test (16662d16) · Commits · jan.koester / blogi

packaging/build-nspawn.sh

+105 −107

Original line number	Diff line number	Diff line
		@@ -153,13 +153,11 @@ ensure_kernel_headers() {
		# Phase 2b: Install LLVM toolchain + musl + libc++ + compiler-rt
		# ─────────────────────────────────────────────────────────────
		setup_toolchain() {
		# ── Phase 2b-1: Install LLVM, musl, and runtimes (expensive, skip if done) ──
		if [[ -f "$CHROOT_DIR/usr/local/musl/lib/libc++.a" ]]; then
		echo "==> Toolchain already set up, skipping"
		# Ensure kernel headers are present (may have been missed in earlier runs)
		echo "==> Runtimes already built, skipping LLVM/musl/runtimes build"
		ensure_kernel_headers
		return
		fi

		else
		echo "==> Setting up LLVM ${LLVM_VERSION} + musl + libc++ toolchain..."

		systemd-nspawn -D "$CHROOT_DIR" --pipe -- bash -c "
		@@ -201,8 +199,6 @@ setup_toolchain() {
		systemd-nspawn -D "$CHROOT_DIR" --pipe -- bash -c "
		set -e

		# Build libc++, libc++abi and libunwind against musl from LLVM source
		# LLVM 18 requires the unified runtimes build
		cd /tmp
		LLVM_TAG=llvmorg-${LLVM_VERSION}.1.8
		if [ ! -d /tmp/llvm-project-\${LLVM_TAG} ]; then
		@@ -211,10 +207,7 @@ setup_toolchain() {
		fi
		LLVM_SRC=/tmp/llvm-project-\${LLVM_TAG}

		# Clean stale build to avoid cached failures
		rm -rf /tmp/build-runtimes

		# Unified runtimes build: libunwind + libc++abi + libc++
		mkdir -p /tmp/build-runtimes && cd /tmp/build-runtimes
		cmake \${LLVM_SRC}/runtimes -G Ninja \
		-DCMAKE_C_COMPILER=clang-${LLVM_VERSION} \
		@@ -239,11 +232,17 @@ setup_toolchain() {
		-DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=ON
		ninja
		ninja install
		ninja
		ninja install

		# Create musl-clang wrapper that uses libc++ and compiler-rt
		# Find compiler-rt lib path
		echo '==> Runtimes built and installed'
		"
		fi

		# ── Phase 2b-2: Generate wrapper compilers + toolchain file (always, cheap) ──
		echo "==> Generating compiler wrappers and toolchain file..."

		systemd-nspawn -D "$CHROOT_DIR" --pipe -- bash -c "
		set -e

		RT_PATH=\$(dirname \$(find /usr/lib/llvm-${LLVM_VERSION} -name 'libclang_rt.builtins-x86_64.a' \| head -1))
		CLANG_RESOURCE=\$(clang-${LLVM_VERSION} -print-resource-dir)

		@@ -251,24 +250,24 @@ setup_toolchain() {
		#!/bin/sh
		# Detect if we are compiling (-c) or linking
		LINKING=1
		for arg in "\\\$@"; do
		case "\\\$arg" in
		for arg in \"\\\$@\"; do
		case \"\\\$arg\" in
		-c\|-S\|-E\|-M\|-MM) LINKING=0 ;;
		esac
		done

		COMPILE_FLAGS="--target=x86_64-linux-musl --sysroot=/usr/local/musl -stdlib=libc++ -nostdinc++ -isystem /usr/local/musl/include/c++/v1 -isystem \${CLANG_RESOURCE}/include -isystem /usr/local/musl/include -fPIC"
		COMPILE_FLAGS=\"--target=x86_64-linux-musl --sysroot=/usr/local/musl -stdlib=libc++ -nostdinc++ -isystem /usr/local/musl/include/c++/v1 -isystem \${CLANG_RESOURCE}/include -isystem /usr/local/musl/include -fPIC\"

		if [ "\\\$LINKING" = "1" ]; then
		exec clang++-${LLVM_VERSION} \\\$COMPILE_FLAGS \\
		-fuse-ld=lld \\
		-L/usr/local/musl/lib -L/usr/local/lib -L\${RT_PATH} \\
		--unwindlib=none -nostdlib \\
		-lc++ -lc++abi -lunwind -lc -lclang_rt.builtins-x86_64 \\
		-Wl,-rpath,/usr/local/musl/lib -Wl,-rpath,/usr/local/lib \\
		"\\\$@"
		if [ \"\\\$LINKING\" = \"1\" ]; then
		exec clang++-${LLVM_VERSION} \\\$COMPILE_FLAGS \\\\
		-fuse-ld=lld \\\\
		-L/usr/local/musl/lib -L/usr/local/lib -L\${RT_PATH} \\\\
		--unwindlib=none -nostdlib \\\\
		-lc++ -lc++abi -lunwind -lc -lclang_rt.builtins-x86_64 \\\\
		-Wl,-rpath,/usr/local/musl/lib -Wl,-rpath,/usr/local/lib \\\\
		\"\\\$@\"
		else
		exec clang++-${LLVM_VERSION} \\\$COMPILE_FLAGS "\\\$@"
		exec clang++-${LLVM_VERSION} \\\$COMPILE_FLAGS \"\\\$@\"
		fi
		WRAPPER
		chmod +x /usr/local/musl/bin/musl-clang++
		@@ -277,30 +276,29 @@ WRAPPER
		#!/bin/sh
		# Detect if we are compiling (-c) or linking
		LINKING=1
		for arg in "\\\$@"; do
		case "\\\$arg" in
		for arg in \"\\\$@\"; do
		case \"\\\$arg\" in
		-c\|-S\|-E\|-M\|-MM) LINKING=0 ;;
		esac
		done

		COMPILE_FLAGS="--target=x86_64-linux-musl --sysroot=/usr/local/musl -isystem \${CLANG_RESOURCE}/include -isystem /usr/local/musl/include -fPIC"
		COMPILE_FLAGS=\"--target=x86_64-linux-musl --sysroot=/usr/local/musl -isystem \${CLANG_RESOURCE}/include -isystem /usr/local/musl/include -fPIC\"

		if [ "\\\$LINKING" = "1" ]; then
		exec clang-${LLVM_VERSION} \\\$COMPILE_FLAGS \\
		-fuse-ld=lld \\
		-L/usr/local/musl/lib -L/usr/local/lib -L\${RT_PATH} \\
		-nostdlib -lc -lclang_rt.builtins-x86_64 \\
		-Wl,-rpath,/usr/local/musl/lib -Wl,-rpath,/usr/local/lib \\
		"\\\$@"
		if [ \"\\\$LINKING\" = \"1\" ]; then
		exec clang-${LLVM_VERSION} \\\$COMPILE_FLAGS \\\\
		-fuse-ld=lld \\\\
		-L/usr/local/musl/lib -L/usr/local/lib -L\${RT_PATH} \\\\
		-nostdlib -lc -lclang_rt.builtins-x86_64 \\\\
		-Wl,-rpath,/usr/local/musl/lib -Wl,-rpath,/usr/local/lib \\\\
		\"\\\$@\"
		else
		exec clang-${LLVM_VERSION} \\\$COMPILE_FLAGS "\\\$@"
		exec clang-${LLVM_VERSION} \\\$COMPILE_FLAGS \"\\\$@\"
		fi
		WRAPPER
		chmod +x /usr/local/musl/bin/musl-clang

		# Create CMake toolchain file that uses the wrapper compilers
		# Create CMake toolchain file
		mkdir -p /usr/local/musl/share

		cat > /usr/local/musl/share/musl-llvm-toolchain.cmake << CMAKE
		set(CMAKE_SYSTEM_NAME Linux)
		set(CMAKE_SYSTEM_PROCESSOR x86_64)
		@@ -309,13 +307,13 @@ set(CMAKE_C_COMPILER /usr/local/musl/bin/musl-clang)
		set(CMAKE_CXX_COMPILER /usr/local/musl/bin/musl-clang++)
		set(CMAKE_LINKER /usr/bin/ld.lld-${LLVM_VERSION})

		set(CMAKE_FIND_ROOT_PATH /usr/local/musl /usr/local)
		set(CMAKE_FIND_ROOT_PATH /usr/local/musl /usr/local /usr)
		set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
		set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY BOTH)
		set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE BOTH)
		CMAKE

		echo '==> Toolchain setup complete'
		echo '==> Wrappers and toolchain file generated'
		"
		}