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builder/docker/Dockerfile

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+# syntax=docker/dockerfile:1
+
+# FreeBSD 15.1 sysroot used only for headers and target libraries.
+FROM ubuntu:24.04 AS sysroot
+ARG FREEBSD_RELEASE=15.1-RELEASE
+ARG FREEBSD_MIRROR=https://download.freebsd.org/releases/amd64/amd64
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+        ca-certificates wget xz-utils \
+    && rm -rf /var/lib/apt/lists/*
+WORKDIR /tmp/freebsd
+RUN set -eux; \
+    url="${FREEBSD_MIRROR}/${FREEBSD_RELEASE}"; \
+    wget -q "${url}/base.txz" -O base.txz; \
+    wget -q "${url}/MANIFEST" -O MANIFEST; \
+    expected="$(awk '$1 == "base.txz" { print $2; exit }' MANIFEST)"; \
+    test -n "$expected"; \
+    echo "$expected  base.txz" | sha256sum -c -; \
+    mkdir -p /freebsd-sysroot; \
+    tar -xJf base.txz -C /freebsd-sysroot ./lib ./usr/include ./usr/lib
+
+# RustProxy requires rust-version = 1.88.
+FROM rust:1.88-slim-bookworm AS builder
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+        ca-certificates clang lld llvm file git perl pkg-config python3 \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY --from=sysroot /freebsd-sysroot /opt/freebsd-sysroot
+RUN rustup target add x86_64-unknown-freebsd
+
+ENV CARGO_TARGET_X86_64_UNKNOWN_FREEBSD_LINKER=clang \
+    CC_x86_64_unknown_freebsd=clang \
+    CXX_x86_64_unknown_freebsd=clang++ \
+    AR_x86_64_unknown_freebsd=llvm-ar \
+    RANLIB_x86_64_unknown_freebsd=llvm-ranlib \
+    RUST_PROXY_PYTHON=python3 \
+    CFLAGS_x86_64_unknown_freebsd="--target=x86_64-unknown-freebsd15.1 --sysroot=/opt/freebsd-sysroot" \
+    CXXFLAGS_x86_64_unknown_freebsd="--target=x86_64-unknown-freebsd15.1 --sysroot=/opt/freebsd-sysroot" \
+    CARGO_TARGET_X86_64_UNKNOWN_FREEBSD_RUSTFLAGS="-C link-arg=--target=x86_64-unknown-freebsd15.1 -C link-arg=--sysroot=/opt/freebsd-sysroot -C link-arg=-fuse-ld=lld"
+
+WORKDIR /src
+CMD ["bash"]