mirror of https://github.com/python/cpython
94 lines
3.1 KiB
Bash
94 lines
3.1 KiB
Bash
# 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 "$path does not exist"
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fi
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done
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export CFLAGS=""
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export LDFLAGS="-Wl,--build-id=sha1 -Wl,--no-rosegment"
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# Unlike Linux, Android does not implicitly use a dlopened library to resolve
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# relocations in subsequently-loaded libraries, even if RTLD_GLOBAL is used
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# (https://github.com/android/ndk/issues/1244). So any library that fails to
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# build with this flag, would also fail to load at runtime.
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LDFLAGS="$LDFLAGS -Wl,--no-undefined"
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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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