7b"

  export LDFLAGS="-Wl,-rpath-link=$ANDROID_ROOT/platforms/android-3/arch-arm/usr/lib/ -L$ANDROID_ROOT/platforms/android-3/arch-arm/usr/lib /”

  导出 CPPFLAGS="-I$ANDROID_ROOT/platforms/android-3/arch-arm/usr/include/"

  导出 LIBS="-lc"

  ./configure --host=arm-eabi

• 从上面删除以下行Android.mk文件：

  src/google/protobuf/stubs/strutil.cc \
  src/google/protobuf/stubs/substitute.cc \
  src/google/protobuf/stubs/structurally_valid.cc \
  src/google/protobuf/descriptor.cc \
  src/google/protobuf/descriptor.pb.cc \
  src/google/protobuf/descriptor_database.cc \
  src/google/protobuf/dynamic_message.cc \
  src/google/protobuf/extension_set_heavy.cc \
  src/google/protobuf/ generated_message_reflection.cc \
  src/google/protobuf/message.cc \
  src/google/protobuf/reflection_ops.cc \
  src/google/protobuf/service.cc \
  src/google/protobuf/text_format.cc \
  src/google/protobuf/unknown_field_set.cc \
  src/google/protobuf/wire_format.cc \
  src/google/protobuf/io/gzip_stream.cc \
  src/google/protobuf/io/printer.cc \
  src/google/protobuf/io/tokenizer.cc \
  src/google/protobuf/io/zero_copy_stream_impl.cc \
  src/google/protobuf/compiler/importer.cc \
  src/google/protobuf/compiler/parser.cc
  

  构建精简版库需要它。
  不幸的是，该库的完整版本仅适用于 Android 2.3。
  我测试了 Android 1.6、2.1、2.3 的精简版。

• 使用 ndk-build 构建库。
• 为了为 lite 库生成 c++ 文件（使用 protoc 编译器），需要包括： option optimize_for = LITE_RUNTIME;在 .proto 文件中。