Protocol Buffers Android build script

build_protobuf.sh

#!/bin/bash

#fail fast
set -e

OUTPUT=`pwd`
TEMP=$(mktemp -d /tmp/build_protobuf.XXXXXX)
TOOLCHAIN_PATH=$TEMP/toolchain
ARCH=arm
TOOLCHAIN=arm-linux-androideabi-clang
HOST_TRIPLET=arm-linux-androideabi
#ARCH=x86
#TOOLCHAIN=x86-clang
#HOST_TRIPLET=x86-linux-android
PLATFORM_VERSION=android-19
PROTOBUF_VER=2.6.1
NATIVE_PROTOC=protoc #assumes its available via path

WARNING_SUPRESSIONS="-Wno-unused-const-variable \
                     -Wno-unused-local-typedef \
                     -Wno-unused-function"

export PATH=$TOOLCHAIN_PATH/bin:$PATH
export SYSROOT=$TOOLCHAIN_PATH/sysroot
export CC=$TOOLCHAIN_PATH/bin/clang
export CXX=$TOOLCHAIN_PATH/bin/clang++

case "$ARCH" in
    arm)
        CFLAGS="$CFLAGS -march=armv7-a -mfloat-abi=softfp -mfpu=neon"
        CXXFLAGS="$CXXFLAGS -march=armv7-a -mfloat-abi=softfp -mfpu=neon"
        export LDFLAGS="-march=armv7-a -Wl,--fix-cortex-a8"
    ;;
    x86)
    # x86 flags
    ;;
esac

export CFLAGS="$CFLAGS $(echo $WARNING_SUPRESSIONS | xargs)"
export CXXFLAGS="$CXXFLAGS $(echo $WARNING_SUPRESSIONS | xargs)"

if [ -d $TOOLCHAIN_PATH ]; then
    echo "Deleting prior toolchain"
    rm -r $TOOLCHAIN_PATH
fi

echo "CFLAGS = $CFLAGS"
echo "CXXFLAGS = $CXXFLAGS"
echo "LDFLAGS = $LDFLAGS"

echo "Creating standalone android toolchain in $TOOLCHAIN_PATH"

TOOLCHAIN_BUILD=$NDK_ROOT/build/tools/make-standalone-toolchain.sh
$TOOLCHAIN_BUILD --toolchain=$TOOLCHAIN \
                 --arch=$ARCH \
                 --platform=$PLATFORM_VERSION \
                 --install-dir=$TOOLCHAIN_PATH

echo "Downloading protobuf $PROTOBUF_VER source from github"
curl -L -f \
     --output $TEMP/protobuf-$PROTOBUF_VER.tar.gz \
     "https://github.com/google/protobuf/releases/download/v$PROTOBUF_VER/protobuf-$PROTOBUF_VER.tar.gz"

if [ -d $TEMP/protobuf-$PROTOBUF_VER ]; then
    echo "Deleting existing protobuf work path"
    rm -rf $TEMP/protobuf-$PROTOBUF_VER
fi

cd $TEMP

echo "Untarring protobuf"
tar xvf $TEMP/protobuf-$PROTOBUF_VER.tar.gz

cd $TEMP/protobuf-$PROTOBUF_VER/

mkdir install

echo "Autotools configuration"

./configure --prefix=$(pwd)/install \
            --with-sysroot=$SYSROOT \
            --host=$HOST_TRIPLET \
            --disable-shared \
            --enable-cross-compile \
            --with-protoc=$NATIVE_PROTOC > /dev/null

echo "Compiling"

make > /dev/null && make install > /dev/null

`find $TOOLCHAIN_PATH/bin/ -name "*readelf"` -A install/lib/libprotobuf-lite.a | tail -n 20

echo "Compilation successful"
echo "Copying libs to lib/"

if [ ! -d $OUTPUT/lib ]; then
    mkdir $OUTPUT/lib
fi

cp install/lib/libprotobuf.a $OUTPUT/lib/libprotobuf.a
cp install/lib/libprotobuf-lite.a $OUTPUT/lib/libprotobuf-lite.a
cp install/lib/libprotoc.a $OUTPUT/lib/libprotoc.a

echo "Copying headers to include/"

if [ ! -d $OUTPUT/include ]; then
    mkdir $OUTPUT/include
fi

cp -R install/include $OUTPUT/

echo "Copying binaries (protoc) to bin/"

if [ ! -d $OUTPUT/bin ]; then
    mkdir $OUTPUT/bin
fi

cp install/bin/protoc $OUTPUT/bin/protoc

rm -r $TEMP