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Forked from Jake-Shadle/xwin.dockerfile
Created May 13, 2024 13:40
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Example dockerfile for cross compilation of `x86_64-pc-windows-msvc` Rust binaries in a Linux container
# We'll just use the official Rust image rather than build our own from scratch
FROM docker.io/library/rust:1.54.0-slim-bullseye
ENV KEYRINGS /usr/local/share/keyrings
RUN set -eux; \
mkdir -p $KEYRINGS; \
apt-get update && apt-get install -y gpg curl; \
# clang/lld/llvm
curl --fail https://apt.llvm.org/llvm-snapshot.gpg.key | gpg --dearmor > $KEYRINGS/llvm.gpg; \
# wine
curl --fail https://dl.winehq.org/wine-builds/winehq.key | gpg --dearmor > $KEYRINGS/winehq.gpg; \
echo "deb [signed-by=$KEYRINGS/llvm.gpg] http://apt.llvm.org/bullseye/ llvm-toolchain-bullseye-13 main" > /etc/apt/sources.list.d/llvm.list; \
echo "deb [signed-by=$KEYRINGS/winehq.gpg] https://dl.winehq.org/wine-builds/debian/ bullseye main" > /etc/apt/sources.list.d/winehq.list;
RUN set -eux; \
dpkg --add-architecture i386; \
# Skipping all of the "recommended" cruft reduces total images size by ~300MiB
apt-get update && apt-get install --no-install-recommends -y \
clang-13 \
# llvm-ar
llvm-13 \
lld-13 \
# get a recent wine so we can run tests
winehq-staging \
# Unpack xwin
tar; \
# ensure that clang/clang++ are callable directly
ln -s clang-13 /usr/bin/clang && ln -s clang /usr/bin/clang++ && ln -s lld-13 /usr/bin/ld.lld; \
# We also need to setup symlinks ourselves for the MSVC shims because they aren't in the debian packages
ln -s clang-13 /usr/bin/clang-cl && ln -s llvm-ar-13 /usr/bin/llvm-lib && ln -s lld-link-13 /usr/bin/lld-link; \
# Verify the symlinks are correct
clang++ -v; \
ld.lld -v; \
# Doesn't have an actual -v/--version flag, but it still exits with 0
llvm-lib -v; \
clang-cl -v; \
lld-link --version; \
# Use clang instead of gcc when compiling binaries targeting the host (eg proc macros, build files)
update-alternatives --install /usr/bin/cc cc /usr/bin/clang 100; \
update-alternatives --install /usr/bin/c++ c++ /usr/bin/clang++ 100; \
apt-get remove -y --auto-remove; \
rm -rf /var/lib/apt/lists/*;
# Retrieve the std lib for the target
RUN rustup target add x86_64-pc-windows-msvc
RUN set -eux; \
xwin_version="0.1.1"; \
xwin_prefix="xwin-$xwin_version-x86_64-unknown-linux-musl"; \
# Install xwin to cargo/bin via github release. Note you could also just use `cargo install xwin`.
curl --fail -L https://github.com/Jake-Shadle/xwin/releases/download/$xwin_version/$xwin_prefix.tar.gz | tar -xzv -C /usr/local/cargo/bin --strip-components=1 $xwin_prefix/xwin; \
# Splat the CRT and SDK files to /xwin/crt and /xwin/sdk respectively
xwin --accept-license 1 splat --output /xwin; \
# Remove unneeded files to reduce image size
rm -rf .xwin-cache /usr/local/cargo/bin/xwin;
# Note that we're using the full target triple for each variable instead of the
# simple CC/CXX/AR shorthands to avoid issues when compiling any C/C++ code for
# build dependencies that need to compile and execute in the host environment
ENV CC_x86_64_pc_windows_msvc="clang-cl" \
CXX_x86_64_pc_windows_msvc="clang-cl" \
AR_x86_64_pc_windows_msvc="llvm-lib" \
# wine can be quite spammy with log messages and they're generally uninteresting
WINEDEBUG="-all" \
# Use wine to run test executables
CARGO_TARGET_X86_64_PC_WINDOWS_MSVC_RUNNER="wine" \
# Note that we only disable unused-command-line-argument here since clang-cl
# doesn't implement all of the options supported by cl, but the ones it doesn't
# are _generally_ not interesting.
CL_FLAGS="-Wno-unused-command-line-argument -fuse-ld=lld-link /imsvc/xwin/crt/include /imsvc/xwin/sdk/include/ucrt /imsvc/xwin/sdk/include/um /imsvc/xwin/sdk/include/shared" \
# Let cargo know what linker to invoke if you haven't already specified it
# in a .cargo/config.toml file
CARGO_TARGET_X86_64_PC_WINDOWS_MSVC_LINKER="lld-link" \
RUSTFLAGS="-Lnative=/xwin/crt/lib/x86_64 -Lnative=/xwin/sdk/lib/um/x86_64 -Lnative=/xwin/sdk/lib/ucrt/x86_64"
# These are separate since docker/podman won't transform environment variables defined in the same ENV block
ENV CFLAGS_x86_64_pc_windows_msvc="$CL_FLAGS" \
CXXFLAGS_x86_64_pc_windows_msvc="$CL_FLAGS"
# Run wineboot just to setup the default WINEPREFIX so we don't do it every
# container run
RUN wine wineboot --init
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