From a43913b7e3b4814b28250c111bc7feba4d59c909 Mon Sep 17 00:00:00 2001
From: Daniele Nicolodi <daniele@grinta.net>
Date: Mon, 14 Sep 2026 23:02:03 +0200
Subject: [PATCH 1/4] ENH: detect Python x64 on Windows arm64 cross builds

---
 .github/workflows/debug.yml | 52 +++++++++++++++++++++++++++++++++++++
 mesonpy/_windows.py         | 36 +++++++++++++++++++++++++
 2 files changed, 88 insertions(+)
 create mode 100644 .github/workflows/debug.yml
 create mode 100644 mesonpy/_windows.py

diff --git a/.github/workflows/debug.yml b/.github/workflows/debug.yml
new file mode 100644
index 000000000..c2ad89013
--- /dev/null
+++ b/.github/workflows/debug.yml
@@ -0,0 +1,52 @@
+# 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:
+        os:
+          - windows-11-arm
+        python:
+          - '3.14'
+        architecture:
+          - x64
+          - arm64
+          
+    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: python -c 'import sysconfig; print(sysconfig.get_platform())'
+      - run: python -c 'import platform; print(platform.machine())'
+      - run: python -c 'import mesonpy._windows as w; print(w.platform())'
diff --git a/mesonpy/_windows.py b/mesonpy/_windows.py
new file mode 100644
index 000000000..6083edaec
--- /dev/null
+++ b/mesonpy/_windows.py
@@ -0,0 +1,36 @@
+import ctypes
+from ctypes import wintypes
+
+kernel32 = ctypes.WinDLL('kernel32', use_last_error=True)
+
+IsWow64Process2 = kernel32.IsWow64Process2
+IsWow64Process2.argtypes = [
+    wintypes.HANDLE,
+    ctypes.POINTER(wintypes.USHORT),
+    ctypes.POINTER(wintypes.USHORT),
+]
+IsWow64Process2.restype = wintypes.BOOL
+
+IMAGE_FILE_MACHINE_UNKNOWN = 0x0000
+IMAGE_FILE_MACHINE_AMD64   = 0x8664
+IMAGE_FILE_MACHINE_ARM64   = 0xAA64
+IMAGE_FILE_MACHINE_I386    = 0x014c
+
+MACHINE = {
+    IMAGE_FILE_MACHINE_UNKNOWN: 'unknown', # native, no WOW64
+    IMAGE_FILE_MACHINE_AMD64: 'amd64',
+    IMAGE_FILE_MACHINE_ARM64: 'arm64',
+    IMAGE_FILE_MACHINE_I386: 'x86',
+}
+
+def platform():
+    handle = kernel32.GetCurrentProcess()
+
+    process = wintypes.USHORT()
+    native = wintypes.USHORT()
+    
+    r = IsWow64Process2(handle, ctypes.byref(process), ctypes.byref(native))
+    if not r:    
+        raise ctypes.WinError(ctypes.get_last_error())
+    
+    return native.value, process.value, MACHINE[native.value], MACHINE[process.value]

From 658b202792495da70e2e2327cc4ea271d0675a5f Mon Sep 17 00:00:00 2001
From: Daniele Nicolodi <daniele@grinta.net>
Date: Tue, 15 Sep 2026 21:21:47 +0200
Subject: [PATCH 2/4] debug

---
 .github/workflows/tests.yml | 361 ------------------------------------
 1 file changed, 361 deletions(-)
 delete mode 100644 .github/workflows/tests.yml

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
deleted file mode 100644
index 517b6d26d..000000000
--- a/.github/workflows/tests.yml
+++ /dev/null
@@ -1,361 +0,0 @@
-# SPDX-FileCopyrightText: 2021 The meson-python developers
-#
-# SPDX-License-Identifier: MIT
-
-name: tests
-
-on:
-  push:
-    branches:
-      - main
-      - release-*
-  pull_request:
-    branches:
-      - main
-      - release-*
-    paths:
-      # This is spelt like this to do not ignore the docs/examples/ folder.
-      - '**'
-      - '!docs/**'
-      - '!CHANGELOG.rst'
-      - '!LICENSE'
-      - '!LICENSES/**'
-      - '!README.rst'
-      - '!.github/workflows/docs.yml'
-  workflow_dispatch:
-    # Allow to run manually
-
-permissions: {}
-
-env:
-  FORCE_COLOR: 1
-  PIP_DISABLE_PIP_VERSION_CHECK: 1
-
-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:
-        os:
-          - ubuntu-latest
-          - windows-latest
-          - macos-latest
-          # GitHub Actions switched to macOS on amr64 by default. Keep
-          # a job running on macOS on x86-64 for a while longer.
-          - macos-15-intel
-        python:
-          - '3.10'
-          - '3.15'
-        meson:
-          -
-        dependencies:
-          -
-        include:
-          - os: ubuntu-latest
-            python: 'pypy-3.11'
-          # Test with older supported Meson version.  Meson up to
-          # version 1.2.3 requires distutils, which has been removed
-          # from the stdlib in Python 3.12, thus test with Pythn 3.11.
-          # To avoid having too many CI jobs, combine this with tests
-          # with the minimum version of other dependencies.
-          - os: ubuntu-latest
-            python: '3.11'
-            meson: '~=0.64.0'
-          - os: ubuntu-latest
-            python: '3.11'
-            meson: '~=1.0.0'
-          - os: ubuntu-latest
-            python: '3.11'
-            meson: '~=1.1.0'
-          - os: ubuntu-latest
-            python: '3.12'
-            meson: '~=1.2.3'
-          - os: ubuntu-latest
-            python: '3.12'
-            meson: '~=1.3.0'
-          - os: ubuntu-latest
-            python: '3.12'
-            meson: '~=1.4.0'
-          - os: ubuntu-latest
-            python: '3.12'
-            meson: '~=1.5.0'
-            dependencies: 'packaging==23.2 pyproject-metadata==0.9.0'
-          - os: ubuntu-latest
-            python: '3.12'
-            meson: '~=1.6.0'
-            dependencies: 'pyproject-metadata==0.9.0'
-          - os: ubuntu-latest
-            python: '3.12'
-            meson: '~=1.7.0'
-            dependencies: 'packaging==23.2'
-          - os: ubuntu-latest
-            python: '3.13'
-            meson: '~=1.8.0'
-          # Test with Meson master branch.
-          - os: ubuntu-latest
-            python: '3.14'
-            meson: '@git+https://github.com/mesonbuild/meson.git'
-          - os: windows-latest
-            python: '3.14'
-            meson: '@git+https://github.com/mesonbuild/meson.git'
-          # Test free-threaded builds to verify the correct handling of the
-          # 'abi3t' stable ABI, see PEP 803. Test on Linux and Windows to cover
-          # the case where stable ABI extension modules use a dedicated
-          # filename suffix and the case where they do not.
-          - os: ubuntu-latest
-            python: '3.15t'
-          - os: windows-latest
-            python: '3.15t'
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v7
-        with:
-          persist-credentials: false
-
-      - name: Set up target Python
-        uses: actions/setup-python@v7
-        with:
-          python-version: ${{ matrix.python }}
-          allow-prereleases: true
-
-      - name: Install Ninja
-        run: sudo apt-get install ninja-build
-        if: ${{ runner.os == 'Linux' }}
-
-      - name: Install Ninja
-        run: brew install ninja
-        if: ${{ runner.os == 'macOS' }}
-
-      - name: Install Ninja
-        run: python -m pip install ninja
-        if: ${{ runner.os == 'Windows' }}
-
-      - name: Install Meson
-        run: python -m pip install "meson ${{ matrix.meson }}"
-        if: ${{ matrix.meson }}
-
-      - name: Install dependencies
-        run: python -m pip install ${{ matrix.dependencies }}
-        if: ${{ matrix.dependencies }}
-
-      - name: Install
-        run: python -m pip install . --group test
-
-      - name: Run tests
-        run: python -m pytest --showlocals -vv --cov --cov-report=xml
-
-      - name: Upload coverage report
-        uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f  # v7.0.0
-        if: ${{ always() }}
-        env:
-          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
-
-  msvc:
-    runs-on: windows-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        python:
-          - '3.11'
-        meson:
-          -
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v7
-        with:
-          persist-credentials: false
-
-      - name: Set up target Python
-        uses: actions/setup-python@v7
-        with:
-          python-version: ${{ matrix.python }}
-
-      - name: Install Ninja
-        run: python -m pip install ninja
-
-      - name: Setup MSVC
-        uses: bus1/cabuild/action/msdevshell@06ea2833eef61e9b0d0ce0d728416e617e4fb1fe  # v1
-        with:
-          architecture: x64
-
-      - name: Install Meson
-        run: python -m pip install "meson ${{ matrix.meson }}"
-        if: ${{ matrix.meson }}
-
-      - name: Install
-        run: python -m pip install . --group test
-
-      - name: Run tests
-        run: python -m pytest --showlocals -vv
-
-  cygwin:
-    runs-on: windows-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        python:
-          - '3.12'
-        meson:
-          -
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v7
-        with:
-          persist-credentials: false
-
-      - name: Setup Cygwin
-        uses: cygwin/cygwin-install-action@3f0a3f9f988f7e96b8c18098ae05eaec175f5b52  # v6
-        with:
-          packages: >-
-            python312
-            python312-devel
-            python312-pip
-            python312-setuptools
-            python312-virtualenv
-            cmake
-            gcc-core
-            gcc-g++
-            git
-            make
-            ninja
-
-      - name: Fix git dubious ownership
-        # This addresses the "fatal: detected dubious ownership in
-        # repository" and "fatal: not in a git directory" errors
-        # encountered when trying to run Cygwin git in a directory not
-        # owned by the current user. This happens when the tests run
-        # Cygwin git in a directory outside the Cygwin filesystem.
-        run: git config --global --add safe.directory '*'
-        shell: C:\cygwin\bin\env.exe CYGWIN_NOWINPATH=1 CHERE_INVOKING=1 C:\cygwin\bin\bash.exe -leo pipefail -o igncr {0}
-
-      - name: Get pip cache path
-        id: pip-cache-path
-        run: echo "path=$(cygpath -w $(python -m pip cache dir))" >> $GITHUB_OUTPUT
-        shell: C:\cygwin\bin\env.exe CYGWIN_NOWINPATH=1 CHERE_INVOKING=1 C:\cygwin\bin\bash.exe -leo pipefail -o igncr {0}
-
-      - name: Restore cache
-        # Cygwin Python cannot use binary wheels from PyPI. Building
-        # some dependencies takes considerable time. Caching the built
-        # wheels speeds up the CI job quite a bit.
-        uses: actions/cache@v6
-        with:
-          path: ${{ steps.pip-cache-path.outputs.path }}
-          key: cygwin-pip-${{ github.sha }}
-          restore-keys: cygwin-pip-
-          lookup-only: true
-
-      - name: Install Meson
-        run: python -m pip install "meson ${{ matrix.meson }}"
-        if: ${{ matrix.meson }}
-        shell: C:\cygwin\bin\env.exe CYGWIN_NOWINPATH=1 CHERE_INVOKING=1 C:\cygwin\bin\bash.exe -leo pipefail -o igncr {0}
-
-      - name: Install
-        run: python -m pip install . --group test
-        shell: C:\cygwin\bin\env.exe CYGWIN_NOWINPATH=1 CHERE_INVOKING=1 C:\cygwin\bin\bash.exe -leo pipefail -o igncr {0}
-
-      - name: Run tests
-        run: python -m pytest --showlocals -vv
-        shell: C:\cygwin\bin\env.exe CYGWIN_NOWINPATH=1 CHERE_INVOKING=1 C:\cygwin\bin\bash.exe -leo pipefail -o igncr {0}
-
-  homebrew:
-    runs-on: macos-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        python:
-          - '3.10'
-          - '3.12'
-        meson:
-          -
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v7
-        with:
-          persist-credentials: false
-
-      - name: Install Homebrew Python
-        run: |
-          brew install --overwrite python@${{ matrix.python }}
-          echo /opt/homebrew/opt/python@${{ matrix.python }}/libexec/bin/ >> $GITHUB_PATH
-          python${{ matrix.python }} -m pip config set global.break-system-packages true
-
-      - name: Check Python version
-        run: python --version | grep ${{ matrix.python }}
-
-      - name: Install Ninja
-        run: brew install ninja
-
-      - name: Install Meson
-        run: python -m pip install "meson ${{ matrix.meson }}"
-        if: ${{ matrix.meson }}
-
-      - name: Install
-        run: python -m pip install . --group test
-
-      - name: Run tests
-        run: python -m pytest --showlocals -vv
-
-  mypy:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v7
-        with:
-          persist-credentials: false
-
-      - name: Setup Python
-        uses: actions/setup-python@v7
-        with:
-          python-version: '3.10'
-
-      - name: Install dependencies
-        run: python -m pip install .
-
-      - name: Install mypy
-        run: python -m pip install mypy~=2.3.1
-
-      - name: Run mypy
-        run: mypy -p mesonpy
-
-  pixi:
-    runs-on: ubuntu-24.04-arm
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v7
-        with:
-          persist-credentials: false
-
-      - uses: prefix-dev/setup-pixi@f00437f565399d418b0acc85936d12c1fb668347 # v0.10.1
-        with:
-          pixi-version: v0.77.1
-          manifest-path: .github/workflows/pixi.toml
-          cache: false
-
-      - name: Run tests
-        working-directory: .github/workflows
-        run: pixi run test
-
-  uv-sync:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v7
-        with:
-          persist-credentials: false
-
-      - name: Install uv
-        uses: astral-sh/setup-uv@bec219d24cd3e171d82865faccec33120bb574f4 # v10.1.0
-        with:
-          enable-cache: false
-          version: "0.12.13"  # Released on 2026-09-10
-
-      # Ensure that dependencies and dependency groups are consistent and resolvable.
-      - run: uv sync --all-extras --all-groups --dry-run

From d917445b7a930eb32048d84c28237c89d04bcf8d Mon Sep 17 00:00:00 2001
From: Daniele Nicolodi <daniele@grinta.net>
Date: Tue, 15 Sep 2026 21:34:49 +0200
Subject: [PATCH 3/4] foo

---
 .github/workflows/debug.yml |  2 +-
 mesonpy/_windows.py         | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/debug.yml b/.github/workflows/debug.yml
index c2ad89013..4354712a7 100644
--- a/.github/workflows/debug.yml
+++ b/.github/workflows/debug.yml
@@ -49,4 +49,4 @@ jobs:
 
       - run: python -c 'import sysconfig; print(sysconfig.get_platform())'
       - run: python -c 'import platform; print(platform.machine())'
-      - run: python -c 'import mesonpy._windows as w; print(w.platform())'
+      - run: python -c 'import mesonpy._windows as w; print(w.platform()); print(w.pp())'
diff --git a/mesonpy/_windows.py b/mesonpy/_windows.py
index 6083edaec..5ce4a6c53 100644
--- a/mesonpy/_windows.py
+++ b/mesonpy/_windows.py
@@ -34,3 +34,13 @@ def platform():
         raise ctypes.WinError(ctypes.get_last_error())
     
     return native.value, process.value, MACHINE[native.value], MACHINE[process.value]
+
+
+def pp():
+    import subprocess
+
+    result = subprocess.run(
+        ["powershell", "-NoProfile", "-Command", "(Get-CimInstance Win32_Processor).Architecture"],
+        capture_output=True, text=True, check=True)
+
+    return result

From 5f77065f2657f159db39862bd2d5333bd0c18dc4 Mon Sep 17 00:00:00 2001
From: Daniele Nicolodi <daniele@grinta.net>
Date: Tue, 15 Sep 2026 21:50:32 +0200
Subject: [PATCH 4/4] debug

---
 .github/workflows/debug.yml | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/.github/workflows/debug.yml b/.github/workflows/debug.yml
index 4354712a7..4a3cd21a7 100644
--- a/.github/workflows/debug.yml
+++ b/.github/workflows/debug.yml
@@ -26,14 +26,19 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os:
-          - windows-11-arm
-        python:
-          - '3.14'
-        architecture:
-          - x64
-          - arm64
-          
+        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: