Attempt to build 32bit binaries for windows (pyocd#176)

.github/workflows/ci-build-wheel-windows.yml

@@ -9,7 +9,7 @@ jobs:
       matrix:
         os: [windows-latest]
     env:
-      CIBW_SKIP: "cp27-* cp34-* cp35-* cp36-* pp* *-win32"
+      CIBW_SKIP: "cp27-* cp34-* cp35-* cp36-* pp*"
       CIBW_BEFORE_BUILD: "python -m pip install --upgrade pip wheel setuptools setuptools_scm"
       CIBW_BUILD_VERBOSITY: 1
       RUSTFLAGS: "-Ctarget-feature=+crt-static"
@@ -23,11 +23,12 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
+          target: [x86_64-pc-windows-msvc, i686-pc-windows-msvc]
 
       - uses: actions/setup-python@v2
         name: Install Python
         with:
-          python-version: '3.7'
+          python-version: "3.7"
 
       - name: Build wheels
         uses: pypa/[email protected]

.github/workflows/ci-build-wheel.yml

@@ -45,10 +45,15 @@ jobs:
         with:
           platforms: arm64
 
+      # Assuming 64bit version is installed as default
+      - name: Install Rust i686-pc-windows-msvc
+        if: runner.os == 'Windows'
+        run: rustup target add i686-pc-windows-msvc
+
       - uses: actions/setup-python@v2
         name: Install Python
         with:
-          python-version: '3.7'
+          python-version: "3.7"
 
       - name: Build wheels
         uses: pypa/[email protected]

setup.py

@@ -16,9 +16,11 @@
 # limitations under the License.
 
 import os
-from setuptools import setup
+import platform
 from pathlib import Path
 
+from setuptools import setup
+
 # Get the directory containing this setup.py. Even though full paths are used below, we must
 # chdir in order for setuptools-scm to successfully pick up the version.
 SCRIPT_DIR = Path(__file__).resolve().parent
@@ -51,15 +53,24 @@ def build_native(spec):
             header_filename=lambda: build.find_header('cmsis.h', in_path='cmsis-cffi')
         )
     else:
+        cmd_extras = []
+        target_infix = ''
+        if platform.system() == 'Windows':
+            if platform.architecture()[0] == '64bit':
+                target_infix = 'x86_64-pc-windows-msvc'
+            else:
+                target_infix = 'i686-pc-windows-msvc'
+            cmd_extras.append(f'--target={target_infix}')
+
         build = spec.add_external_build(
-            cmd=['cargo', 'build', '--release', '--lib'],
+            cmd=['cargo', 'build', '--release', '--lib'] + cmd_extras,
             path=RUST_DIR
         )
 
         spec.add_cffi_module(
             module_path='cmsis_pack_manager._native',
             dylib=lambda: build.find_dylib('cmsis_cffi',
-                                           in_path='target/release/deps'),
+                                           in_path=f'target/{target_infix}/release/deps'),
             header_filename=lambda: build.find_header('cmsis.h', in_path='cmsis-cffi')
         )