Add riscv64 CI test with qemu.

Author: wanghan-sanechips

.github/workflows/kvrocks.yaml

@@ -223,11 +223,21 @@ jobs:
             os: ubuntu-24.04-arm
             compiler: clang
             arm_linux: true
+          - name: Ubuntu RISC-V GCC without luaJIT (QEMU)
+            os: ubuntu-24.04
+            riscv_toolchain: true
+            toolchain_file: cmake/riscv64.cmake
+            riscv_toolchain_url: "https://github.com/riscv-collab/riscv-gnu-toolchain/releases/download/2025.07.03/riscv64-glibc-ubuntu-24.04-gcc-nightly-2025.07.03-nightly.tar.xz"
+            cmake_crosscompiling: -DCMAKE_CROSSCOMPILING=TRUE
+            cmake_system_name: -DCMAKE_SYSTEM_NAME=Linux
+            cmake_system_processor: -DCMAKE_SYSTEM_PROCESSOR=riscv64
+            without_luajit: -DENABLE_LUAJIT=OFF
 
     runs-on: ${{ matrix.os }}
     env:
       SONARCLOUD_OUTPUT_DIR: sonarcloud-data
       FORCE_JAVASCRIPT_ACTIONS_TO_NODE20: true
+      RISCV_PATH: "/opt/riscv"
     steps:
       - name: Setup macOS
         if: ${{ startsWith(matrix.os, 'macos') }}
@@ -253,6 +263,20 @@ jobs:
         if: ${{ matrix.arm_linux }}
         run: |
           sudo apt install -y git build-essential cmake libtool python3 python3-pip libssl-dev
+      - name: Setup RISC-V Toolchain
+        if: ${{ matrix.riscv_toolchain }}
+        run: |
+          sudo apt install -y wget build-essential cmake git python3 \
+            libgflags-dev libsnappy-dev zlib1g-dev liblz4-dev libzstd-dev \
+            qemu-user qemu-user-static
+          sudo mkdir -p $RISCV_PATH
+          wget "${{ matrix.riscv_toolchain_url }}" -O riscv-toolchain.tar.xz
+          sudo tar -xvf riscv-toolchain.tar.xz -C $RISCV_PATH --strip-components=1
+          sudo sed -i "s|libdir='/mnt/riscv/riscv64-unknown-linux-gnu/lib'|libdir='$RISCV_PATH/riscv64-unknown-linux-gnu/lib'|g" \
+            $RISCV_PATH/riscv64-unknown-linux-gnu/lib/libatomic.la
+          echo "PATH=$RISCV_PATH/bin:$PATH" >> $GITHUB_ENV
+          echo "LD_LIBRARY_PATH=/opt/riscv/lib:$LD_LIBRARY_PATH" >> $GITHUB_ENV
+          echo "QEMU_LD_PREFIX=$RISCV_PATH/sysroot" >> $GITHUB_ENV
 
       - name: Cache redis
         id: cache-redis
@@ -298,7 +322,7 @@ jobs:
         if: ${{ matrix.sonarcloud }}
 
       - name: Build Kvrocks
-        if: ${{ !matrix.sonarcloud }}
+        if: ${{ !matrix.sonarcloud && !matrix.riscv_toolchain }}
         run: |
           ./x.py build -j$NPROC --unittest --compiler ${{ matrix.compiler }} ${{ matrix.without_jemalloc }} \
             ${{ matrix.without_luajit }} ${{ matrix.with_ninja }} ${{ matrix.with_sanitizer }} ${{ matrix.with_openssl }} \
@@ -311,6 +335,11 @@ jobs:
           cp -r build _build
           build-wrapper-linux-x86-64 --out-dir ${{ env.SONARCLOUD_OUTPUT_DIR }} ./x.py build -j$NPROC --unittest --compiler ${{ matrix.compiler }} ${{ matrix.sonarcloud }}
 
+      - name: Build Kvrocks (RISC-V)
+        if: ${{ matrix.riscv_toolchain }}
+        run: |
+          ./x.py build -j$NPROC --unittest --toolchain ${{ matrix.toolchain_file }}
+
       - name: Setup Coredump
         if: ${{ startsWith(matrix.os, 'ubuntu') }}
         run: |

cmake/jemalloc.cmake

@@ -43,7 +43,7 @@ if(NOT jemalloc_POPULATED)
   execute_process(COMMAND autoconf
     WORKING_DIRECTORY ${jemalloc_SOURCE_DIR}
   )
-  execute_process(COMMAND ${jemalloc_SOURCE_DIR}/configure CC=${CMAKE_C_COMPILER} -C --enable-autogen
+  execute_process(COMMAND ${jemalloc_SOURCE_DIR}/configure CC=${CMAKE_C_COMPILER} -C ${JEMALLOC_CROSS_FLAGS} --enable-autogen
                     --disable-shared --disable-libdl ${DISABLE_CACHE_OBLIVIOUS} ${ENABLE_JEMALLOC_PROFILING}
                     --with-jemalloc-prefix=""
     WORKING_DIRECTORY ${jemalloc_BINARY_DIR}

cmake/riscv64.cmake

@@ -0,0 +1,33 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR riscv64)
+set(CMAKE_CROSSCOMPILING TRUE)
+
+set(CMAKE_C_COMPILER "riscv64-unknown-linux-gnu-gcc")
+set(CMAKE_CXX_COMPILER "riscv64-unknown-linux-gnu-g++")
+
+add_compile_options("-march=rv64gc")
+
+set(JEMALLOC_CROSS_FLAGS
+    "--host=riscv64-unknown-linux-gnu"
+    "--build=${CMAKE_HOST_SYSTEM_PROCESSOR}-pc-linux-gnu"
+    "--with-lg-vaddr=48"
+    CACHE STRING "jemalloc flags for RISC-V cross-compilation"
+)
+set(ENABLE_LUAJIT OFF CACHE BOOL "Disable LuaJIT on RISC-V" FORCE)

cmake/tbb.cmake

@@ -20,8 +20,8 @@ include_guard()
 include(cmake/utils.cmake)
 
 FetchContent_DeclareGitHubWithMirror(tbb
-  uxlfoundation/oneTBB v2022.2.0
-  MD5=b00d733b2adf0fba1d33855689631b4d
+  uxlfoundation/oneTBB v2022.1.0
+  MD5=4a8940795f7e414727a1c443b94fd686
 )
 
 FetchContent_MakeAvailableWithArgs(tbb

x.py

@@ -114,7 +114,7 @@ def prepare() -> None:
             print(f"{hook.name} installed at {dst}.")
 
 def build(dir: str, jobs: Optional[int], ninja: bool, unittest: bool, compiler: str, cmake_path: str, D: List[str],
-          skip_build: bool) -> None:
+          skip_build: bool, toolchain: Optional[str] = None) -> None:
     basedir = Path(__file__).parent.absolute()
 
     find_command("autoconf", msg="autoconf is required to build jemalloc")
@@ -129,6 +129,8 @@ def build(dir: str, jobs: Optional[int], ninja: bool, unittest: bool, compiler:
     os.makedirs(dir, exist_ok=True)
 
     cmake_options = ["-DCMAKE_BUILD_TYPE=RelWithDebInfo"]
+    if toolchain:
+       cmake_options.append(f"-DCMAKE_TOOLCHAIN_FILE={toolchain}")
     if ninja:
         cmake_options.append("-G Ninja")
     if compiler == 'gcc':
@@ -389,6 +391,7 @@ def test_go(dir: str, cli_path: str, rest: List[str]) -> None:
     parser_build.add_argument('--unittest', default=False, action='store_true', help='build unittest target')
     parser_build.add_argument('--compiler', default='auto', choices=('auto', 'gcc', 'clang'),
                               help="compiler used to build kvrocks")
+    parser_build.add_argument('--toolchain', metavar='FILE', help="path to CMake toolchain file for cross-compiling")
     parser_build.add_argument('--cmake-path', default='cmake', help="path of cmake binary used to build kvrocks")
     parser_build.add_argument('-D', action='append', metavar='key=value', help='extra CMake definitions')
     parser_build.add_argument('--skip-build', default=False, action='store_true',