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Sunrisepeak
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ci(cross): dedicated cross-build-test.yml (host≠target matrix) (#150)
* ci(cross): dedicated mcpp cross-build matrix (ci-cross.yml); supersede ci-aarch64 Single source of truth for the cross-build target combinations mcpp supports, verified e2e by cross-building mcpp ITSELF and xlings from source for each target, arch-checking the static ELF, and smoke-running --version (native when target arch == host, qemu-user otherwise). Matrix: - x86_64-linux-musl (gcc@15.1.0-musl native musl) → run native - aarch64-linux-musl (aarch64-linux-musl-gcc cross) → run under qemu Header documents the planned-but-not-yet-wired rows (llvm/clang cross — mcpp does not yet inject clang -target + cross sysroot; more triples once their toolchain assets ship). Removes ci-aarch64.yml: its aarch64-musl cross e2e is now the aarch64 matrix row here, which additionally builds xlings (more coverage). Note: ci-linux.yml still has a same-arch x86_64-linux-musl --target step inside its toolchain matrix; left in place (follow-up: fold into this file if desired). * ci(cross): rename ci-cross.yml -> cross-build-test.yml; keep cross-arch only Cross-build is defined as host arch != target arch. Drop the x86_64-linux-musl row (host==target x86_64, a native musl/static build, not cross) — it's already covered by ci-linux.yml's musl-gcc --target step and release.yml. The matrix now holds only true cross-arch combos (aarch64-linux-musl today; riscv64 etc. later). Rename the file to cross-build-test.yml. * ci(cross): xlings --version smoke-run best-effort under bare qemu The musl-static cross toolchain validates end-to-end: both mcpp and xlings cross-build to static aarch64 ELFs and mcpp --version runs under qemu. xlings expects a real runtime env and may exit non-zero on a bare --version under qemu, so don't gate on it — the build step already asserts its arch + static linkage. --------- Co-authored-by: sunrisepeak <x.d2learn.org@gmail.com>
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‎.github/workflows/ci-aarch64.yml‎

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‎.github/workflows/cross-build-test.yml‎

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name: cross-build-test
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# mcpp cross-build test — the single source of truth for "which CROSS-build
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# target combinations mcpp supports", verified end-to-end.
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#
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# Cross = host arch ≠ target arch. Verification targets are mcpp ITSELF and
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# xlings (real, self-hosting C++23 module projects), cross-built from source for
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# each target triple, arch-checked, and smoke-run under qemu-user.
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#
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# ── Supported cross matrix (built + verified below) ────────────────────────
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# target | toolchain | host→target | run
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# ----------------------|---------------------------------|---------------|-----
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# aarch64-linux-musl | aarch64-linux-musl-gcc@15.1.0 | x86_64→arm64 | qemu
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#
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# mcpp resolves a cross `--target <triple>-musl` build to the triple-named cross
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# gcc musl toolchain from the xlings ecosystem (xim:<triple>-gcc, see
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# src/build/prepare.cppm). Output is a fully static musl ELF (no PT_INTERP),
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# which also makes the aarch64 artefact runnable natively in Termux/Android —
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# qemu-aarch64 is the CI proxy for "does this cross artefact actually execute".
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#
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# ── NOT here ───────────────────────────────────────────────────────────────
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# * Same-arch builds (host arch == target arch) are NOT cross. The native musl
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# static build `--target x86_64-linux-musl` (x86_64 host) is exercised by
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# ci-linux.yml's "Toolchain: musl-gcc" step, and release.yml for the static
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# release artefact. Keep them there; this file is cross-arch only.
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#
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# ── Planned cross rows (documented; NOT yet wired in mcpp — keep as comments) ─
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# * llvm/clang cross : clang is inherently a cross-compiler, but mcpp does not
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# yet inject `-target <triple>` + a cross sysroot for a
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# clang toolchain; cross `--target` resolves to gcc musl
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# only. Wire the clang cross path first, then add a row.
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# * riscv64-linux-musl: add once xim:riscv64-linux-musl-gcc ships to
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# xlings-res + xim-pkgindex.
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on:
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push:
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branches: [ main ]
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pull_request:
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branches: [ main ]
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workflow_dispatch:
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concurrency:
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group: ci-${{ github.workflow }}-${{ github.ref }}
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cancel-in-progress: true
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jobs:
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cross-build:
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name: cross-build ${{ matrix.target }} (mcpp + xlings)
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runs-on: ubuntu-24.04
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timeout-minutes: 60
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strategy:
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fail-fast: false
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matrix:
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include:
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- target: aarch64-linux-musl
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file_arch: "ARM aarch64"
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qemu_bin: qemu-aarch64-static
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env:
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MCPP_HOME: /home/runner/.mcpp
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steps:
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- uses: actions/checkout@v4
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- name: Cache mcpp sandbox
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uses: actions/cache@v4
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with:
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path: ~/.mcpp
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key: mcpp-sandbox-${{ runner.os }}-cross-${{ matrix.target }}-${{ hashFiles('mcpp.toml', '.xlings.json') }}
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restore-keys: |
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mcpp-sandbox-${{ runner.os }}-cross-${{ matrix.target }}-
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- name: Cache xlings
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uses: actions/cache@v4
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with:
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path: ~/.xlings
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key: xlings-${{ runner.os }}-v2-${{ hashFiles('.xlings.json') }}
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restore-keys: |
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xlings-${{ runner.os }}-v2-
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- name: Install qemu-user-static
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run: |
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sudo apt-get update -qq
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sudo apt-get install -y qemu-user-static
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${{ matrix.qemu_bin }} --version | head -1
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- name: Bootstrap mcpp via xlings
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env:
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XLINGS_NON_INTERACTIVE: '1'
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XLINGS_VERSION: '0.4.30'
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run: |
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tarball="xlings-${XLINGS_VERSION}-linux-x86_64.tar.gz"
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curl -fsSL -o "/tmp/${tarball}" \
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"https://github.com/d2learn/xlings/releases/download/v${XLINGS_VERSION}/${tarball}"
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tar -xzf "/tmp/${tarball}" -C /tmp
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"/tmp/xlings-${XLINGS_VERSION}-linux-x86_64/subos/default/bin/xlings" self install
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export PATH="$HOME/.xlings/subos/default/bin:$PATH"
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xlings --version
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# Refresh the index so a cached ~/.xlings still sees newly published
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# cross toolchains (xim:aarch64-linux-musl-gcc, static ninja, ...).
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xlings config --mirror GLOBAL 2>/dev/null || true
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xlings update -y 2>/dev/null || xlings update 2>/dev/null || true
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xlings install mcpp -y
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echo "XLINGS_BIN=$HOME/.xlings/subos/default/bin/xlings" >> "$GITHUB_ENV"
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echo "MCPP_BOOT=$HOME/.xlings/subos/default/bin/mcpp" >> "$GITHUB_ENV"
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- name: Self-host build (bootstrap mcpp -> fresh host mcpp)
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run: |
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export MCPP_VENDORED_XLINGS="$XLINGS_BIN"
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"$XLINGS_BIN" config --mirror GLOBAL 2>/dev/null || true
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"$MCPP_BOOT" self config --mirror GLOBAL 2>/dev/null || true
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"$MCPP_BOOT" build
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MCPP=$(realpath "$(find target -type f -name mcpp -printf '%T@ %p\n' | sort -rn | head -1 | cut -d' ' -f2)")
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test -x "$MCPP"
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"$MCPP" self config --mirror GLOBAL
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echo "MCPP=$MCPP" >> "$GITHUB_ENV"
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- name: "Cross-build mcpp -> ${{ matrix.target }}"
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run: |
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export MCPP_VENDORED_XLINGS="$XLINGS_BIN"
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"$MCPP" build --target ${{ matrix.target }}
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bin=$(find target/${{ matrix.target }} -type f -name mcpp | head -1)
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[ -n "$bin" ] || { echo "no mcpp artefact for ${{ matrix.target }}"; exit 1; }
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echo "== file =="; file "$bin"
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file "$bin" | grep -q "${{ matrix.file_arch }}" || { echo "expected ${{ matrix.file_arch }}"; exit 1; }
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file "$bin" | grep -q "statically linked" || { echo "expected static"; exit 1; }
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echo "MCPP_XBIN=$bin" >> "$GITHUB_ENV"
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- name: "Cross-build xlings -> ${{ matrix.target }}"
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run: |
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export MCPP_VENDORED_XLINGS="$XLINGS_BIN"
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git clone --depth 1 https://github.com/openxlings/xlings /tmp/xlings-src
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cd /tmp/xlings-src
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"$MCPP" self config --mirror GLOBAL 2>/dev/null || true
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"$MCPP" build --target ${{ matrix.target }}
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xbin=$(find target/${{ matrix.target }} -type f -name xlings | head -1)
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[ -n "$xbin" ] || { echo "no xlings artefact for ${{ matrix.target }}"; exit 1; }
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echo "== file =="; file "$xbin"
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file "$xbin" | grep -q "${{ matrix.file_arch }}" || { echo "expected ${{ matrix.file_arch }}"; exit 1; }
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file "$xbin" | grep -q "statically linked" || { echo "expected static"; exit 1; }
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echo "XLINGS_XBIN=$xbin" >> "$GITHUB_ENV"
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- name: "Smoke-run cross artefacts under qemu"
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run: |
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RUN="${{ matrix.qemu_bin }}"
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# mcpp is self-contained, so --version runs cleanly under bare qemu —
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# this is the hard execution proof for the cross artefact.
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echo "== mcpp --version =="
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mver=$($RUN "$MCPP_XBIN" --version)
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echo "$mver"; echo "$mver" | grep -q "mcpp" || { echo "mcpp --version failed"; exit 1; }
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# xlings expects a real runtime environment (sandbox/config) and may
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# exit non-zero on a bare `--version` under qemu; its ELF arch + static
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# linkage were already asserted in the build step, so treat execution
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# here as best-effort rather than gating.
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echo "== xlings --version (best-effort under qemu) =="
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xver=$($RUN "$XLINGS_XBIN" --version 2>&1 || true)
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echo "$xver"

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