protobuf DNK下的编译

protobuffer 编译配置

mkdir -p ./cmake/build
cd ./cmake/build

cmake \
    -Dprotobuf_BUILD_SHARED_LIBS=OFF \
    -Dprotobuf_BUILD_STATIC_LIBS=ON \
    -DCMAKE_VERBOSE_MAKEFILE=ON \
    -Dprotobuf_BUILD_TEST=OFF \
    -Dprotobuf_BUILD_EXAMPLES=OFF \
    -DCMAKE_TOOLCHAIN_FILE=../toolchain.cmake \
    -DCMAKE_BUILD_TYPE=Release \
    -DANDROID_NDK=/home/floyd/ndk \
    -DANDROID_TOOLCHAIN=clang \
    -DANDROID_ABI=armeabi-v7a \
    -DANDROID_NATIVE_API_LEVEL= \
    -DANDROID_STL=c++_shared \
    -DANDROID_LINKER_FLAGS="-landroid -llog" \
    -DANDROID_CPP_FEATURES="rtti exceptions" \
    ..

如果编译出现错误 “undefined reference to `__android_log_write'”，编辑代码手动选择DefaultLogHandler的实现

./toolchain.cmake内容

SET(CMAKE_SYSTEM_NAME Linux)
SET(CMAKE_SYSTEM_VERSION )

set(CMAKE_C_COMPILER arm-linux-androideabi-gcc)

#set(CMAKE_FIND_ROOT_PATH /root/NanoPi2/linux-3.4.y/usr/include)

SET(CMAKE_FIND_ROOT_PATH ${SDK_SYS_ROOT_PATH})
SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

protobuf-c编译
将libprotobuf.a libprotobuf-lite.a libprotobuf-c.a拷贝到工具链的目录/home/floyd/ndk/lib

protobuf-c编译配置

./configure CC=arm-linux-androideabi-gcc CXX=arm-linux-androideabi-g++ --host=arm-linux protobuf_LIBS="-L//home/floyd/ndk/lib -lprotobuf"

检查Makefile

protoc_c_protoc_gen_c_LDADD = \
    $(protobuf_LIBS) \
    -lprotoc

更改为（依赖顺序protoc protobuf_LIBS）：

protoc_c_protoc_gen_c_LDADD = \
    -lprotoc \
    $(protobuf_LIBS)

make

基于protobufc的应用程序

只需要连接“-lprotobuf-lite -lprotobuf-c”