cpython/Platforms/Android/android-env.sh at 3.15 · python/cpython · GitHub

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# This script must be sourced with the following variables already set:

: "${ANDROID_HOME:?}" # Path to Android SDK

: "${HOST:?}" # GNU target triplet

# You may also override the following:

: "${ANDROID_API_LEVEL:=24}" # Minimum Android API level the build will run on

: "${PREFIX:-}" # Path in which to find required libraries

# Print all messages on stderr so they're visible when stdout is captured.

log() {

echo "$1" >&2

}

fail() {

log "$1"

exit 1

}

# When moving to a new version of the NDK, carefully review the following:

# * https://developer.android.com/ndk/downloads/revision_history

# * https://android.googlesource.com/platform/ndk/+/ndk-rXX-release/docs/BuildSystemMaintainers.md

# where XX is the NDK version. Do a diff against the version you're upgrading from, e.g.:

# https://android.googlesource.com/platform/ndk/+/ndk-r25-release..ndk-r26-release/docs/BuildSystemMaintainers.md

ndk_version=27.3.13750724

ndk=$ANDROID_HOME/ndk/$ndk_version

if ! [ -e "$ndk/package.xml" ]; then

log "Installing NDK - this may take several minutes"

yes | "$ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager" "ndk;$ndk_version"

if [ "$HOST" = "arm-linux-androideabi" ]; then

clang_triplet=armv7a-linux-androideabi

else

clang_triplet="$HOST"

# These variables are based on BuildSystemMaintainers.md above, and

# $ndk/build/cmake/android.toolchain.cmake.

toolchain=$(echo "$ndk"/toolchains/llvm/prebuilt/*)

export AR="$toolchain/bin/llvm-ar"

export AS="$toolchain/bin/llvm-as"

export CC="$toolchain/bin/${clang_triplet}${ANDROID_API_LEVEL}-clang"

export CXX="${CC}++"

export LD="$toolchain/bin/ld"

export NM="$toolchain/bin/llvm-nm"

export RANLIB="$toolchain/bin/llvm-ranlib"

export READELF="$toolchain/bin/llvm-readelf"

export STRIP="$toolchain/bin/llvm-strip"

# The quotes make sure the wildcard in the `toolchain` assignment has been expanded.

for path in "$AR" "$AS" "$CC" "$CXX" "$LD" "$NM" "$RANLIB" "$READELF" "$STRIP"; do

if ! [ -e "$path" ]; then

fail "$path does not exist"

done

export CFLAGS="-D__BIONIC_NO_PAGE_SIZE_MACRO"

export LDFLAGS="-Wl,--build-id=sha1 -Wl,--no-rosegment -Wl,-z,max-page-size=16384"

# Unlike Linux, Android does not implicitly use a dlopened library to resolve

# relocations in subsequently-loaded libraries, even if RTLD_GLOBAL is used

# (https://github.com/android/ndk/issues/1244). So any library that fails to

# build with this flag, would also fail to load at runtime.

LDFLAGS="$LDFLAGS -Wl,--no-undefined"

# Many packages get away with omitting -lm on Linux, but Android is stricter.

LDFLAGS="$LDFLAGS -lm"

# -mstackrealign is included where necessary in the clang launcher scripts which are

# pointed to by $CC, so we don't need to include it here.

if [ "$HOST" = "arm-linux-androideabi" ]; then

CFLAGS="$CFLAGS -march=armv7-a -mthumb"

if [ -n "${PREFIX:-}" ]; then

abs_prefix="$(realpath "$PREFIX")"

CFLAGS="$CFLAGS -I$abs_prefix/include"

LDFLAGS="$LDFLAGS -L$abs_prefix/lib"

export PKG_CONFIG="pkg-config --define-prefix"

export PKG_CONFIG_LIBDIR="$abs_prefix/lib/pkgconfig"

# When compiling C++, some build systems will combine CFLAGS and CXXFLAGS, and some will

# use CXXFLAGS alone.

export CXXFLAGS="$CFLAGS"

# Use the same variable name as conda-build

if [ "$(uname)" = "Darwin" ]; then

CPU_COUNT="$(sysctl -n hw.ncpu)"

export CPU_COUNT

else

CPU_COUNT="$(nproc)"

export CPU_COUNT

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