Add linux-loongarch64 images

src/azurelinux/3.0/net10.0/cross/loongarch64-musl/Dockerfile

@@ -0,0 +1,36 @@
+ARG ROOTFS_DIR=/crossrootfs/loongarch64
+
+FROM mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net10.0-crossdeps-builder-amd64 AS builder
+ARG ROOTFS_DIR
+
+RUN /scripts/eng/common/cross/build-rootfs.sh loongarch64 alpineedge --skipunmount
+
+RUN TARGET_TRIPLE="loongarch64-alpine-linux-musl" && \
+    cmake -S llvm-project.src/runtimes -B runtimes \
+        -DCMAKE_BUILD_TYPE=Release \
+        -DCMAKE_ASM_COMPILER=clang \
+        -DCMAKE_C_COMPILER=clang \
+        -DCMAKE_CXX_COMPILER=clang++ \
+        -DCMAKE_ASM_COMPILER_TARGET="$TARGET_TRIPLE" \
+        -DCMAKE_C_COMPILER_TARGET="$TARGET_TRIPLE" \
+        -DCMAKE_CXX_COMPILER_TARGET="$TARGET_TRIPLE" \
+        # We're going to link the static libraries we build here into PIC images, so build the static libraries as PIC.
+        -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
+        -DCMAKE_SYSROOT="$ROOTFS_DIR" \
+        # Specify linker to use for exes directly for CMake toolchain detection
+        -DCMAKE_EXE_LINKER_FLAGS="-fuse-ld=lld" \
+        # Don't search for tools in the sysroot as we're cross-compiling
+        -DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM="NEVER" \
+        -DLLVM_USE_LINKER=lld \
+        -DLLVM_ENABLE_RUNTIMES="libcxx" \
+        -DLIBCXX_ENABLE_SHARED=OFF \
+        -DLIBCXX_HAS_MUSL_LIBC=ON \
+        -DLIBCXX_CXX_ABI=libstdc++ \
+        -DLIBCXX_CXX_ABI_INCLUDE_PATHS="$ROOTFS_DIR/usr/include/c++/14.2.0/;$ROOTFS_DIR/usr/include/c++/14.2.0/$TARGET_TRIPLE" && \
+    cmake --build runtimes -j $(getconf _NPROCESSORS_ONLN) && \
+    cmake --install runtimes --prefix "$ROOTFS_DIR/usr"
+
+FROM mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net10.0-crossdeps-llvm-amd64
+ARG ROOTFS_DIR
+
+COPY --from=builder $ROOTFS_DIR $ROOTFS_DIR

src/azurelinux/3.0/net10.0/cross/loongarch64/Dockerfile

@@ -0,0 +1,57 @@
+ARG ROOTFS_DIR=/crossrootfs/loongarch64
+
+FROM mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net10.0-crossdeps-builder-amd64 AS builder
+ARG ROOTFS_DIR
+
+# Install the latest debootstrap
+RUN tdnf remove -y debootstrap && \
+    curl -fsL -o debootstrap.tar.gz https://deb.debian.org/debian/pool/main/d/debootstrap/debootstrap_1.0.138.tar.gz && \
+    echo "e8e8b72388b6e5ced65d1b5e69ce0b9e13f4813da0c328a52add57ee5f79430a debootstrap.tar.gz" | sha256sum -c - && \
+    tar xzf debootstrap.tar.gz -C / && \
+    ln -s /debootstrap/debootstrap -t /usr/local/bin && \
+    rm -f debootstrap.tar.gz
+
+# temp
+RUN rm -rf /scripts && git clone --depth 1 --single-branch https://github.com/am11/arcade -b patch-14 /scripts
+
+RUN /scripts/eng/common/cross/build-rootfs.sh loongarch64 sid --skipunmount --skipsigcheck
+
+RUN TARGET_TRIPLE="loongarch64-linux-gnu" && \
+    CLANG_MAJOR_VERSION=$(clang --version | grep -oP "(?<=version )\d+") && \
+    cmake -S llvm-project.src/runtimes -B runtimes \
+        -DCMAKE_BUILD_TYPE=Release \
+        -DCMAKE_ASM_COMPILER=clang \
+        -DCMAKE_C_COMPILER=clang \
+        -DCMAKE_CXX_COMPILER=clang++ \
+        -DCMAKE_ASM_COMPILER_TARGET="$TARGET_TRIPLE" \
+        -DCMAKE_C_COMPILER_TARGET="$TARGET_TRIPLE" \
+        -DCMAKE_CXX_COMPILER_TARGET="$TARGET_TRIPLE" \
+        # We're going to link the static libraries we build here into PIC images, so build the static libraries as PIC.
+        -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
+        -DCMAKE_SYSROOT="$ROOTFS_DIR" \
+        # Specify linker to use for exes directly for CMake toolchain detection
+        -DCMAKE_EXE_LINKER_FLAGS="-fuse-ld=lld" \
+        # Don't search for tools in the sysroot as we're cross-compiling
+        -DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM="NEVER" \
+        -DLLVM_USE_LINKER=lld \
+        -DLLVM_ENABLE_RUNTIMES="libcxx;compiler-rt" \
+        -DLIBCXX_ENABLE_SHARED=OFF \
+        -DLIBCXX_CXX_ABI=libstdc++ \
+        -DLIBCXX_CXX_ABI_INCLUDE_PATHS="$ROOTFS_DIR/usr/include/c++/13/;$ROOTFS_DIR/usr/include/$TARGET_TRIPLE" \
+        -DCOMPILER_RT_CXX_LIBRARY="libcxx" \
+        -DCOMPILER_RT_STATIC_CXX_LIBRARY=ON \
+        -DCOMPILER_RT_BUILD_SANITIZERS=OFF \ 
+        -DCOMPILER_RT_BUILD_MEMPROF=OFF \
+        # The libfuzzer build in LLVM doesn't correctly forward the required CMake properties to the "fuzzed libc++" build
+        # so skip it here.
+        -DCOMPILER_RT_BUILD_LIBFUZZER=OFF \
+        -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON \
+        -DCOMPILER_RT_INSTALL_PATH="/usr/local/lib/clang/$CLANG_MAJOR_VERSION" && \
+    cmake --build runtimes -j $(getconf _NPROCESSORS_ONLN) && \
+    cmake --install runtimes --prefix "$ROOTFS_DIR/usr"
+
+FROM mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net10.0-crossdeps-llvm-amd64
+ARG ROOTFS_DIR
+
+COPY --from=builder /usr/local/lib/clang /usr/local/lib/clang/
+COPY --from=builder $ROOTFS_DIR $ROOTFS_DIR

src/azurelinux/manifest.json

@@ -638,7 +638,8 @@
               }
             }
           ]
-        },        {
+        },
+        {
           "platforms": [
             {
               "dockerfile": "src/azurelinux/3.0/net10.0/cross/riscv64-musl",
@@ -650,6 +651,18 @@
             }
           ]
         },
+        {
+          "platforms": [
+            {
+              "dockerfile": "src/azurelinux/3.0/net10.0/cross/loongarch64-musl",
+              "os": "linux",
+              "osVersion": "azurelinux3.0",
+              "tags": {
+                "azurelinux-3.0-net10.0-cross-loongarch64-musl": {}
+              }
+            }
+          ]
+        },
         {
           "platforms": [
             {