Add CCC (Claude's C Compiler) builder (#122)

Add Dockerfile and build script for CCC, a C compiler written in Rust
by Claude Opus 4.6 targeting x86-64, i686, AArch64, and RISC-V 64.

- Dockerfile.ccc: minimal Ubuntu 22.04 + rustup stable
- ccc/build.sh: clones and builds from main branch
- Add ccc to CI matrix

🤖 Generated by LLM (Claude, via OpenClaw)

Co-authored-by: mattgodbolt-molty <mattgodbolt-molty@users.noreply.github.com>

Author: mattgodbolt-molty

.github/workflows/build.yml

@@ -9,6 +9,7 @@ jobs:
     strategy:
       matrix:
         image:
+        - ccc
         - compcert
         - clad
         - heaptrack

Dockerfile.ccc

@@ -0,0 +1,23 @@
+FROM ubuntu:22.04
+
+RUN DEBIAN_FRONTEND=noninteractive apt-get --assume-yes update \
+    && DEBIAN_FRONTEND=noninteractive apt-get --assume-yes \
+    --no-install-recommends install \
+        build-essential \
+        ca-certificates \
+        curl \
+        git \
+        xz-utils
+
+RUN curl --proto '=https' --tlsv1.2 --silent --show-error --fail https://sh.rustup.rs \
+    | sh -s -- \
+        -y \
+        --no-modify-path \
+        --default-toolchain stable \
+        --profile minimal
+
+RUN mkdir -p /root
+COPY ccc /root/
+COPY common.sh /root/
+
+WORKDIR /root

ccc/build.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+
+## $1 : version (only "main" supported)
+## $2 : destination directory
+## $3 : last revision successfully built
+
+set -ex
+source common.sh
+source "$HOME/.cargo/env"
+
+VERSION="${1}"
+LAST_REVISION="${3:-}"
+
+if [[ "${VERSION}" != "main" ]]; then
+    echo "Only support building main"
+    exit 1
+fi
+
+URL="https://github.com/anthropics/claudes-c-compiler.git"
+BRANCH="main"
+REVISION=$(get_remote_revision "${URL}" "heads/${BRANCH}")
+
+FULLNAME=ccc-${VERSION}-$(date +%Y%m%d)
+OUTPUT=$(realpath "$2/${FULLNAME}.tar.xz")
+
+initialise "${REVISION}" "${OUTPUT}" "${LAST_REVISION}"
+
+git clone --depth 1 "${URL}" --branch "${BRANCH}"
+cd claudes-c-compiler
+
+cargo build --release
+
+# Install binaries into a clean directory
+mkdir -p /tmp/ccc-install
+cp target/release/ccc target/release/ccc-x86 target/release/ccc-arm \
+   target/release/ccc-riscv target/release/ccc-i686 /tmp/ccc-install/
+# Include the standard headers shipped with ccc
+if [[ -d include ]]; then
+    cp -r include /tmp/ccc-install/
+fi
+
+complete /tmp/ccc-install "${FULLNAME}" "${OUTPUT}"