Dockerfile.toolchain

# syntax=docker/dockerfile:1

# https://hub.docker.com/_/ubuntu
FROM docker.io/library/ubuntu:24.04 AS base
ARG QEMU_CPU=
SHELL ["/bin/bash", "-eux", "-o", "pipefail", "-c"]

WORKDIR /

ENV DEBIAN_FRONTEND=noninteractive \
    LANG=C.UTF-8 \
    TZ=UTC \
    TERM=xterm-256color

# Make sure we have basic dev tools for building.
# We only build the gcc musl based toolchain here
# and use these compiled files later in other Docker builds.
# This saves time during the building of the actual libraries
# we want to build since the toolchain doesn't change that much anyway.
#
RUN <<EOF
    apt-get update
    apt-get install -y \
        gcc-14 g++-14 cpp-14 \
        make \
        cmake \
        libtool \
        pkg-config \
        curl \
        patch \
        file \
        bzip2 \
        xz-utils \
        unzip \
        rsync \
        texinfo \
        ca-certificates \
        --no-install-recommends

    # Set GCC14 As default
    update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-14 90 \
      --slave /usr/bin/cc cc /usr/bin/gcc-14 \
      --slave /usr/bin/gcc-ar gcc-ar /usr/bin/gcc-ar-14 \
      --slave /usr/bin/gcc-nm gcc-nm /usr/bin/gcc-nm-14 \
      --slave /usr/bin/gcc-ranlib gcc-ranlib /usr/bin/gcc-ranlib-14

    update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-14 90 \
      --slave /usr/bin/c++ c++ /usr/bin/g++-14

    update-alternatives --install /lib/cpp cpp /usr/bin/cpp-14 90 && \
    update-alternatives --install /usr/bin/gcov gcov /usr/bin/gcov-14 90 \
      --slave /usr/bin/gcov-dump gcov-dump /usr/bin/gcov-dump-14 \
      --slave /usr/bin/gcov-tool gcov-tool /usr/bin/gcov-tool-14

    # Cleanup apt
    apt-get autoremove -y --purge
    apt-get clean -y
    rm -rf /var/cache/* /var/lib/apt/lists/*
    # Default cleanups
    find /var/log -type f -delete
    # Pre-Create the /musl-cross-make directory
    mkdir -pv /musl-cross-make
EOF

WORKDIR /musl-cross-make

FROM base AS build
ARG TARGETARCH
ARG TARGET=x86_64-unknown-linux-musl

COPY config.mak /musl-cross-make/config.mak

# 3635262e4524c991552789af6f36211a335a77b3 == Jul 27, 2025, 3:34 AM GMT+2
ARG MUSL_CROSS_MAKE_HASH=3635262e4524c991552789af6f36211a335a77b3
ARG ARCH_COMMON_CONFIG=""
RUN <<EOF
    echo "Downloading musl-cross-make"

    # Download musl-cross-make from https://github.com/richfelker/musl-cross-make based upon the provided $MUSL_CROSS_MAKE_HASH
    curl -w"%{stderr}URL: %{url_effective}\nTime: %{time_total}\nSize: %{size_download}\n" --retry 5 --retry-all-errors \
      -sSL "https://github.com/richfelker/musl-cross-make/archive/${MUSL_CROSS_MAKE_HASH}.tar.gz" | \
      tar xzf - --strip-components=1

    mkdir -p /usr/local/musl

    echo "Building musl toolchain for target ${TARGET}"

    # Build the actual toolchain here
    # We store the toolchain in /usr/local/musl
    make -j"$(nproc)" install > /dev/null

    # Fix symlink to libc.so
    ln -sfrn "/usr/local/musl/${TARGET}/lib/libc.so" "$(ls -1 /usr/local/musl/${TARGET}/lib/ld-*.so.1)"

    # Cleanup
    cd /
    rm -rf /musl-cross-make /usr/local/musl/share/man

    echo "Finished building target ${TARGET}"
EOF

RUN <<EOF
    echo "Fix glibc for Busybox"
    # Make the newer glibc libraries available in /arch-lib so we can copy them to the busybox container
    mkdir -pv /arch-lib
    if [ "${TARGETARCH}" = "arm64" ]; then
      ln -sfn /usr/lib/aarch64-linux-gnu/{ld-linux-aarch64.so.1,libc.so.6,libm.so.6} /arch-lib/
    else
      ln -sfn /usr/lib/x86_64-linux-gnu/{ld-linux-x86-64.so.2,libc.so.6,libm.so.6} /arch-lib/
    fi
EOF

# https://hub.docker.com/_/busybox
FROM docker.io/busybox:1.37.0-glibc
WORKDIR /

ENV PATH="${PATH}:/usr/local/musl/bin" \
    LANG=C.UTF-8 \
    TZ=UTC \
    TERM=xterm-256color
ARG TARGET

COPY --link --from=build /usr/local/musl /usr/local/musl

# Use newer lib's than currently provided in the busybox container
# aarch64-linux-gnu
COPY --link --from=build /arch-lib/* /lib/

LABEL org.opencontainers.image.authors="BlackDex <black.dex@gmail.com>"
LABEL org.opencontainers.image.documentation="https://github.com/BlackDex/rust-musl/"
LABEL org.opencontainers.image.licenses="Apache License 2.0"
LABEL org.opencontainers.image.url="https://github.com/BlackDex/rust-musl/"
LABEL org.opencontainers.image.description="MUSL Cross Build Toolchain for ${TARGET}"