Extend clang-cross to support alpine

native/linux-clang-cross/build.cake

@@ -7,15 +7,20 @@ if (BUILD_ARCH.Length == 0)
 
 string GetGnArgs(string arch)
 {
+    var (vendor, abi, sysrootarg, linker) = BUILD_VARIANT switch
+    {
+        "alpine" => ("-alpine", "musl", "'--sysroot=/alpine', ", "'-fuse-ld=lld'"),
+        _ => ("", "gnu", "", ""),
+    };
     var (toolchainArch, targetArch) = arch switch
     {
-        "arm" => ("arm-linux-gnueabihf", "armv7a-linux-gnueabihf"),
-        "arm64" => ("aarch64-linux-gnu", "aarch64-linux-gnu"),
-        _ => ($"{arch}-linux-gnu", $"{arch}-linux-gnu"),
+        "arm" => ($"arm{vendor}-linux-{abi}eabihf", $"armv7a{vendor}-linux-{abi}eabihf"),
+        "arm64" => ($"aarch64{vendor}-linux-{abi}", $"aarch64{vendor}-linux-{abi}"),
+        _ => ($"{arch}{vendor}-linux-{abi}", $"{arch}{vendor}-linux-{abi}"),
     };
 
     var sysroot = $"/usr/{toolchainArch}";
-    var init = $"'--target={targetArch}'";
+    var init = $"{sysrootarg} '--target={targetArch}'";
     var bin = $"'-B{sysroot}/bin/' ";
     var libs = $"'-L{sysroot}/lib/' ";
     var includes = 
@@ -26,7 +31,7 @@ string GetGnArgs(string arch)
     return
         $"extra_asmflags+=[ {init}, '-no-integrated-as', {bin}, {includes} ] " +
         $"extra_cflags+=[ {init}, {bin}, {includes} ] " +
-        $"extra_ldflags+=[ {init}, {bin}, {libs} ] " +
+        $"extra_ldflags+=[ {init}, {bin}, {libs}, {linker} ] " +
         ADDITIONAL_GN_ARGS;
 }
 
@@ -38,6 +43,7 @@ Task("libSkiaSharp")
         RunCake("../linux/build.cake", "libSkiaSharp", new Dictionary<string, string> {
             { "arch", arch },
             { "gnArgs", GetGnArgs(arch) },
+            { "variant", BUILD_VARIANT },
         });
     }
 });
@@ -50,6 +56,7 @@ Task("libHarfBuzzSharp")
         RunCake("../linux/build.cake", "libHarfBuzzSharp", new Dictionary<string, string> {
             { "arch", arch },
             { "gnArgs", GetGnArgs(arch) },
+            { "variant", BUILD_VARIANT },
         });
     }
 });

scripts/Docker/_clang-cross-common.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+set -ex
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+DOCKER_DIR="$1"
+
+# the target architecture to build for
+ARCH="${2:-arm}"
+
+# the docker image architecture to use
+MACHINE_ARCH="$(uname -m)"
+IMAGE_ARCH="${3:-$([[ "$MACHINE_ARCH" == "arm64" || "$MACHINE_ARCH" == "aarch64" ]] && echo "arm64v8" || echo "amd64")}"
+
+DISTRO_VERSION=$4
+ABI=$5
+VENDOR=$6
+
+case $ARCH in
+  arm)     TOOLCHAIN_ARCH=arm$VENDOR-linux-${ABI}eabihf; TOOLCHAIN_ARCH_SHORT=armhf ;;
+  arm64)   TOOLCHAIN_ARCH=aarch64$VENDOR-linux-$ABI; TOOLCHAIN_ARCH_SHORT=arm64     ;;
+  riscv64) TOOLCHAIN_ARCH=riscv64$VENDOR-linux-$ABI; TOOLCHAIN_ARCH_SHORT=riscv64   ;;
+  x86)     TOOLCHAIN_ARCH=i686$VENDOR-linux-$ABI; TOOLCHAIN_ARCH_SHORT=i386         ;;
+  x64)     TOOLCHAIN_ARCH=x86-64$VENDOR-linux-$ABI; TOOLCHAIN_ARCH_SHORT=amd64      ;;
+  *) echo "Unsupported architecture: $ARCH" && exit 1 ;;
+esac
+
+(cd $DIR && docker build --tag skiasharp-linux-$ABI-cross-$ARCH \
+    --build-arg TOOLCHAIN_ARCH=$TOOLCHAIN_ARCH \
+    --build-arg TOOLCHAIN_ARCH_SHORT=$TOOLCHAIN_ARCH_SHORT \
+    --build-arg IMAGE_ARCH=$IMAGE_ARCH \
+    --build-arg MACHINE_ARCH=$MACHINE_ARCH \
+    --build-arg DISTRO_VERSION=$DISTRO_VERSION \
+    $DOCKER_DIR)
+
+if [ "$VENDOR" = "-alpine" ]; then vendor=alpine; fi
+
+(cd $DIR/../.. && 
+    docker run --rm --name skiasharp-linux-$ABI-cross-$ARCH --volume $(pwd):/work skiasharp-linux-$ABI-cross-$ARCH /bin/bash -c "\
+        dotnet tool restore ; \
+        dotnet cake --target=externals-linux-clang-cross --configuration=Release --buildarch=$ARCH --variant=$vendor")

scripts/Docker/alpine/clang-cross/.dockerignore

@@ -0,0 +1 @@
+build-local.sh

scripts/Docker/alpine/clang-cross/Dockerfile

@@ -0,0 +1,47 @@
+# Arguments:
+#   IMAGE_ARCH           - the architecture of the image                    [ amd64 | arm64v8 | riscv64 ]
+#   DOTNET_SDK_VERSION   - the version of dotnet for the Cake script        [ 8.0 | * ]
+#   TOOLCHAIN_VERSION    - the version of the GCC toolchain                 [ 9 | * ]
+#   TOOLCHAIN_ARCH       - the architecture of the GCC toolchain            [ arm-alpine-linux-musleabihf | aarch64-alpine-linux-musl | riscv64-alpine-linux-musl ]
+#   TOOLCHAIN_ARCH_SHORT - the short form architecture of the GCC toolchain [ armhf | arm64 ]
+#   FONTCONFIG_VERSION   - the exact version of libfontconfig1 to use       [ 2.13.1-2 | * ]
+
+ARG IMAGE_ARCH=amd64
+FROM ${IMAGE_ARCH}/debian:12
+
+# Install the required packages
+RUN apt-get update \
+    && apt-get install -y \
+        curl python3 git clang-19 lld-19 ninja-build xz-utils curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install the cross-compilation musl toolchain
+ARG DISTRO_VERSION=3.17
+ARG TOOLCHAIN_ARCH_SHORT=armhf
+ARG MACHINE_ARCH=x86_64
+RUN APK_DIR="$(mktemp -d)" && \
+    curl -SLO --create-dirs --output-dir "$APK_DIR" "https://gitlab.alpinelinux.org/api/v4/projects/5/packages/generic/v2.12.11/$MACHINE_ARCH/apk.static" && \
+    chmod +x "$APK_DIR/apk.static" && \
+    "$APK_DIR/apk.static" \
+        -X "http://dl-cdn.alpinelinux.org/alpine/v$DISTRO_VERSION/main" \
+        -X "http://dl-cdn.alpinelinux.org/alpine/v$DISTRO_VERSION/community" \
+        -U --allow-untrusted --root /alpine --arch "$TOOLCHAIN_ARCH_SHORT" --initdb add && \
+    "$APK_DIR/apk.static" \
+        -X "http://dl-cdn.alpinelinux.org/alpine/v$DISTRO_VERSION/main" \
+        -X "http://dl-cdn.alpinelinux.org/alpine/v$DISTRO_VERSION/community" \
+        -U --allow-untrusted --root /alpine --arch "$TOOLCHAIN_ARCH_SHORT" --no-scripts \
+        add fontconfig-dev build-base
+
+# Install the .NET SDK
+ARG DOTNET_SDK_VERSION=8.0
+ENV DOTNET_SYSTEM_GLOBALIZATION_INVARIANT 1
+RUN curl https://dot.net/v1/dotnet-install.sh -L -o dotnet-install.sh \
+    && bash dotnet-install.sh --channel ${DOTNET_SDK_VERSION} --install-dir /usr/share/dotnet --verbose \
+    && ln -s /usr/share/dotnet/dotnet /usr/bin/dotnet \
+    && rm dotnet-install.sh \
+    && dotnet help \
+    && dotnet --info
+
+ENV CC=clang-19 CXX=clang++-19
+
+WORKDIR /work

scripts/Docker/alpine/clang-cross/build-local.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -ex
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+
+ARCH=$1
+ALPINE_VERSION=$3
+if [ -z "$ALPINE_VERSION" ]; then
+  case $ARCH in
+    riscv64) ALPINE_VERSION=3.20 ;;
+    *) ALPINE_VERSION=3.17       ;;
+  esac
+fi
+
+$DIR/../../_clang-cross-common.sh "$DIR" "$ARCH" "$2" "$ALPINE_VERSION" "musl" "-alpine"

scripts/Docker/debian/clang-cross/build-local.sh

@@ -3,24 +3,13 @@ set -ex
 
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 
-# the target architecture to build for
-ARCH="${1:-arm}"
-case $ARCH in
-  arm)     BUILD_ARGS="--build-arg TOOLCHAIN_ARCH=arm-linux-gnueabihf --build-arg TOOLCHAIN_ARCH_SHORT=armhf"   ;;
-  arm64)   BUILD_ARGS="--build-arg TOOLCHAIN_ARCH=aarch64-linux-gnu   --build-arg TOOLCHAIN_ARCH_SHORT=arm64"   ;;
-  riscv64) BUILD_ARGS="--build-arg TOOLCHAIN_ARCH=riscv64-linux-gnu   --build-arg TOOLCHAIN_ARCH_SHORT=riscv64" ;;
-  x86)     BUILD_ARGS="--build-arg TOOLCHAIN_ARCH=i686-linux-gnu      --build-arg TOOLCHAIN_ARCH_SHORT=i386"    ;;
-  x64)     BUILD_ARGS="--build-arg TOOLCHAIN_ARCH=x86-64-linux-gnu    --build-arg TOOLCHAIN_ARCH_SHORT=amd64"   ;;
-  *) echo "Unsupported architecture: $ARCH" && exit 1 ;;
-esac
-
-# the docker image architecture to use
-IMAGE_ARCH="${2:-$([[ "$(uname -m)" == "arm64" ]] && echo "arm64v8" || echo "amd64")}"
-
-DEBIAN_VERSION=${3:-11}
-
-(cd $DIR && docker build --tag skiasharp-linux-cross-$ARCH $BUILD_ARGS --build-arg IMAGE_ARCH=$IMAGE_ARCH $DEBIAN_VERSION)
-(cd $DIR/../../../../ && 
-    docker run --rm --name skiasharp-linux-cross-$ARCH --volume $(pwd):/work skiasharp-linux-cross-$ARCH /bin/bash -c "\
-        dotnet tool restore ; \
-        dotnet cake --target=externals-linux-clang-cross --configuration=Release --buildarch=$ARCH")
+ARCH=$1
+DEBIAN_VERSION=$3
+if [ -z "$DEBIAN_VERSION" ]; then
+  case $ARCH in
+    riscv64) DEBIAN_VERSION=12 ;;
+    *) DEBIAN_VERSION=11       ;;
+  esac
+fi
+
+$DIR/../../_clang-cross-common.sh "$DIR/$DEBIAN_VERSION" "$ARCH" "$2" "$DEBIAN_VERSION" "gnu"

scripts/azure-templates-stages.yml

@@ -376,6 +376,14 @@ stages:
                 docker: scripts/Docker/debian/clang-cross/12
                 dockerArgs: --build-arg TOOLCHAIN_ARCH=riscv64-linux-gnu --build-arg TOOLCHAIN_ARCH_SHORT=riscv64
                 target: externals-linux-clang-cross
+              - arch: arm64
+                docker: scripts/Docker/alpine/clang-cross
+                dockerArgs: --build-arg TOOLCHAIN_ARCH=aarch64-alpine-linux-musl --build-arg TOOLCHAIN_ARCH_SHORT=arm64
+                target: externals-linux-clang-cross
+              - arch: riscv64
+                docker: scripts/Docker/alpine/clang-cross
+                dockerArgs: --build-arg TOOLCHAIN_ARCH=riscv64-alpine-linux-musl --build-arg TOOLCHAIN_ARCH_SHORT=riscv64
+                target: externals-linux-clang-cross
         - template: /scripts/azure-templates-bootstrapper.yml@self # Build Native Tizen (Linux)
           parameters:
             name: native_tizen_linux
@@ -518,10 +526,14 @@ stages:
               # tvOS
               - name: native_tvos_macos
               # Linux
+              - name: native_linux_arm64_alpine_linux
+              - name: native_linux_arm64_alpine_nodeps_linux
               - name: native_linux_arm64_linux
               - name: native_linux_arm64_nodeps_linux
               - name: native_linux_arm_linux
               - name: native_linux_arm_nodeps_linux
+              - name: native_linux_riscv64_alpine_linux
+              - name: native_linux_riscv64_alpine_nodeps_linux
               - name: native_linux_riscv64_linux
               - name: native_linux_riscv64_nodeps_linux
               - name: native_linux_x64_alpine_linux
@@ -561,8 +573,12 @@ stages:
               # Linux
               - name: native_linux_arm64_linux
               - name: native_linux_arm64_nodeps_linux
+              - name: native_linux_arm64_alpine_linux
+              - name: native_linux_arm64_alpine_nodeps_linux
               - name: native_linux_arm_linux
               - name: native_linux_arm_nodeps_linux
+              - name: native_linux_riscv64_alpine_linux
+              - name: native_linux_riscv64_alpine_nodeps_linux
               - name: native_linux_riscv64_linux
               - name: native_linux_riscv64_nodeps_linux
               - name: native_linux_x64_alpine_linux