ENH: detect Python x64 on Windows arm64 cross builds

.github/workflows/debug.yml

@@ -0,0 +1,60 @@
+# SPDX-FileCopyrightText: 2021 The meson-python developers
+#
+# SPDX-License-Identifier: MIT
+
+name: debug
+
+on:
+  push:
+    branches:
+      - main
+      - release-*
+  pull_request:
+    branches:
+      - main
+      - release-*
+
+permissions: {}
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: windows-11-arm
+            python: '3.14'
+            architecture: x64
+          - os: windows-11-arm
+            python: '3.14'
+            architecture: arm64
+          - os: windows-latest
+            python: '3.14'
+          - os: windows-latest
+            python: '3.14'
+            architecture: x86
+
+    steps:
+      - uses: actions/checkout@v7
+        with:
+          persist-credentials: false
+
+      - uses: actions/setup-python@v7
+        with:
+          python-version: ${{ matrix.python }}
+          architecture: ${{ matrix.architecture }}
+          allow-prereleases: true
+
+      - run: python -m pip install .
+
+      - run: |
+          import platform
+          import mesonpy
+          print('interpreter:', mesonpy._windows_interpreter_arch())
+          print('platform:', platform.machine().lower())
+        shell: python

mesonpy/__init__.py

@@ -256,6 +256,18 @@ def _showwarning(message: Union[Warning, str], category: Type[Warning], filename
     _log(f'{style.WARNING}meson-python: warning:{style.RESET} {message}')
 
 
+def _windows_interpreter_arch() -> str:
+    """Return the Windows architecture for which the Python interpreter has been compiled."""
+    match sysconfig.get_platform():
+        case 'win32':
+            return 'x86'
+        case 'win-amd64':
+            return 'amd64'
+        case 'win-arm64':
+            return 'arm64'
+    raise ValueError
+
+
 class _clicounter:
     def __init__(self, total: int) -> None:
         self._total = total
@@ -846,6 +858,13 @@ def __init__(self,
             self._meson_cross_file.write_text(cross_file_data, encoding='utf-8')
             self._meson_args['setup'].extend(('--cross-file', os.fspath(self._meson_cross_file)))
 
+        elif sys.platform == 'win32':
+            arch = _windows_interpreter_arch()
+            nativearch = platform.machine().lower()
+
+            if arch != nativearch:
+                pass
+
         # write the native file
         native_file_data = textwrap.dedent(f'''
             [binaries]