Build ICU for Android

icu-build-android.md

Build ICU for Android

Prepare cross build environment

cd icu && mkdir linux && cd linux

../source/runConfigureICU Linux --prefix=$PWD/prebuilts \
    CFLAGS="-Os"
    CXXFLAGS="--std=c++11" \
    --enable-static \
    --enable-shared=no \
    --enable-extras=no \
    --enable-strict=no \
    --enable-icuio=no \
    --enable-layout=no \
    --enable-layoutex=no \
    --enable-tools=no \
    --enable-tests=no \
    --enable-samples=no \
    --enable-dyload=no

make -j5

---

Prepare build environment for each build

export CROSS_BUILD_DIR=$(realpath ../linux)

export ANDROID_NDK=/usr/local/opt/android-ndk

export ANDROID_TOOLCHAIN=$(pwd)/toolchain

export PATH=$ANDROID_TOOLCHAIN/bin:$PATH

---

Make standalone toolchain and build armv7a library

cd ../ && mkdir armv7a && cd armv7a

$ANDROID_NDK/build/tools/make-standalone-toolchain.sh \
    --platform=android-15 \
    --install-dir=$ANDROID_TOOLCHAIN \
    --toolchain=arm-linux-androideabi-4.9 \
    --llvm-version=3.6

../source/configure --prefix=$(pwd)/prebuilt \
    --host=arm-linux-androideabi \
    --enable-static \
    --enable-shared=no \
    --enable-extras=no \
    --enable-strict=no \
    --enable-icuio=no \
    --enable-layout=no \
    --enable-layoutex=no \
    --enable-tools=no \
    --enable-tests=no \
    --enable-samples=no \
    --enable-dyload=no \
    -with-cross-build=$CROSS_BUILD_DIR \
    CFLAGS='-Os -march=armv7-a -mfloat-abi=softfp -mfpu=neon' \
    CXXFLAGS='--std=c++11 -march=armv7-a -mfloat-abi=softfp -mfpu=neon' \
    LDFLAGS='-march=armv7-a -Wl,--fix-cortex-a8' \
    CC=arm-linux-androideabi-clang \
    CXX=arm-linux-androideabi-clang++ \
    AR=arm-linux-androideabi-ar \
    RINLIB=arm-linux-androideabi-ranlib \
    --with-data-packaging=archive

make -j5 && make install

---

Make standalone toolchain and build x86 library

cd ../ && mkdir x86 && cd x86

$ANDROID_NDK/build/tools/make-standalone-toolchain.sh \
    --platform=android-15 \
    --install-dir=$ANDROID_TOOLCHAIN \
    --toolchain=x86-4.9 \
    --llvm-version=3.6

../source/configure --prefix=$(pwd)/prebuilt \
    --host=i686-linux-android \
    --enable-static \
    --enable-shared=no \
    --enable-extras=no \
    --enable-strict=no \
    --enable-icuio=no \
    --enable-layout=no \
    --enable-layoutex=no \
    --enable-tools=no \
    --enable-tests=no \
    --enable-samples=no \
    --enable-dyload=no \
    -with-cross-build=$CROSS_BUILD_DIR \
    CFLAGS='-Os -march=i686 -mtune=intel -mssse3 -mfpmath=sse -m32' \
    CXXFLAGS='--std=c++11 -march=i686 -mtune=intel -mssse3 -mfpmath=sse -m32' \
    CC=i686-linux-android-clang \
    CXX=i686-linux-android-clang++ \
    AR=i686-linux-android-ar \
    RINLIB=i686-linux-android-ranlib \
    --with-data-packaging=archive

make -j5 && make install

---

Make standalone toolchain and build aarch64 library

cd ../ && mkdir aarch64 && cd aarch64

$ANDROID_NDK/build/tools/make-standalone-toolchain.sh \
    --platform=android-21 \
    --install-dir=$ANDROID_TOOLCHAIN \
    --toolchain=aarch64-linux-android-clang3.6

../source/configure --prefix=$(pwd)/prebuilt \
    --host=aarch64-linux-android \
    --enable-static \
    --enable-shared=no \
    --enable-extras=no \
    --enable-strict=no \
    --enable-icuio=no \
    --enable-layout=no \
    --enable-layoutex=no \
    --enable-tools=no \
    --enable-tests=no \
    --enable-samples=no \
    --enable-dyload=no \
    -with-cross-build=$CROSS_BUILD_DIR \
    CFLAGS='-Os' \
    CXXFLAGS='--std=c++11' \
    CC=aarch64-linux-android-clang \
    CXX=aarch64-linux-android-clang++ \
    AR=aarch64-linux-android-ar \
    RINLIB=aarch64-linux-android-ranlib \
    --with-data-packaging=archive

make -j5 && make install

Thanks for this script. Could you mention the ICU library URL and version that worked with this script?

No doubt you were able to compile it, but it seems there are some mistakes left:

1. RINLIB=i686-linux-android-ranlib -> RANLIB=i686-linux-android-ranlib
2. -with-cross-build -> --with-cross-build

In the preparation with runConfigureICU also the prefix is "--prefix=$PWD/prebuilts", while in the actual configure it's
"--prefix=$PWD/prebuilt" without final "s". It is intended? How the configure will actually use the prebuilts?

Does anyone know how to build libicudata part of this library? This script doesn't build it. Just short version of it.

@DanielSerdyukov @silvioprog @ceztko @alexandrkirilov can anyone please help for x86_64 ABI. I tried with similar script for x86_64, but I am getting incompatible target error. Seems like I am messing some flags. I used x86 script and changed

1. march=i686-> x86_64
2. -m32-> -m64