How to cross-compile extension for host android arm64?

[Ragnoroct]

For the life of me I cannot figure out how to cross-compile this package to run on android arm64. I have a working python compilation but I can't get this package to work.

The furthest I got was compiling frida/_frida/_frida.abi3.so.p/extension.c.o by adding my cross-compiled python /include dir. It now fails trying to link frida/_frida/_frida.abi3.so because it can't find -lpthread, ect. Which sort of makes sense because android does not have those libs but it is included in their libc implementation.

What do I do to fix this? I want to run Python on my Android device via ADB and connect to the frida-server locally.

When I manually add my ndk lib as a -L link to LDFLAGS I just get more errors.
-L$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/lib/aarch64-linux-android

#27 98.04 ld: error: unable to find library -lpthread
#27 98.04 ld: error: unable to find library -lcrypt
#27 98.04 ld: error: unable to find library -lutil

The furthest I get is #27 98.04 [268/268] Linking target frida/_frida/_frida.abi3.so

#27 98.03 [267/268] Compiling C object frida/_frida/_frida.abi3.so.p/extension.c.o
#27 98.04 [268/268] Linking target frida/_frida/_frida.abi3.so
#27 98.04 FAILED: frida/_frida/_frida.abi3.so 
#27 98.04 /opt/android-ndk-r25c/toolchains/llvm/prebuilt/linux-x86_64/bin/clang -target aarch64-none-linux-android21  -o frida/_frida/_frida.abi3.so frida/_frida/_frida.abi3.so.p/extension.c.o -L/cpython/cross-build/aarch64-linux-android/prefix/lib -Wl,--as-needed -Wl,--allow-shlib-undefined -shared -fPIC -Wl,-z,relro -Wl,-z,noexecstack -Wl,--gc-sections '-Wl,-rpath,$ORIGIN/../../subprojects/frida-core/src/api' -Wl,-rpath-link,/frida/build/subprojects/frida-core/src/api -Wl,--start-group subprojects/frida-core/src/api/libfrida-core-1.0.a subprojects/frida-gum/gum/libfrida-gum-1.0.a subprojects/frida-gum/bindings/gumjs/libfrida-gumjs-inspector-1.0.a subprojects/frida-core/lib/selinux/libfrida-selinux.a -Wl,--version-script,/frida/frida/_frida/extension.version -lpthread -ldl -lm -lcrypt -lutil /frida/deps/sdk-android-arm64/lib/libglib-2.0.a -pthread /frida/deps/sdk-android-arm64/lib/libiconv.a /frida/deps/sdk-android-arm64/lib/libpcre2-8.a /frida/deps/sdk-android-arm64/lib/libgobject-2.0.a /frida/deps/sdk-android-arm64/lib/libffi.a -Wl,--export-dynamic /frida/deps/sdk-android-arm64/lib/libgmodule-2.0.a /frida/deps/sdk-android-arm64/lib/libgio-2.0.a /frida/deps/sdk-android-arm64/lib/libz.a /frida/deps/sdk-android-arm64/lib/libgee-0.8.a /frida/deps/sdk-android-arm64/lib/libjson-glib-1.0.a -llog /frida/deps/sdk-android-arm64/lib/libcapstone.a /frida/deps/sdk-android-arm64/lib/libsoup-3.0.a /frida/deps/sdk-android-arm64/lib/libsqlite3.a /frida/deps/sdk-android-arm64/lib/libpsl.a /frida/deps/sdk-android-arm64/lib/libbrotlidec.a /frida/deps/sdk-android-arm64/lib/libbrotlicommon.a /frida/deps/sdk-android-arm64/lib/libnghttp2.a /frida/deps/sdk-android-arm64/lib/gio/modules/libgioopenssl.a /frida/deps/sdk-android-arm64/lib/libssl.a /frida/deps/sdk-android-arm64/lib/libcrypto.a /frida/deps/sdk-android-arm64/lib/libquickjs.a /frida/deps/sdk-android-arm64/lib/libselinux.a /frida/deps/sdk-android-arm64/lib/libsepol.a /frida/deps/sdk-android-arm64/lib/libnice.a /frida/deps/sdk-android-arm64/lib/libgthread-2.0.a /frida/deps/sdk-android-arm64/lib/libusrsctp.a /frida/deps/sdk-android-arm64/lib/liblzma.a /frida/deps/sdk-android-arm64/lib/libunwind.a /frida/deps/sdk-android-arm64/lib/libelf.a /frida/deps/sdk-android-arm64/lib/libdwarf.a /frida/deps/sdk-android-arm64/lib/libminizip.a -llog -Wl,--end-group
#27 98.04 ld: error: unable to find library -lpthread
#27 98.04 ld: error: unable to find library -lcrypt
#27 98.04 ld: error: unable to find library -lutil
#27 98.04 clang-14: error: linker command failed with exit code 1 (use -v to see invocation)

FROM ubuntu:20.04
# ... cross-compiles python parts omitted

# install dependencies
ENV DEBIAN_FRONTEND=noninteractive
RUN apt-get update && apt-get install -y \
    # install dependencies
    curl unzip git tar xz-utils \
    # install nodejs
    && curl -fsSL https://deb.nodesource.com/setup_20.x | bash - \
    && apt-get install -y nodejs \
    # install python
    && apt-get install -y software-properties-common \
    && add-apt-repository ppa:deadsnakes/ppa \
    && apt-get update \
    && apt-get install -y python3.9 python3.9-venv python3.9-distutils python3.9-dev python3-pip \
    && python3.9 -m pip install --upgrade pip setuptools \
    # frida build dependencies \
    && apt-get install -y build-essential git lib32stdc++-9-dev libc6-dev-i386 \
    # clean
    && apt-get clean

# install ndk
RUN curl -L https://dl.google.com/android/repository/android-ndk-r25c-linux.zip -o /tmp/android-ndk.zip && \
    unzip -q /tmp/android-ndk.zip -d /opt && \
    rm /tmp/android-ndk.zip
ENV ANDROID_NDK_ROOT=/opt/android-ndk-r25c

# fetch frida-python git repo
ENV VERSION_FRIDA="16.6.2"
RUN git clone --depth 1 https://github.com/frida/frida-python.git /frida \
    && cd /frida \
    && git fetch --depth 1 origin "$VERSION_FRIDA" \
    && git fetch origin refs/tags/$VERSION_FRIDA:refs/tags/$VERSION_FRIDA \
    && git checkout refs/tags/"$VERSION_FRIDA" \
    && git checkout -b "$VERSION_FRIDA-branch" \
    && git submodule update --init --recursive --depth 1

RUN curl -L https://github.com/frida/frida/releases/download/$VERSION_FRIDA/frida-core-devkit-$VERSION_FRIDA-android-arm64.tar.xz -o /tmp/download.tar.xz && \
    mkdir /frida-core-devkit && \
    tar -xf /tmp/download.tar.xz --strip-components=1 -C /frida-core-devkit && \
    rm /tmp/download.tar.xz

# note python3.9 was installed using apt-get. when I tried the cross-compile I got ELF errors... :P
WORKDIR /frida
ENV CFLAGS="-I/cpython/cross-build/aarch64-linux-android/prefix/include/python3.13"
ENV LDFLAGS="-L/cpython/cross-build/aarch64-linux-android/prefix/lib"
RUN python3.9 -m venv /tmp/venv-builder && \
    . /tmp/venv-builder/bin/activate && \
    ./configure --host=android-arm64 \
    && make