Initial implementation

.cargo/config.toml

@@ -0,0 +1,2 @@
+[alias]
+xtask = "run --package xtask --"

.github/workflows/ci.yml

@@ -0,0 +1,86 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  schedule:
+    - cron: 00 4 * * *
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  lint-stable:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: stable
+          components: clippy, rust-src
+
+      - name: Run clippy
+        run: cargo clippy --all-targets --workspace -- --deny warnings
+
+  lint-nightly:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly
+          components: rustfmt, rust-src
+
+      - name: Check formatting
+        run: cargo fmt --all -- --check
+
+  build-container-image:
+    runs-on: ubuntu-22.04
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - target: aarch64-unknown-linux-gnu
+            type: cross
+          - target: aarch64-unknown-linux-musl
+            type: cross
+          - target: riscv64gc-unknown-linux-gnu
+            type: cross
+          - target: x86_64-unknown-linux-gnu
+            type: native
+          - target: x86_64-unknown-linux-musl
+            type: native
+    name: container ${{ matrix.type }} ${{ matrix.target }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+
+      - name: Log in to GitHub Container Registry
+        run: |
+          set -euxo pipefail
+          echo "${{ secrets.GITHUB_TOKEN }}" | \
+            docker login ghcr.io -u ${{ github.actor }} --password-stdin
+
+      - name: Build container image
+        if: github.ref == 'refs/heads/main'
+        run: |
+          cargo xtask build-container-image \
+            --tag ghcr.io/${{ github.repository }}/${{ matrix.type }}-${{ matrix.target }}:latest \
+            --target ${{ matrix.target }} \
+            --push
+
+      - name: Build container image
+        if: github.ref != 'refs/heads/main'
+        run: |
+          cargo xtask build-container-image \
+            --tag ghcr.io/${{ github.repository }}/${{ matrix.type }}-${{ matrix.target }}:${{ github.head_ref }} \
+            --target ${{ matrix.target }} \
+            --push

.gitignore

@@ -18,4 +18,8 @@ Cargo.lock
 #  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
-#.idea/
+#.idea/
+
+# Added by cargo
+
+/target

Cargo.toml

@@ -0,0 +1,16 @@
+[workspace]
+members = [
+    "cross-llvm",
+    "xtask",
+]
+
+[workspace.dependencies]
+anyhow = "1.0.89"
+chrono = "0.4"
+clap = { version = "4.5", features = ["derive"] }
+target-lexicon = "0.12"
+thiserror = { version = "1.0.64" }
+uuid = { version = "1.10", features = ["v4"] }
+which = "6.0"
+
+cross-llvm = { path = "cross-llvm" }

containers/Dockerfile.cross-aarch64-unknown-linux-gnu

@@ -0,0 +1,43 @@
+FROM docker.io/debian:bookworm
+
+ENV PATH="/root/.cargo/bin:/usr/lib/llvm-18/bin:${PATH}"
+
+# Even though we are using clang as a C compiler, we need the libgcc_s and
+# libstdc++.
+RUN dpkg --add-architecture arm64 \
+    && apt update \
+    && apt install -y \
+        build-essential \
+        cmake \
+        curl \
+        gcc-aarch64-linux-gnu \
+        g++-aarch64-linux-gnu \
+        gnupg \
+        libc6-dev-arm64-cross \
+        libstdc++6:arm64 \
+        libzstd-dev \
+        libzstd-dev:arm64 \
+        lsb-release \
+        ninja-build \
+        qemu-user \
+        software-properties-common \
+        wget \
+        zlib1g-dev \
+        zlib1g-dev:arm64 \
+    && wget https://apt.llvm.org/llvm.sh \
+    && chmod +x llvm.sh \
+    && ./llvm.sh 18 \
+    && rm -f llvm.sh \
+    && curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y \
+    && rustup toolchain install stable --component rust-src \
+    && rustup toolchain install beta --component rust-src \
+    && rustup toolchain install nightly --component rust-src \
+    && rustup target add aarch64-unknown-linux-gnu \
+    && rustup +beta target add aarch64-unknown-linux-gnu \
+    && rustup +nightly target add aarch64-unknown-linux-gnu \
+    && cargo install btfdump \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY clang-cfg/aarch64-unknown-linux-gnu.cfg /etc/clang/cross
+COPY wrappers/aarch64-unknown-linux-gnu-clang /usr/bin
+COPY wrappers/aarch64-unknown-linux-gnu-clang++ /usr/bin

containers/Dockerfile.cross-aarch64-unknown-linux-musl

@@ -0,0 +1,78 @@
+FROM docker.io/gentoo/stage3:musl-llvm
+
+ENV PATH="/root/.cargo/bin:/usr/lib/llvm/18/bin:${PATH}"
+# Install only aarch64 user-space wrapper when installing app-emulation/qemu.
+ENV QEMU_USER_TARGETS="aarch64"
+# Enable static libraries for installed packages (zstd, zlib etc.).
+ENV USE="static-libs"
+
+# Use clang-musl-overlay patches[0], needed for QEMU to build successfully.
+#
+# Install llvm-libgcc, which is a drop-in replacement for libgcc_s runtime
+# library. It's needed by Rust binaries provided by rustup[1][2]. It's provided
+# in vadorovsky's private overlay.
+#
+# Create a cross sysroot using crossdev[3], which also creates wrappers for:
+# - clang, which can be used for compiling C/C++ projects without doing the
+#   whole dance with `--target` and `--sysroot` arguments.
+# - emerge, which let you install packages in the cross sysroot.
+#
+# Unpack the stage3 tarball into that sysroot to avoiding compilation of the
+# whole base system from scratch. Otherwise,
+# `emerge-aarch64-unknown-linux-musl @system` would take an eternity to run on
+# free GitHub runners.
+#
+# Patch the clang config to use libc++ and libunwind, before the necessary fix
+# in crossdev gets released[4].
+#
+# [0] https://github.com/clang-musl-overlay/gentoo-patchset
+# [1] https://github.com/rust-lang/rust/issues/119504
+# [2] https://github.com/rust-lang/rustup/issues/2213#issuecomment-1888615413
+# [3] https://wiki.gentoo.org/wiki/Crossdev
+# [4] https://github.com/gentoo/crossdev/pull/23
+RUN emerge --sync --quiet \
+    && emerge \
+        app-eselect/eselect-repository \
+        dev-vcs/git \
+        sys-devel/crossdev \
+    && eselect repository add vadorovsky git \
+        https://gitlab.com/vadorovsky/overlay \
+    && git clone --depth 1 \
+        https://github.com/clang-musl-overlay/gentoo-patchset \
+        /etc/portage/patches \
+    && emerge --sync --quiet \
+    && emerge \
+        app-emulation/qemu \
+        sys-libs/llvm-libgcc \
+    && eselect repository create crossdev \
+    && crossdev --llvm --target aarch64-unknown-linux-musl \
+    && curl -L "https://ftp-osl.osuosl.org/pub/gentoo/releases/arm64/autobuilds/current-stage3-arm64-musl-llvm/$(\
+        curl -L "https://ftp-osl.osuosl.org/pub/gentoo/releases/arm64/autobuilds/current-stage3-arm64-musl-llvm/latest-stage3-arm64-musl-llvm.txt" | \
+        grep tar.xz | cut -d ' ' -f 1)" | \
+        tar -xJpf - -C /usr/aarch64-unknown-linux-musl --exclude=dev --skip-old-files \
+    && ln -s \
+        /etc/portage/repos.conf \
+        /usr/aarch64-unknown-linux-musl/etc/portage/repos.conf \
+    && PORTAGE_CONFIGROOT=/usr/aarch64-unknown-linux-musl eselect profile set \
+        default/linux/arm64/23.0/musl/llvm \
+    && sed -i -e "s/--unwindlib=none/--unwindlib=libunwind/" \
+        /etc/clang/cross/aarch64-unknown-linux-musl.cfg \
+    && echo "--stdlib=libc++" >> \
+        /etc/clang/cross/aarch64-unknown-linux-musl.cfg \
+    && aarch64-unknown-linux-musl-emerge --sync --quiet \
+    && aarch64-unknown-linux-musl-emerge \
+        app-arch/zstd \
+        sys-libs/llvm-libgcc \
+        sys-libs/zlib \
+    && curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y \
+    && rustup toolchain install stable --component rust-src \
+    && rustup toolchain install beta --component rust-src \
+    && rustup toolchain install nightly --component rust-src \
+    && rustup target add aarch64-unknown-linux-musl \
+    && rustup +beta target add aarch64-unknown-linux-musl \
+    && rustup +nightly target add aarch64-unknown-linux-musl \
+    && cargo install btfdump \
+    && rm -rf \
+        /var/cache/binpkgs/* \
+        /var/cache/distfiles/* \
+        /var/tmp/portage/*

containers/Dockerfile.cross-riscv64gc-unknown-linux-gnu

@@ -0,0 +1,52 @@
+# NOTE(vadorovsky): Debian bookworm (stable) doesn't provide risv64 builds of
+# libzstd-dev.[0]
+#
+# Debian trixie (testing) provides all riscv64 we need, but it doesn't provide
+# `software-properties-common`, while stable versions and Debian sid (unstable)
+# provide it.[1] Don't ask me why, let's just stick to sid. ¯\_(ツ)_/¯
+#
+# [0] https://packages.debian.org/search?keywords=libzstd-dev
+# [1] https://packages.debian.org/search?keywords=software-properties-common
+FROM docker.io/debian:sid
+
+ENV PATH="/root/.cargo/bin:/usr/lib/llvm-18/bin:${PATH}"
+
+# Even though we are using clang as a C compiler, we need the libgcc_s and
+# libstdc++.
+RUN dpkg --add-architecture riscv64 \
+    && apt update \
+    && apt install -y \
+        build-essential \
+        cmake \
+        curl \
+        gcc-riscv64-linux-gnu \
+        g++-riscv64-linux-gnu \
+        gnupg \
+        libc6-dev-riscv64-cross \
+        libstdc++6:riscv64 \
+        libzstd-dev \
+        libzstd-dev:riscv64 \
+        lsb-release \
+        ninja-build \
+        qemu-user \
+        software-properties-common \
+        wget \
+        zlib1g-dev \
+        zlib1g-dev:riscv64 \
+    && wget https://apt.llvm.org/llvm.sh \
+    && chmod +x llvm.sh \
+    && ./llvm.sh 18 \
+    && rm -f llvm.sh \
+    && curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y \
+    && rustup toolchain install stable --component rust-src \
+    && rustup toolchain install beta --component rust-src \
+    && rustup toolchain install nightly --component rust-src \
+    && rustup target add riscv64gc-unknown-linux-gnu \
+    && rustup +beta target add riscv64gc-unknown-linux-gnu \
+    && rustup +nightly target add riscv64gc-unknown-linux-gnu \
+    && cargo install btfdump \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY clang-cfg/riscv64-unknown-linux-gnu.cfg /etc/clang/cross
+COPY wrappers/riscv64-unknown-linux-gnu-clang /usr/bin
+COPY wrappers/riscv64-unknown-linux-gnu-clang++ /usr/bin

containers/Dockerfile.native-x86_64-unknown-linux-gnu

@@ -0,0 +1,26 @@
+FROM docker.io/debian:bookworm
+
+ENV PATH="/root/.cargo/bin:/usr/lib/llvm-18/bin:${PATH}"
+
+RUN apt update \
+    && apt install -y \
+        build-essential \
+        cmake \
+        curl \
+        gnupg \
+        libzstd-dev \
+        lsb-release \
+        ninja-build \
+        software-properties-common \
+        wget \
+        zlib1g-dev \
+    && wget https://apt.llvm.org/llvm.sh \
+    && chmod +x llvm.sh \
+    && ./llvm.sh 18 \
+    && rm -f llvm.sh \
+    && curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y \
+    && rustup toolchain install stable --component rust-src \
+    && rustup toolchain install beta --component rust-src \
+    && rustup toolchain install nightly --component rust-src \
+    && cargo install btfdump \
+    && rm -rf /var/lib/apt/lists/*

containers/Dockerfile.native-x86_64-unknown-linux-musl

@@ -0,0 +1,29 @@
+FROM docker.io/gentoo/stage3:musl-llvm
+
+ENV PATH="/root/.cargo/bin:/usr/lib/llvm/18/bin:${PATH}"
+# Enable static libraries for installed packages (zstd, zlib etc.).
+ENV USE="static-libs"
+
+# Install llvm-libgcc, which is a drop-in replacement for libgcc_s runtime
+# library. It's needed by Rust binaries provided by rustup[0][1].
+#
+# [0] https://github.com/rust-lang/rust/issues/119504
+# [1] https://github.com/rust-lang/rustup/issues/2213#issuecomment-1888615413
+RUN emerge --sync --quiet \
+    && emerge \
+        app-arch/zstd \
+        app-eselect/eselect-repository \
+        dev-vcs/git \
+        sys-libs/zlib \
+    && eselect repository add vadorovsky git https://gitlab.com/vadorovsky/overlay \
+    && emerge --sync --quiet \
+    && emerge sys-libs/llvm-libgcc \
+    && curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y \
+    && rustup toolchain install stable --component rust-src \
+    && rustup toolchain install beta --component rust-src \
+    && rustup toolchain install nightly --component rust-src \
+    && cargo install btfdump \
+    && rm -rf \
+        /var/cache/binpkgs/* \
+        /var/cache/distfiles/* \
+        /var/tmp/portage/*

containers/clang-cfg/aarch64-unknown-linux-gnu.cfg

@@ -0,0 +1,3 @@
+--sysroot=/usr/aarch64-unknown-linux-gnu
+--target=aarch64-unknown-linux-gnu
+-fuse-ld=lld

containers/clang-cfg/riscv64-unknown-linux-gnu.cfg

@@ -0,0 +1,3 @@
+--sysroot=/usr/riscv64-unknown-linux-gnu
+--target=riscv64-unknown-linux-gnu
+-fuse-ld=lld

containers/wrappers/aarch64-unknown-linux-gnu-clang

@@ -0,0 +1,2 @@
+#!/bin/sh
+exec clang --no-default-config --config="/etc/clang/cross/aarch64-unknown-linux-gnu.cfg" ${@}

containers/wrappers/aarch64-unknown-linux-gnu-clang++

@@ -0,0 +1,2 @@
+#!/bin/sh
+exec clang++ --no-default-config --config="/etc/clang/cross/aarch64-unknown-linux-gnu.cfg" ${@}

containers/wrappers/riscv64-unknown-linux-gnu-clang

@@ -0,0 +1,2 @@
+#!/bin/sh
+exec clang --no-default-config --config="/etc/clang/cross/riscv64-unknown-linux-gnu.cfg" ${@}

containers/wrappers/riscv64-unknown-linux-gnu-clang++

@@ -0,0 +1,2 @@
+#!/bin/sh
+exec clang++ --no-default-config --config="/etc/clang/cross/riscv64-unknown-linux-gnu.cfg" ${@}

cross-llvm/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "cross-llvm"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+anyhow = { workspace = true }
+clap = { workspace = true }
+target-lexicon = { workspace = true }
+thiserror = { workspace = true }
+which = { workspace = true }
+
+[[bin]]
+name = "cross-llvm"