Test statically linked clang outside of Alpine Linux

.github/workflows/llvm-project-epoch-one.yml

@@ -24,7 +24,13 @@ jobs:
         with:
           context: ./llvm-project
           file: ./llvm-project/Dockerfile.epoch1
+          load: true
           platforms: linux/amd64
-          push: ${{ github.repository_owner == 'ClangBuiltLinux' && github.event_name != 'pull_request' && github.ref_name == 'main' }}
           tags: |
             ghcr.io/clangbuiltlinux/llvm-project:stage2
+      - name: Test statically linked clang
+        run: bash ci/test-clang.sh
+      - name: Push image to ghcr.io
+        if: ${{ github.repository_owner == 'ClangBuiltLinux' && github.event_name != 'pull_request' && github.ref_name == 'main' }}
+        run: |
+          docker push ghcr.io/clangbuiltlinux/llvm-project:stage2

.github/workflows/llvm-project-epoch-two.yml

@@ -24,7 +24,13 @@ jobs:
         with:
           context: ./llvm-project
           file: ./llvm-project/Dockerfile.epoch2
+          load: true
           platforms: linux/amd64
-          push: ${{ github.repository_owner == 'ClangBuiltLinux' && github.event_name != 'pull_request' && github.ref_name == 'main' }}
           tags: |
             ghcr.io/clangbuiltlinux/llvm-project:stage2
+      - name: Test statically linked clang
+        run: bash ci/test-clang.sh
+      - name: Push image to ghcr.io
+        if: ${{ github.repository_owner == 'ClangBuiltLinux' && github.event_name != 'pull_request' && github.ref_name == 'main' }}
+        run: |
+          docker push ghcr.io/clangbuiltlinux/llvm-project:stage2

ci/test-clang-docker.sh

@@ -0,0 +1,70 @@
+#!/usr/bin/env bash
+
+set -eu
+
+if [[ ! -d /repo ]]; then
+    echo "[-] This script needs to be run within Docker! Use test-clang.sh instead."
+    exit 1
+fi
+
+CC=/repo/toolchain/bin/clang
+CXX=/repo/toolchain/bin/clang++
+hello_c=/repo/llvm-project/hello.c
+hello_cpp=/repo/llvm-project/hello.cpp
+hello_exe=/tmp/hello
+host_arch=$(uname -m)
+
+# Print clang information, which makes sure it can run
+echo "[+] Testing 'clang --version'"
+"$CC" --version
+
+case "$(source /usr/lib/os-release; echo "$ID")" in
+    arch)
+        musl_cc_flags=(--sysroot=/usr/lib/musl)
+
+        echo "[+] Updating OS and installing musl"
+        pacman -Syyu --noconfirm musl
+        ;;
+
+    fedora)
+        musl_cc_flags=(
+            -B /usr/"$host_arch"-linux-musl/lib64   # Scrt1.o, crti.o, crtn.o
+            -I /usr/"$host_arch"-linux-musl/include # stdio.h
+            -L /usr/"$host_arch"-linux-musl/lib64   # -lc
+        )
+
+        echo "[+] Updating OS"
+        dnf update -qy
+
+        echo "[+] Installing musl"
+        dnf install -qy \
+            musl-devel \
+            musl-libc \
+            musl-libc-static
+        ;;
+esac
+
+########
+# MUSL #
+########
+
+echo "[+] Testing dynamically linking hello.c against musl"
+"$CC" "${musl_cc_flags[@]}" -o "$hello_exe" "$hello_c"
+"$hello_exe"
+
+echo "[+] Testing statically linking hello.c against musl"
+"$CC" "${musl_cc_flags[@]}" -static -o "$hello_exe" "$hello_c"
+"$hello_exe"
+
+echo "[+] Testing dynamically linking hello.cpp against musl ('--rpath')"
+# --rpath to avoid having to pull in libc++ and libunwind from distribution
+"$CXX" "${musl_cc_flags[@]}" -Wl,--rpath=/repo/toolchain/lib/"$host_arch"-alpine-linux-musl -o "$hello_exe" "$hello_cpp"
+"$hello_exe"
+
+echo "[+] Testing dynamically linking hello.cpp against musl ('LD_LIBRARY_PATH')"
+"$CXX" "${musl_cc_flags[@]}" -o "$hello_exe" "$hello_cpp"
+LD_LIBRARY_PATH=/lib:/repo/toolchain/lib/"$host_arch"-alpine-linux-musl "$hello_exe"
+
+echo "[+] Testing statically linking hello.cpp against musl"
+"$CXX" "${musl_cc_flags[@]}" -static -lc++abi -o "$hello_exe" "$hello_cpp"
+"$hello_exe"

ci/test-clang.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+set -eu
+
+trap 'rm -fr "$toolchain"' EXIT
+
+# Set up workspace
+rootdir=${GITHUB_WORKSPACE:-$(dirname "$(dirname "$(realpath "$0")")")}
+toolchain=$rootdir/toolchain
+
+# Pull toolchain out of container
+echo "[+] Downloading toolchain from container"
+docker create --name llvm-project ghcr.io/clangbuiltlinux/llvm-project:stage2
+mkdir "$toolchain"
+docker cp llvm-project:/usr/local/bin "$toolchain"
+docker cp llvm-project:/usr/local/include "$toolchain"
+docker cp llvm-project:/usr/local/lib "$toolchain"
+echo "[+] Cleaning up container"
+docker rm llvm-project
+
+# Test toolchain in Docker images so that the environment is consistent,
+# regardless of runners.
+docker_images=(
+    docker.io/fedora:latest
+)
+# Arch Linux is an x86_64-only distribution
+[[ $(uname -m) = "x86_64" ]] && docker_images+=(docker.io/archlinux:latest)
+for docker_image in "${docker_images[@]}"; do
+    echo "[+] Updating '$docker_image'"
+    docker pull "$docker_image"
+    echo "[+] Testing clang in '$docker_image' container"
+    docker run \
+        --rm \
+        --volume "$rootdir":/repo:ro \
+        "$docker_image" \
+        bash /repo/ci/test-clang-docker.sh
+done