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Friday, 26 October 2012

How to cross-compile Python for Android

Posted on 07:51 by Unknown
When it comes to cross-compiling Python for Android, I've followed Gabriel's blog post @ http://mdqinc.com/blog/2011/09/cross-compiling-python-for-android/ and I was successful in creating an Arm-based Python executable (and related libraries) in little or no time.
Gabriel has a lot of the initial steps just verbally described, but I've come up with a shell script that allows you to automate the entire process. Of course you need to replace <path-to-android-ndk> with the directory where you have installed the NDK.
Here it goes.

ANDROID_NDK=<path-to-android-ndk>
ANDROID_ABI="armeabi-v7a"
ANDROID_NATIVE_API_LEVEL="android-8"
PYTHON_VERSION="2.6.2"


output_dir=$1
mkdir -p $output_dir
cd $output_dir
# get Python source tarball
wget http://www.python.org/ftp/python/$PYTHON_VERSION/Python-$PYTHON_VERSION.tgz

# create Python Host version
tar zxvf Python-$PYTHON_VERSION.tgz
mv Python-$PYTHON_VERSION Host-Python-$PYTHON_VERSION-src
cd Host-Python-$PYTHON_VERSION-src
./configure --prefix=$output_dir/Host-Python-$PYTHON_VERSION
make
make install

cd $output_dir
# create Python Cross-compiled version for Android
tar zxvf Python-$PYTHON_VERSION.tgz
mv Python-$PYTHON_VERSION Android-Python-$PYTHON_VERSION-src
cd Android-Python-$PYTHON_VERSION-src

# get and apply Python patch
wget -o 
Python-2.6.2-android.patch https://sites.google.com/site/dgtechblogscripts/Python-2.6.2-android.patch
patch -p0 < Python-2.6.2-android.patch
# fix setup.py
mv setup.py setup.py.orig
cat setup.py.orig | awk '{ if (NR==316) {print "    " $0} else {print $0}}' > setup.py

MY_HOSTPYTHON=$output_dir/Host-Python-$PYTHON_VERSION/bin/python
MY_HOSTPGEN=$output_dir/Host-Python-$PYTHON_VERSION-src/Parser/pgen

export ANDROID_NDK
export PATH="$ANDROID_NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/:$ANDROID_NDK:$ANDROID_NDK/tools:/usr/local/bin:/usr/bin:/bin"
export ARCH=$ANDROID_ABI
export CFLAGS="-DANDROID -mandroid -fomit-frame-pointer --sysroot $ANDROID_NDK/platforms/$ANDROID_NATIVE_API_LEVEL/arch-arm"
export CXXFLAGS="$CFLAGS"
export CC="arm-linux-androideabi-gcc $CFLAGS"
export CXX="arm-linux-androideabi-g++ $CXXFLAGS"
export AR="arm-linux-androideabi-ar"
export RANLIB="arm-linux-androideabi-ranlib"
export STRIP="arm-linux-androideabi-strip --strip-unneeded"
export MAKE="make -j4 install HOSTPYTHON=$MY_HOSTPYTHON HOSTPGEN=$MY_HOSTPGEN CROSS_COMPILE=arm-eabi- CROSS_COMPILE_TARGET=yes"

./configure LDFLAGS="-Wl,--allow-shlib-undefined" CFLAGS="-mandroid -fomit-frame-pointer --sysroot $ANDROID_NDK/platforms/$ANDROID_NATIVE_API_LEVEL/arch-arm" HOSTPYTHON=$MY_HOSTPYTHON HOSTPGEN=$MY_HOSTPGEN --host=arm-eabi --build=i686-pc-linux-gnu --enable-shared --prefix="$output_dir/Android-Python-$PYTHON_VERSION"
sed -i "s|^INSTSONAME=\(.*.so\).*|INSTSONAME=\\1|g" Makefile
$MAKE

 



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