Dockerfile

FROM debian:12 AS bdwgc

RUN apt-get update \
 && apt-get install -y build-essential automake libtool git clang-16

ARG release
ENV CFLAGS="-fPIC -pipe ${release:+-O2}"
ENV CC="clang-16"

# Build libgc
ARG gc_version

RUN git clone https://github.com/ivmai/bdwgc \
 && cd bdwgc \
 && git checkout ${gc_version} \
 && ./autogen.sh \
 && ./configure --disable-debug --disable-shared --enable-large-config \
 && make -j$(nproc)

FROM alpine:3.20

# Install dependencies
RUN apk add --no-cache \
      # Statically-compiled llvm
      llvm18-dev llvm18-static \
      # Static stdlib dependencies
      gc-dev zlib-static yaml-static libxml2-static pcre2-dev libevent-static zstd-static \
      # Static compiler dependencies
      libffi-dev \
      # Build tools
      git gcc g++ make automake libtool autoconf bash coreutils curl

ARG release
ENV CFLAGS="-fPIC -pipe ${release:+-O2}"

# This overrides default CRYSTAL_LIBRARY_PATH baked into the binary (starting with 1.2.0)
# or configured via wrapper script (before 1.2.0) because we want to link against
# the regularly installed libraries, not the ones shipped with the bootstrap compiler.
# This particularly affects libgc which was bundled upto Crystal 1.12
ENV CRYSTAL_LIBRARY_PATH=""

RUN llvm18-config --version

ARG previous_crystal_release
ADD ${previous_crystal_release} /tmp/crystal.tar.gz
ENV PATH=${PATH}:/tmp/crystal/bin/
RUN mkdir -p /tmp/crystal \
  && tar xz -f /tmp/crystal.tar.gz -C /tmp/crystal --strip-component=1 \
  && crystal --version \
  && shards --version

# Build crystal
ARG crystal_repo=https://github.com/crystal-lang/crystal
ARG crystal_version
ARG crystal_sha1
ARG gnu_target
RUN git clone ${crystal_repo} \
 && cd crystal \
 && git checkout ${crystal_sha1} \
 \
 && make crystal stats=true static=true ${release:+release=true} \
                 CRYSTAL_CONFIG_TARGET=${gnu_target} \
 && ([ "$(ldd .build/crystal 2>&1 | wc -l)" -eq "1" ] || { echo './build/crystal is not statically linked'; ldd .build/crystal; exit 1; })

# Build shards
ARG shards_version
ARG musl_target
RUN git clone https://github.com/crystal-lang/shards \
 && cd shards \
 && git checkout ${shards_version} \
 && make SHARDS=false CRYSTAL=/crystal/bin/crystal \
         FLAGS="--stats --target ${musl_target} --static ${release:+--release}" \
 \
 && ([ "$(ldd bin/shards 2>&1 | wc -l)" -eq "1" ] || { echo 'shards is not statically linked'; ldd bin/shards; exit 1; })

COPY --from=bdwgc /bdwgc/.libs/libgc.a /libgc-debian.a

ARG package_iteration

RUN \
 # Copy libgc.a to /lib/crystal/
 mkdir -p /output/lib/crystal/ \
 && cp /libgc-debian.a /output/lib/crystal/libgc.a \
 \
 # Install crystal
 && make -C /crystal install DESTDIR=/output PREFIX= \
 \
 # Install shards
 && make -C /shards install DESTDIR=/output PREFIX= \
 \
 # Create tarball
 && mv /output /crystal-${crystal_version}-${package_iteration} \
 && mkdir /output \
 && tar -cvf /output/crystal-${crystal_version}-${package_iteration}.tar /crystal-${crystal_version}-${package_iteration}