feat: add support for automatically building win arm wheels

Author: nagic0

Diff for: .github/workflows/wheel.yml

@@ -45,6 +45,8 @@ jobs:
           cmake --build ${{github.workspace}}/build_win32 --config Release --target install --parallel 8
           cmake -A x64   -B ${{github.workspace}}/build_amd64 -DSPM_ENABLE_SHARED=OFF -DCMAKE_INSTALL_PREFIX=${{github.workspace}}/build/root_amd64
           cmake --build ${{github.workspace}}/build_amd64 --config Release --target install --parallel 8
+          cmake -A arm64 -B ${{github.workspace}}/build_arm64 -DSPM_ENABLE_SHARED=OFF -DCMAKE_INSTALL_PREFIX=${{github.workspace}}/build/root_arm64
+          cmake --build ${{github.workspace}}/build_arm64 --config Release --target install --parallel 8
 
       - name: Build for Mac
         if: runner.os == 'macOS'
@@ -66,6 +68,7 @@ jobs:
         env:
           CIBW_ARCHS_LINUX: auto aarch64
           CIBW_ARCHS_MACOS: x86_64 universal2 arm64
+          CIBW_ARCHS_WINDOWS: auto ARM64
           CIBW_SKIP: "pp* *-musllinux_*"
           CIBW_BUILD_VERBOSITY: 1
 

Diff for: python/setup.py

@@ -104,13 +104,21 @@ def build_extension(self, ext):
     _build_ext.build_extension(self, ext)
 
 
-if os.name == 'nt':
-  # Must pre-install sentencepice into build directory.
+def get_win_arch():
   arch = 'win32'
   if sys.maxsize > 2**32:
     arch = 'amd64'
   if 'arm' in platform.machine().lower():
     arch = 'arm64'
+  if os.getenv('PYTHON_ARCH', '') == 'ARM64':
+    # Special check for arm64 under ciwheelbuild, see https://github.com/pypa/cibuildwheel/issues/1942
+    arch = 'arm64'
+  return arch
+
+
+if os.name == 'nt':
+  # Must pre-install sentencepice into build directory.
+  arch = get_win_arch()
   if os.path.exists('..\\build\\root_{}\\lib'.format(arch)):
     cflags = ['/std:c++17', '/I..\\build\\root_{}\\include'.format(arch)]
     libs = [