diff --git a/.github/workflows/windows-build.yml b/.github/workflows/windows-build.yml
index aef44a8ee..f239386e4 100644
--- a/.github/workflows/windows-build.yml
+++ b/.github/workflows/windows-build.yml
@@ -12,9 +12,14 @@ on:
 jobs:
   build:
     runs-on: windows-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        compiler: [msvc, clang]
     env:
       boost_version: 1.83.0
       BOOST_ROOT: ${{ github.workspace }}\deps\boost_1_83_0
+      build_script: ${{ matrix.compiler == 'msvc' && './build.bat' || './build-clang.bat' }}
       RIME_PLUGINS: ${{ inputs.rime_plugins }}
     steps:
       - name: Checkout last commit
@@ -23,34 +28,53 @@ jobs:
           repository: ${{ inputs.repository }}
           submodules: recursive
 
-      - name: Configure build environment
+      - name: Configure MSVC
+        if: ${{ matrix.compiler == 'msvc' }}
         run: |
           copy env.vs2022.bat env.bat
+
+      - name: Configure clang
+        if: ${{ matrix.compiler == 'clang' }}
+        run: |
+          choco upgrade -y llvm
+          pip install ninja
+
+      - name: Configure build environment
+        run: |
           $git_ref_name = git describe --always
           echo "git_ref_name=$git_ref_name" >> $env:GITHUB_ENV
+          git submodule > submodule-status
 
-      - name: Cache Boost
-        id: cache-boost
+      - name: Cache Boost source
+        id: cache-boost-src
         uses: actions/cache@v3
         with:
           path: |
             ${{ env.BOOST_ROOT }}.7z
-            ${{ env.BOOST_ROOT }}\stage
-          key: ${{ runner.os }}-boost-${{ env.boost_version }}
+          key: ${{ runner.os }}-boost-${{ env.boost_version }}-${{ matrix.compiler }}-src
+
+      - name: Download Boost source
+        if: steps.cache-boost-src.outputs.cache-hit != 'true'
+        run: |
+          aria2c https://boostorg.jfrog.io/artifactory/main/release/1.83.0/source/boost_1_83_0.7z -d deps
 
       - name: Extract Boost source tarball
-        if: steps.cache-boost.outputs.cache-hit == 'true'
         run: |
           pushd deps
           7z x ${{ env.BOOST_ROOT }}.7z
           popd
 
-      - name: Install Boost
-        if: steps.cache-boost.outputs.cache-hit != 'true'
-        run: .\install-boost.bat
+      - name: Cache Boost lib
+        id: cache-boost-lib
+        uses: actions/cache@v3
+        with:
+          path: |
+            ${{ env.BOOST_ROOT }}\stage
+          key: ${{ runner.os }}-boost-${{ env.boost_version }}-${{ matrix.compiler }}-lib
 
-      - name: Check submodules
-        run: git submodule > submodule-status
+      - name: Install Boost
+        if: steps.cache-boost-lib.outputs.cache-hit != 'true'
+        run: ${{ env.build_script }} boost
 
       - name: Cache dependencies
         id: cache-deps
@@ -61,19 +85,20 @@ jobs:
             include
             lib
             share
-          key: ${{ runner.os }}-deps-${{ hashFiles('submodule-status') }}
+          key: ${{ runner.os }}-${{ matrix.compiler }}-${{ hashFiles('submodule-status') }}
 
       - name: Build dependencies
         if: steps.cache-deps.outputs.cache-hit != 'true'
-        run: .\build.bat deps
+        run: ${{ env.build_script }} deps
 
       - name: Install Rime plugins
         run: .\action-install-plugins-windows.bat
 
       - name: Build and test
-        run: .\build.bat test
+        run: ${{ env.build_script }} test
 
       - name: Create distributable
+        if: ${{ matrix.compiler == 'msvc' }}
         run: |
           7z a rime-${{ env.git_ref_name }}-${{ runner.os }}.7z `
           dist version-info.txt
@@ -81,6 +106,7 @@ jobs:
           bin include lib share
 
       - name: Upload artifacts
+        if: ${{ matrix.compiler == 'msvc' }}
         uses: actions/upload-artifact@v3
         with:
           path: |
diff --git a/.gitignore b/.gitignore
index 7e4a4b1d5..6ec9dae1d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,4 @@ node_modules/
 *~
 .*.swp
 .cache/
+*.7z
diff --git a/build-clang.bat b/build-clang.bat
new file mode 100644
index 000000000..8d5aa9267
--- /dev/null
+++ b/build-clang.bat
@@ -0,0 +1,156 @@
+@echo off
+
+if "%BOOST_ROOT%" == "" (
+  echo Please set BOOST_ROOT environment variable.
+  exit
+)
+
+set RIME_ROOT=%CD%
+
+@REM Build for native architecture
+set arch=x86
+if "%PROCESSOR_ARCHITECTURE%" == "ARM64" set arch=arm
+
+set clean=0
+set build_boost=0
+set build_deps=0
+set build_librime=0
+set build_test=OFF
+
+:parse_cmdline_options
+if "%1" == "" goto end_parsing_cmdline_options
+if "%1" == "clean" set clean=1
+if "%1" == "boost" set build_boost=1
+if "%1" == "deps" set build_deps=1
+if "%1" == "librime" set build_librime=1
+if "%1" == "test" (
+  set build_librime=1
+  set build_test=ON
+)
+shift
+goto parse_cmdline_options
+:end_parsing_cmdline_options
+
+if %clean% == 0 (
+if %build_boost% == 0 (
+if %build_deps% == 0 (
+  set build_librime=1
+)))
+
+if %clean% == 1 (
+  rmdir /s /q build
+  rmdir /s /q deps\glog\build
+  rmdir /s /q deps\googletest\build
+  rmdir /s /q deps\leveldb\build
+  rmdir /s /q deps\marisa-trie\build
+  rmdir /s /q deps\opencc\build
+  rmdir /s /q deps\yaml-cpp\build
+)
+
+if %build_boost% == 1 (
+  pushd %BOOST_ROOT% || exit
+  if not exist b2.exe call .\bootstrap.bat || exit
+  b2 toolset=clang-win^
+    architecture=%arch%^
+    address-model=64^
+    variant=release^
+    link=static^
+    runtime-link=static^
+    stage^
+    --with-filesystem^
+    --with-system^
+    --with-regex || exit
+  popd
+)
+
+set common_cmake_flags=-B build^
+  -G Ninja^
+  -DCMAKE_C_COMPILER=clang^
+  -DCMAKE_CXX_COMPILER=clang++^
+  -DCMAKE_BUILD_TYPE:STRING=Release^
+  -DCMAKE_USER_MAKE_RULES_OVERRIDE:PATH="%RIME_ROOT%\cmake\c_flag_overrides.cmake"^
+  -DCMAKE_USER_MAKE_RULES_OVERRIDE_CXX:PATH="%RIME_ROOT%\cmake\cxx_flag_overrides.cmake"^
+  -DCMAKE_EXE_LINKER_FLAGS_INIT:STRING="-llibcmt"^
+  -DCMAKE_MSVC_RUNTIME_LIBRARY:STRING=MultiThreaded
+
+set deps_cmake_flags=%common_cmake_flags%^
+  -DBUILD_SHARED_LIBS:BOOL=OFF^
+  -DCMAKE_INSTALL_PREFIX:PATH="%RIME_ROOT%"
+
+if %build_deps% == 1 (
+  echo building glog.
+  pushd deps\glog
+  cmake . %deps_cmake_flags%^
+    -DWITH_GFLAGS:BOOL=OFF^
+    -DBUILD_TESTING:BOOL=OFF || exit
+  cmake --build build || exit
+  cmake --install build || exit
+  popd
+
+  echo building leveldb.
+  pushd deps\leveldb
+  cmake . %deps_cmake_flags%^
+    -DCMAKE_CXX_FLAGS:STRING="-Wno-error=deprecated-declarations"^
+    -DLEVELDB_BUILD_BENCHMARKS:BOOL=OFF^
+    -DLEVELDB_BUILD_TESTS:BOOL=OFF || exit
+  cmake --build build || exit
+  cmake --install build || exit
+  popd
+
+  echo building yaml-cpp.
+  pushd deps\yaml-cpp
+  cmake . %deps_cmake_flags%^
+    -DYAML_CPP_BUILD_CONTRIB:BOOL=OFF^
+    -DYAML_CPP_BUILD_TESTS:BOOL=OFF^
+    -DYAML_CPP_BUILD_TOOLS:BOOL=OFF || exit
+  cmake --build build || exit
+  cmake --install build || exit
+  popd
+
+  echo building gtest.
+  pushd deps\googletest
+  cmake . %deps_cmake_flags%^
+    -DBUILD_GMOCK:BOOL=OFF || exit
+  cmake --build build || exit
+  cmake --install build || exit
+  popd
+
+  echo building marisa.
+  pushd deps\marisa-trie
+  cmake .. %deps_cmake_flags% || exit
+  cmake --build build || exit
+  cmake --install build || exit
+  popd
+
+  echo building opencc.
+  pushd deps\opencc
+  cmake . %deps_cmake_flags%^
+    -DCMAKE_CXX_FLAGS:PATH="-I %RIME_ROOT%\include -L %RIME_ROOT%\lib"^
+    -DUSE_SYSTEM_MARISA:BOOL=ON || exit
+  cmake --build build || exit
+  cmake --install build || exit
+  popd
+)
+
+set rime_cmake_flags=%common_cmake_flags%^
+  -DBUILD_STATIC:BOOL=ON^
+  -DBUILD_SHARED_LIBS:BOOL=ON^
+  -DBUILD_TEST:BOOL="%build_test%"^
+  -DENABLE_LOGGING:BOOL=ON^
+  -DCMAKE_INSTALL_PREFIX:PATH="%RIME_ROOT%\dist"
+
+if %build_librime% == 1 (
+  echo building librime.
+  echo %rime_cmake_flags%
+  cmake . %rime_cmake_flags% || exit
+  cmake --build build || exit
+  cmake --install build || exit
+)
+
+if "%build_test%" == "ON" (
+  echo 233
+  copy /y dist\lib\rime.dll build\test
+  pushd build\test
+  .\rime_test.exe || exit
+  popd
+)
diff --git a/cmake/c_flag_overrides.cmake b/cmake/c_flag_overrides.cmake
index f30601875..73fde7ff9 100644
--- a/cmake/c_flag_overrides.cmake
+++ b/cmake/c_flag_overrides.cmake
@@ -1,6 +1,10 @@
-if(MSVC)
-  set(CMAKE_C_FLAGS_DEBUG_INIT "/D_DEBUG /MTd /Zi /Ob0 /Od /RTC1")
-  set(CMAKE_C_FLAGS_MINSIZEREL_INIT     "/MT /O1 /Ob1 /D NDEBUG")
-  set(CMAKE_C_FLAGS_RELEASE_INIT        "/MT /O2 /Ob2 /D NDEBUG")
-  set(CMAKE_C_FLAGS_RELWITHDEBINFO_INIT "/MT /Zi /Od /Ob1 /D NDEBUG")
+if(WIN32)
+  if(MSVC)
+    set(CMAKE_C_FLAGS_DEBUG_INIT "/D_DEBUG /MTd /Zi /Ob0 /Od /RTC1")
+    set(CMAKE_C_FLAGS_MINSIZEREL_INIT     "/MT /O1 /Ob1 /D NDEBUG")
+    set(CMAKE_C_FLAGS_RELEASE_INIT        "/MT /O2 /Ob2 /D NDEBUG")
+    set(CMAKE_C_FLAGS_RELWITHDEBINFO_INIT "/MT /Zi /Od /Ob1 /D NDEBUG")
+  else()
+    set(CMAKE_C_FLAGS_RELEASE_INIT "-D_MT -O3 -DNDEBUG")
+  endif()
 endif()
diff --git a/cmake/cxx_flag_overrides.cmake b/cmake/cxx_flag_overrides.cmake
index 0a8c66275..73cc9ef95 100644
--- a/cmake/cxx_flag_overrides.cmake
+++ b/cmake/cxx_flag_overrides.cmake
@@ -1,6 +1,10 @@
-if(MSVC)
-  set(CMAKE_CXX_FLAGS_DEBUG_INIT "/D_DEBUG /MTd /Zi /Ob0 /Od /RTC1")
-  set(CMAKE_CXX_FLAGS_MINSIZEREL_INIT     "/MT /O1 /Ob1 /D NDEBUG")
-  set(CMAKE_CXX_FLAGS_RELEASE_INIT        "/MT /O2 /Ob2 /D NDEBUG")
-  set(CMAKE_CXX_FLAGS_RELWITHDEBINFO_INIT "/MT /Zi /Od /Ob1 /D NDEBUG")
+if(WIN32)
+  if(MSVC)
+    set(CMAKE_CXX_FLAGS_DEBUG_INIT "/D_DEBUG /MTd /Zi /Ob0 /Od /RTC1")
+    set(CMAKE_CXX_FLAGS_MINSIZEREL_INIT     "/MT /O1 /Ob1 /D NDEBUG")
+    set(CMAKE_CXX_FLAGS_RELEASE_INIT        "/MT /O2 /Ob2 /D NDEBUG")
+    set(CMAKE_CXX_FLAGS_RELWITHDEBINFO_INIT "/MT /Zi /Od /Ob1 /D NDEBUG")
+  else()
+    set(CMAKE_CXX_FLAGS_RELEASE_INIT "-D_MT -O3 -DNDEBUG")
+  endif()
 endif()
diff --git a/src/rime/algo/encoder.h b/src/rime/algo/encoder.h
index 0a50c6275..047f2fc87 100644
--- a/src/rime/algo/encoder.h
+++ b/src/rime/algo/encoder.h
@@ -70,7 +70,7 @@ class TableEncoder : public Encoder {
   RIME_API bool LoadSettings(Config* config);
 
   RIME_API bool Encode(const RawCode& code, string* result);
-  bool EncodePhrase(const string& phrase, const string& value);
+  RIME_API bool EncodePhrase(const string& phrase, const string& value);
 
   RIME_API bool IsCodeExcluded(const string& code);