mirror of https://github.com/python/cpython
gh-71052: Add Android build script and instructions (#116426)
This commit is contained in:
Malcolm Smith
GitHub
parent
50f9b0b1e0
commit
3ec57307e7
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# Python for Android
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These instructions are only needed if you're planning to compile Python for
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Android yourself. Most users should *not* need to do this. If you're looking to
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use Python on Android, one of the following tools will provide a much more
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approachable user experience:
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* [Briefcase](https://briefcase.readthedocs.io), from the BeeWare project
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* [Buildozer](https://buildozer.readthedocs.io), from the Kivy project
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* [Chaquopy](https://chaquo.com/chaquopy/)
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## Prerequisites
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Export the `ANDROID_HOME` environment variable to point at your Android SDK. If
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you don't already have the SDK, here's how to install it:
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* Download the "Command line tools" from <https://developer.android.com/studio>.
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* Create a directory `android-sdk/cmdline-tools`, and unzip the command line
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tools package into it.
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* Rename `android-sdk/cmdline-tools/cmdline-tools` to
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`android-sdk/cmdline-tools/latest`.
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* `export ANDROID_HOME=/path/to/android-sdk`
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## Building
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Building for Android requires doing a cross-build where you have a "build"
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Python to help produce an Android build of CPython. This procedure has been
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tested on Linux and macOS.
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The easiest way to do a build is to use the `android.py` script. You can either
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have it perform the entire build process from start to finish in one step, or
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you can do it in discrete steps that mirror running `configure` and `make` for
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each of the two builds of Python you end up producing.
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The discrete steps for building via `android.py` are:
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```sh
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./android.py configure-build
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./android.py make-build
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./android.py configure-host HOST
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./android.py make-host HOST
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```
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To see the possible values of HOST, run `./android.py configure-host --help`.
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Or to do it all in a single command, run:
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```sh
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./android.py build HOST
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```
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In the end you should have a build Python in `cross-build/build`, and an Android
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build in `cross-build/HOST`.
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You can use `--` as a separator for any of the `configure`-related commands –
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including `build` itself – to pass arguments to the underlying `configure`
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call. For example, if you want a pydebug build that also caches the results from
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`configure`, you can do:
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```sh
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./android.py build HOST -- -C --with-pydebug
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```
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@ -0,0 +1,87 @@
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# This script must be sourced with the following variables already set:
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: ${ANDROID_HOME:?} # Path to Android SDK
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: ${HOST:?} # GNU target triplet
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# You may also override the following:
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: ${api_level:=21} # Minimum Android API level the build will run on
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: ${PREFIX:-} # Path in which to find required libraries
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# Print all messages on stderr so they're visible when running within build-wheel.
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log() {
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echo "$1" >&2
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}
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fail() {
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log "$1"
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exit 1
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}
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# When moving to a new version of the NDK, carefully review the following:
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#
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# * https://developer.android.com/ndk/downloads/revision_history
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#
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# * https://android.googlesource.com/platform/ndk/+/ndk-rXX-release/docs/BuildSystemMaintainers.md
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# where XX is the NDK version. Do a diff against the version you're upgrading from, e.g.:
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# https://android.googlesource.com/platform/ndk/+/ndk-r25-release..ndk-r26-release/docs/BuildSystemMaintainers.md
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ndk_version=26.2.11394342
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ndk=$ANDROID_HOME/ndk/$ndk_version
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if ! [ -e $ndk ]; then
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log "Installing NDK: this may take several minutes"
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yes | $ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager "ndk;$ndk_version"
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fi
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if [ $HOST = "arm-linux-androideabi" ]; then
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clang_triplet=armv7a-linux-androideabi
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else
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clang_triplet=$HOST
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fi
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# These variables are based on BuildSystemMaintainers.md above, and
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# $ndk/build/cmake/android.toolchain.cmake.
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toolchain=$(echo $ndk/toolchains/llvm/prebuilt/*)
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export AR="$toolchain/bin/llvm-ar"
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export AS="$toolchain/bin/llvm-as"
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export CC="$toolchain/bin/${clang_triplet}${api_level}-clang"
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export CXX="${CC}++"
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export LD="$toolchain/bin/ld"
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export NM="$toolchain/bin/llvm-nm"
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export RANLIB="$toolchain/bin/llvm-ranlib"
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export READELF="$toolchain/bin/llvm-readelf"
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export STRIP="$toolchain/bin/llvm-strip"
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# The quotes make sure the wildcard in the `toolchain` assignment has been expanded.
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for path in "$AR" "$AS" "$CC" "$CXX" "$LD" "$NM" "$RANLIB" "$READELF" "$STRIP"; do
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if ! [ -e "$path" ]; then
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fail "$path does not exist"
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fi
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done
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export CFLAGS=""
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export LDFLAGS="-Wl,--build-id=sha1 -Wl,--no-rosegment"
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# Many packages get away with omitting -lm on Linux, but Android is stricter.
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LDFLAGS="$LDFLAGS -lm"
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# -mstackrealign is included where necessary in the clang launcher scripts which are
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# pointed to by $CC, so we don't need to include it here.
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if [ $HOST = "arm-linux-androideabi" ]; then
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CFLAGS="$CFLAGS -march=armv7-a -mthumb"
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fi
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if [ -n "${PREFIX:-}" ]; then
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abs_prefix=$(realpath $PREFIX)
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CFLAGS="$CFLAGS -I$abs_prefix/include"
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LDFLAGS="$LDFLAGS -L$abs_prefix/lib"
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export PKG_CONFIG="pkg-config --define-prefix"
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export PKG_CONFIG_LIBDIR="$abs_prefix/lib/pkgconfig"
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fi
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# Use the same variable name as conda-build
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if [ $(uname) = "Darwin" ]; then
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export CPU_COUNT=$(sysctl -n hw.ncpu)
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else
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export CPU_COUNT=$(nproc)
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fi
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@ -0,0 +1,202 @@
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#!/usr/bin/env python3
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import argparse
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import os
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import re
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import shutil
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import subprocess
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import sys
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import sysconfig
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from os.path import relpath
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from pathlib import Path
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SCRIPT_NAME = Path(__file__).name
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CHECKOUT = Path(__file__).resolve().parent.parent
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CROSS_BUILD_DIR = CHECKOUT / "cross-build"
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def delete_if_exists(path):
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if path.exists():
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print(f"Deleting {path} ...")
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shutil.rmtree(path)
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def subdir(name, *, clean=None):
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path = CROSS_BUILD_DIR / name
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if clean:
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delete_if_exists(path)
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if not path.exists():
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if clean is None:
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sys.exit(
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f"{path} does not exist. Create it by running the appropriate "
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f"`configure` subcommand of {SCRIPT_NAME}.")
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else:
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path.mkdir(parents=True)
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return path
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def run(command, *, host=None, **kwargs):
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env = os.environ.copy()
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if host:
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env_script = CHECKOUT / "Android/android-env.sh"
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env_output = subprocess.run(
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f"set -eu; "
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f"HOST={host}; "
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f"PREFIX={subdir(host)}/prefix; "
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f". {env_script}; "
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f"export",
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check=True, shell=True, text=True, stdout=subprocess.PIPE
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).stdout
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for line in env_output.splitlines():
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# We don't require every line to match, as there may be some other
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# output from installing the NDK.
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if match := re.search(
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"^(declare -x |export )?(\\w+)=['\"]?(.*?)['\"]?$", line
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):
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key, value = match[2], match[3]
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if env.get(key) != value:
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print(line)
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env[key] = value
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if env == os.environ:
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raise ValueError(f"Found no variables in {env_script.name} output:\n"
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+ env_output)
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print(">", " ".join(map(str, command)))
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try:
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subprocess.run(command, check=True, env=env, **kwargs)
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except subprocess.CalledProcessError as e:
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sys.exit(e)
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def build_python_path():
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"""The path to the build Python binary."""
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build_dir = subdir("build")
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binary = build_dir / "python"
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if not binary.is_file():
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binary = binary.with_suffix(".exe")
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if not binary.is_file():
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raise FileNotFoundError("Unable to find `python(.exe)` in "
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f"{build_dir}")
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return binary
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def configure_build_python(context):
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os.chdir(subdir("build", clean=context.clean))
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command = [relpath(CHECKOUT / "configure")]
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if context.args:
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command.extend(context.args)
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run(command)
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def make_build_python(context):
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os.chdir(subdir("build"))
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run(["make", "-j", str(os.cpu_count())])
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def unpack_deps(host):
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deps_url = "https://github.com/beeware/cpython-android-source-deps/releases/download"
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for name_ver in ["bzip2-1.0.8-1", "libffi-3.4.4-2", "openssl-3.0.13-1",
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"sqlite-3.45.1-0", "xz-5.4.6-0"]:
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filename = f"{name_ver}-{host}.tar.gz"
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run(["wget", f"{deps_url}/{name_ver}/{filename}"])
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run(["tar", "-xf", filename])
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os.remove(filename)
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def configure_host_python(context):
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host_dir = subdir(context.host, clean=context.clean)
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prefix_dir = host_dir / "prefix"
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if not prefix_dir.exists():
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prefix_dir.mkdir()
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os.chdir(prefix_dir)
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unpack_deps(context.host)
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build_dir = host_dir / "build"
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build_dir.mkdir(exist_ok=True)
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os.chdir(build_dir)
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command = [
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# Basic cross-compiling configuration
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relpath(CHECKOUT / "configure"),
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f"--host={context.host}",
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f"--build={sysconfig.get_config_var('BUILD_GNU_TYPE')}",
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f"--with-build-python={build_python_path()}",
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"--without-ensurepip",
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# Android always uses a shared libpython.
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"--enable-shared",
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"--without-static-libpython",
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# Dependent libraries. The others are found using pkg-config: see
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# android-env.sh.
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f"--with-openssl={prefix_dir}",
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]
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if context.args:
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command.extend(context.args)
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run(command, host=context.host)
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def make_host_python(context):
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host_dir = subdir(context.host)
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os.chdir(host_dir / "build")
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run(["make", "-j", str(os.cpu_count())], host=context.host)
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run(["make", "install", f"prefix={host_dir}/prefix"], host=context.host)
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def build_all(context):
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steps = [configure_build_python, make_build_python, configure_host_python,
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make_host_python]
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for step in steps:
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step(context)
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def clean_all(context):
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delete_if_exists(CROSS_BUILD_DIR)
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def main():
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parser = argparse.ArgumentParser()
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subcommands = parser.add_subparsers(dest="subcommand")
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build = subcommands.add_parser("build", help="Build everything")
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configure_build = subcommands.add_parser("configure-build",
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help="Run `configure` for the "
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"build Python")
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make_build = subcommands.add_parser("make-build",
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help="Run `make` for the build Python")
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configure_host = subcommands.add_parser("configure-host",
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help="Run `configure` for Android")
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make_host = subcommands.add_parser("make-host",
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help="Run `make` for Android")
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clean = subcommands.add_parser("clean", help="Delete files and directories "
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"created by this script")
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for subcommand in build, configure_build, configure_host:
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subcommand.add_argument(
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"--clean", action="store_true", default=False, dest="clean",
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help="Delete any relevant directories before building")
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for subcommand in build, configure_host, make_host:
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subcommand.add_argument(
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"host", metavar="HOST",
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choices=["aarch64-linux-android", "x86_64-linux-android"],
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help="Host triplet: choices=[%(choices)s]")
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for subcommand in build, configure_build, configure_host:
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subcommand.add_argument("args", nargs="*",
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help="Extra arguments to pass to `configure`")
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context = parser.parse_args()
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dispatch = {"configure-build": configure_build_python,
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"make-build": make_build_python,
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"configure-host": configure_host_python,
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"make-host": make_host_python,
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"build": build_all,
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"clean": clean_all}
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dispatch[context.subcommand](context)
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if __name__ == "__main__":
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main()
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@ -211,6 +211,10 @@ struct _ts {
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# define Py_C_RECURSION_LIMIT 800
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#elif defined(_WIN32)
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# define Py_C_RECURSION_LIMIT 3000
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#elif defined(__ANDROID__)
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// On an ARM64 emulator, API level 34 was OK with 10000, but API level 21
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// crashed in test_compiler_recursion_limit.
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# define Py_C_RECURSION_LIMIT 3000
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#elif defined(_Py_ADDRESS_SANITIZER)
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# define Py_C_RECURSION_LIMIT 4000
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#else
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@ -0,0 +1 @@
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Add Android build script and instructions.
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@ -17595,13 +17595,21 @@ fi
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if test "$ac_sys_system" = "Linux-android"; then
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# When these functions are used in an unprivileged process, they crash rather
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# than returning an error.
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privileged_funcs="chroot initgroups setegid seteuid setgid setregid setresgid
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setresuid setreuid setuid"
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blocked_funcs="chroot initgroups setegid seteuid setgid sethostname
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setregid setresgid setresuid setreuid setuid"
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# These functions are unimplemented and always return an error.
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unimplemented_funcs="sem_open sem_unlink"
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# These functions are unimplemented and always return an error
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# (https://android.googlesource.com/platform/system/sepolicy/+/refs/heads/android13-release/public/domain.te#1044)
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blocked_funcs="$blocked_funcs sem_open sem_unlink"
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for name in $privileged_funcs $unimplemented_funcs; do
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# Before API level 23, when fchmodat is called with the unimplemented flag
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# AT_SYMLINK_NOFOLLOW, instead of returning ENOTSUP as it should, it actually
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# follows the symlink.
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if test "$ANDROID_API_LEVEL" -lt 23; then
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blocked_funcs="$blocked_funcs fchmodat"
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fi
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for name in $blocked_funcs; do
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as_func_var=`printf "%s\n" "ac_cv_func_$name" | $as_tr_sh`
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eval "$as_func_var=no"
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@ -22156,6 +22164,10 @@ fi
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done
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fi
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# On Android before API level 23, clock_nanosleep returns the wrong value when
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# interrupted by a signal (https://issuetracker.google.com/issues/216495770).
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if ! { test "$ac_sys_system" = "Linux-android" &&
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test "$ANDROID_API_LEVEL" -lt 23; }; then
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for ac_func in clock_nanosleep
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do :
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@ -22213,6 +22225,7 @@ fi
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fi
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done
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fi
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for ac_func in nanosleep
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|
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27
configure.ac
27
configure.ac
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@ -4934,13 +4934,21 @@ fi
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if test "$ac_sys_system" = "Linux-android"; then
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# When these functions are used in an unprivileged process, they crash rather
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# than returning an error.
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privileged_funcs="chroot initgroups setegid seteuid setgid setregid setresgid
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setresuid setreuid setuid"
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blocked_funcs="chroot initgroups setegid seteuid setgid sethostname
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setregid setresgid setresuid setreuid setuid"
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# These functions are unimplemented and always return an error.
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unimplemented_funcs="sem_open sem_unlink"
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# These functions are unimplemented and always return an error
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# (https://android.googlesource.com/platform/system/sepolicy/+/refs/heads/android13-release/public/domain.te#1044)
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blocked_funcs="$blocked_funcs sem_open sem_unlink"
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for name in $privileged_funcs $unimplemented_funcs; do
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# Before API level 23, when fchmodat is called with the unimplemented flag
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# AT_SYMLINK_NOFOLLOW, instead of returning ENOTSUP as it should, it actually
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# follows the symlink.
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if test "$ANDROID_API_LEVEL" -lt 23; then
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blocked_funcs="$blocked_funcs fchmodat"
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fi
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for name in $blocked_funcs; do
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AS_VAR_PUSHDEF([func_var], [ac_cv_func_$name])
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AS_VAR_SET([func_var], [no])
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AS_VAR_POPDEF([func_var])
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@ -5303,11 +5311,16 @@ then
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])
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fi
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AC_CHECK_FUNCS([clock_nanosleep], [], [
|
||||
# On Android before API level 23, clock_nanosleep returns the wrong value when
|
||||
# interrupted by a signal (https://issuetracker.google.com/issues/216495770).
|
||||
if ! { test "$ac_sys_system" = "Linux-android" &&
|
||||
test "$ANDROID_API_LEVEL" -lt 23; }; then
|
||||
AC_CHECK_FUNCS([clock_nanosleep], [], [
|
||||
AC_CHECK_LIB([rt], [clock_nanosleep], [
|
||||
AC_DEFINE([HAVE_CLOCK_NANOSLEEP], [1])
|
||||
])
|
||||
])
|
||||
])
|
||||
fi
|
||||
|
||||
AC_CHECK_FUNCS([nanosleep], [], [
|
||||
AC_CHECK_LIB([rt], [nanosleep], [
|
||||
|
|
|
|||
Loading…
Reference in New Issue