Building protobuff libs for Android 64 bit (ARM64-v8a) Qt 5.12.4
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Build Instructions on Ubuntu 16.04 LTS
Building Android Tool Chain :
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Few Dependencies :
sudo apt-get install autoconf automake libtool curl make g++ unzip python gcc git -
Download NDK - Latest Stable Version ( I used NDK r20b, which was latest during i built it )
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You may want to append export NDK=$HOME/<path-to-NDK> to your
~/.bashrc
echo $NDKto verify NDK path from above. -
Creating the Standalone toolchain.
The NDK folder contains default toolchains, or we can build it - Standalone Toolchains (Obsolete)
Example
$NDK/build/tools/make_standalone_toolchain.py \ --arch arm64 \ --api 28 \ --stl=libc++ \ --install-dir=$HOME/<path-to-build-dir>- You may want to append export PATH=$HOME/<path-to-build-dir/bin:$PATH to your
~/.bashrc
echo $PATHto verify toolchain path.
Building Google’s Protobuf library :
- Clone protobuf
mkdir $HOME/Android/NDK/google cd $HOME/Android/NDK/google git clone https://github.com/protocolbuffers/protobuf.git cd protobuf git submodule update --init --recursive # Checkout if specific version is needed, example as shown below, else ignore the below command git checkout -b v3.5.2 v3.5.2- Build a native (x86) version of the protobuf libraries and compiler (
protoc)
sudo apt-get install curl autoconf libtool build-essential g++
In protobuf folder
./autogen.sh mkdir x86_build cd x86_build # x86_pb_install folder should be created manually at below given path then run the below cmd ../configure --prefix=$HOME/Android/NDK/google/x86_pb_install make install –j4 cd ..Libraries will been installed in:
$HOME/Android/NDK/google/x86_pb_install/lib
protocwill be in:$HOME/Android/NDK/google/x86_pb_install/bin
include files will be in:$HOME/Android/NDK/google/x86_pb_install/include- Build the
arm64version of the protobuf libraries:
mkdir arm64_build cd arm64_build # arm64_pb_install folder should be created manually at below given path then run the below cmd CC=aarch64-linux-android-clang \ CXX=aarch64-linux-android-clang++ \ CFLAGS="-fPIE -fPIC" LDFLAGS="-pie -llog" \ ../configure --host=aarch64-linux-android \ --prefix=$HOME/Android/NDK/google/arm64_pb_install \ --with-protoc=$HOME/Android/NDK/google/x86_pb_install/bin/protoc make install –j4 cd ..Libraries will been installed in:
$HOME/Android/NDK/google/arm64_pb_install/lib
protoc will be in:$HOME/Android/NDK/google/arm64_pb_install/bin
include files will be in:$HOME/Android/NDK/google/arm64_pb_install/include- Compiling Your Protocol Buffers
protoc -I=$SRC_DIR --cpp_out=$DST_DIR $SRC_DIR/file_name.proto
@SGaist
Hope this helps@Chapay, @Clem3nt
If possible please try this and update me.Thanks for this.
It's working fine.
Little remark from Nov 2020, the scriptmake_standalone_toolchain.pyis no longer needed:#$ $NDK/build/tools/make_standalone_toolchain.py --arch arm64 --api 28 --stl=libc++ --install-dir=/home/bruel/apps/protobuf/build #WARNING:__main__:make_standalone_toolchain.py is no longer necessary. The #$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin directory contains target-specific scripts that perform #the same task. For example, instead of: # # $ python $NDK/build/tools/make_standalone_toolchain.py \ # --arch arm64 --api 28 --install-dir toolchain # $ toolchain/bin/clang++ src.cpp # #Instead use: # # $ $NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android28-clang++ src.cppSo for arm64, you can go directly like this
CC=$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android$ANDROID_API-clang CXX=$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android$ANDROID_API-clang++ CFLAGS="-fPIE -fPIC" LDFLAGS="-pie -llog" ../configure --host=aarch64-linux-android --prefix=$APPS_DIR/protobuf/release/arm64 --with-protoc=~/apps/protobuf/release/x86_64/bin/protocFor those interested, here is my script to build on Linux for x86_64, arm64 and armv7a.
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Thanks for this.
It's working fine.
Little remark from Nov 2020, the scriptmake_standalone_toolchain.pyis no longer needed:#$ $NDK/build/tools/make_standalone_toolchain.py --arch arm64 --api 28 --stl=libc++ --install-dir=/home/bruel/apps/protobuf/build #WARNING:__main__:make_standalone_toolchain.py is no longer necessary. The #$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin directory contains target-specific scripts that perform #the same task. For example, instead of: # # $ python $NDK/build/tools/make_standalone_toolchain.py \ # --arch arm64 --api 28 --install-dir toolchain # $ toolchain/bin/clang++ src.cpp # #Instead use: # # $ $NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android28-clang++ src.cppSo for arm64, you can go directly like this
CC=$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android$ANDROID_API-clang CXX=$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android$ANDROID_API-clang++ CFLAGS="-fPIE -fPIC" LDFLAGS="-pie -llog" ../configure --host=aarch64-linux-android --prefix=$APPS_DIR/protobuf/release/arm64 --with-protoc=~/apps/protobuf/release/x86_64/bin/protocFor those interested, here is my script to build on Linux for x86_64, arm64 and armv7a.
Hi @mbruel
That's cool,
I had a critical time & had to go withmake_standalone_toolchain.pyat that time.Thanks for the updated script on this Building protobuff libs for Android 64 bit (ARM64-v8a) Qt 5.12.4.
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In fact with the method I've posted just above, I can build the Android arm64 library but when I deploy it to a device it's crashing with this:
E AndroidRuntime: FATAL EXCEPTION: qtMainLoopThread E AndroidRuntime: Process: fr.mbruel.ClementineRemote, PID: 24487 E AndroidRuntime: java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "_Unwind_Resume" referenced by "/data/app/fr.mbruel.ClementineRemote-eCT926MVQi5HkO3nFNVzEg==/lib/arm64/libprotobuf.so"... E AndroidRuntime: at java.lang.Runtime.load0(Runtime.java:938) E AndroidRuntime: at java.lang.System.load(System.java:1631) E AndroidRuntime: at org.qtproject.qt5.android.QtNative$3.run(QtNative.java:348) E AndroidRuntime: at org.qtproject.qt5.android.QtThread$2.run(QtThread.java:87) E AndroidRuntime: at org.qtproject.qt5.android.QtThread$1.run(QtThread.java:61) E AndroidRuntime: at java.lang.Thread.run(Thread.java:919)Any idea why?
I'm using protobuf 3.13. I've tried the latest 3.17 but I've the same issue...
I'm building using this command:NDK=~/android/android-ndk-r21 ANDROID_API=29 CC=$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android$ANDROID_API-clang CXX=$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android$ANDROID_API-clang++ CFLAGS="-fPIE -fPIC" LDFLAGS="-pie -llog" ../configure --host=aarch64-linux-android --prefix=~/apps/protobuf/release/arm64 --with-protoc=~/apps/protobuf/release/x86_64/bin/protoc
