Add linux arm builds

.github/workflows/MainDistributionPipeline.yml

@@ -18,7 +18,7 @@ jobs:
     with:
       duckdb_version: v1.0.0
       extension_name: delta
-      exclude_archs: 'wasm_mvp;wasm_eh;wasm_threads;windows_amd64_rtools;windows_amd64;linux_arm64'
+      exclude_archs: 'wasm_mvp;wasm_eh;wasm_threads;windows_amd64_rtools;windows_amd64'
 
   duckdb-stable-deploy:
     name: Deploy extension binaries
@@ -28,5 +28,5 @@ jobs:
     with:
       extension_name: delta
       duckdb_version: v1.0.0
-      exclude_archs: 'wasm_mvp;wasm_eh;wasm_threads;windows_amd64_rtools;windows_amd64;linux_arm64'
+      exclude_archs: 'wasm_mvp;wasm_eh;wasm_threads;windows_amd64_rtools;windows_amd64'
       deploy_latest: ${{ startsWith(github.ref, 'refs/tags/v') || github.ref == 'refs/heads/main' }}

.github/workflows/_extension_distribution.yml

@@ -140,9 +140,15 @@ jobs:
           ./duckdb/scripts/setup_manylinux2014.sh general aws-cli ccache ssh python_alias openssl
 
       - name: Setup Rust
-        if: ${{ matrix.duckdb_arch == 'linux_amd64' }}
+        if: ${{ matrix.duckdb_arch == 'linux_amd64'}}
         uses: dtolnay/rust-toolchain@stable
 
+      - name: Setup Rust for cross compilation
+        if: ${{ matrix.duckdb_arch == 'linux_arm64'}}
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: aarch64-unknown-linux-gnu
+
       - name: Setup Rust for manylinux (dtolnay/rust-toolchain doesn't work due to curl being old here)
         if: ${{ matrix.duckdb_arch == 'linux_amd64_gcc4' }}
         run: |

CMakeLists.txt

@@ -35,11 +35,19 @@
 # Set default ExternalProject root directory
 set_directory_properties(PROPERTIES EP_PREFIX ${CMAKE_BINARY_DIR}/rust)
 
+set(RUST_ENV_VARS "")
+
 # Propagate arch to rust build for CI
 set(RUST_PLATFORM_TARGET "")
 if("${OS_NAME}" STREQUAL "linux")
     if ("${OS_ARCH}" STREQUAL "arm64")
         set(RUST_PLATFORM_TARGET "aarch64-unknown-linux-gnu")
+    elseif("${CMAKE_CXX_COMPILER}" MATCHES "aarch64")
+        set(RUST_ENV_VARS ${RUST_ENV_VARS} CFLAGS_aarch64_unknown_linux_gnu=--sysroot=/usr/aarch64-linux-gnu)
+        set(RUST_ENV_VARS ${RUST_ENV_VARS} CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-linux-gnu-gcc)
+        set(RUST_ENV_VARS ${RUST_ENV_VARS} OPENSSL_LIB_DIR=${CMAKE_BINARY_DIR}/vcpkg_installed/${VCPKG_TARGET_TRIPLET}/lib)
+        set(RUST_ENV_VARS ${RUST_ENV_VARS} OPENSSL_INCLUDE_DIR=${CMAKE_BINARY_DIR}/vcpkg_installed/${VCPKG_TARGET_TRIPLET}/include)
+        set(RUST_PLATFORM_TARGET "aarch64-unknown-linux-gnu")
     else()
         set(RUST_PLATFORM_TARGET "x86_64-unknown-linux-gnu")
     endif()
@@ -56,20 +64,33 @@
     endif()
 endif()
 
+string(STRIP "${RUST_ENV_VARS}" RUST_ENV_VARS)
+
+# Having these set will mess up cross compilation to linux arm
+set(RUST_UNSET_ENV_VARS --unset=CC --unset=CXX --unset=LD)
+
 # Add rust_example as a CMake target
 ExternalProject_Add(
         ${KERNEL_NAME}
         GIT_REPOSITORY "https://github.com/nicklan/delta-kernel-rs"
         GIT_TAG 181232a45562ca78be763c2f5fb46b88a2463b5c
-        CONFIGURE_COMMAND ""
+        # Prints the env variables passed to the cargo build to the terminal, useful in debugging because passing them
+        # through CMake is an error-prone mess
+        CONFIGURE_COMMAND ${CMAKE_COMMAND} -E env ${RUST_UNSET_ENV_VARS} ${RUST_ENV_VARS} env
         UPDATE_COMMAND ""
         BUILD_IN_SOURCE 1
         # Build debug build
-        BUILD_COMMAND cargo build --package delta_kernel_ffi --workspace --all-features --target=${RUST_PLATFORM_TARGET}
+        BUILD_COMMAND
+            ${CMAKE_COMMAND} -E env ${RUST_UNSET_ENV_VARS} ${RUST_ENV_VARS}
+            cargo build --package delta_kernel_ffi --workspace --all-features --target=${RUST_PLATFORM_TARGET}
         # Build release build
-        COMMAND cargo build --package delta_kernel_ffi --workspace --all-features --release --target=${RUST_PLATFORM_TARGET}
+        COMMAND
+            ${CMAKE_COMMAND} -E env ${RUST_UNSET_ENV_VARS} ${RUST_ENV_VARS}
+            cargo build --package delta_kernel_ffi --workspace --all-features --release --target=${RUST_PLATFORM_TARGET}
         # Build DATs
-        COMMAND cargo build --manifest-path=${CMAKE_BINARY_DIR}/rust/src/delta_kernel/acceptance/Cargo.toml
+        COMMAND
+            ${CMAKE_COMMAND} -E env ${RUST_UNSET_ENV_VARS} ${RUST_ENV_VARS}
+            cargo build --manifest-path=${CMAKE_BINARY_DIR}/rust/src/delta_kernel/acceptance/Cargo.toml
         BUILD_BYPRODUCTS "${CMAKE_BINARY_DIR}/rust/src/delta_kernel/target/${RUST_PLATFORM_TARGET}/debug/libdelta_kernel_ffi.a"
         BUILD_BYPRODUCTS "${CMAKE_BINARY_DIR}/rust/src/delta_kernel/target/${RUST_PLATFORM_TARGET}/release/libdelta_kernel_ffi.a"
         BUILD_BYPRODUCTS "${CMAKE_BINARY_DIR}/rust/src/delta_kernel/target/ffi-headers/delta_kernel_ffi.h"