ENH: Enable using clang-cl on Windows

.github/workflows/clang-cl.yml

@@ -0,0 +1,43 @@
+name: Build using clang-cl on Windows
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build_wheels:
+    runs-on: windows-latest
+    name: Build wheel using clang-cl on Windows
+    strategy:
+      fail-fast: false
+      matrix:
+        python: [cp312]
+    defaults:
+      run:
+        shell: bash
+    env:
+      BUILD_COMMIT: "main"
+      CIBW_BUILD: ${{ matrix.python }}-*
+      CIBW_ARCHS_LINUX: x86_64
+      CIBW_ARCHS_MACOS: native
+      CIBW_SKIP: "pp* *-musllinux_* *-win32"
+      CIBW_TEST_REQUIRES: pytest pytest-xdist
+      CIBW_TEST_COMMAND: python -c "import randomgen; randomgen.test(['--skip-slow','-n','2'])"
+      CIBW_ENVIRONMENT: 'CC="clang-cl"'
+      MKL_NUM_THREADS: 1
+      OMP_NUM_THREADS: 1
+      OPENLAS_NUM_THREADS: 1
+
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Get clang-cl version
+        run: clang-cl --version
+
+      - name: Build wheels
+        uses: pypa/cibuildwheel@v3.2
+        with:
+          output-dir: wheelhouse
+

.github/workflows/cron-build-and-test.yml

@@ -29,6 +29,7 @@ jobs:
       CIBW_TEST_REQUIRES: pytest pytest-xdist
       CIBW_TEST_COMMAND: python -c "import randomgen; randomgen.test(['--skip-slow','-n','2'])"
       CIBW_REPAIR_WHEEL_COMMAND_LINUX: 'auditwheel repair --strip -w {dest_dir} {wheel}'
+      CIBW_BUILD_FRONTEND: 'build; args: --config-setting=setup-args=--vsenv'
       MKL_NUM_THREADS: 1
       OMP_NUM_THREADS: 1
       OPENLAS_NUM_THREADS: 1

ci/azure/azure_template_windows.yml

@@ -7,7 +7,7 @@ parameters:
   # defaults for any parameters that are not specified
   name: ''
   vmImage: ''
-  BUILD_FLAGS: ''
+  BUILD_FLAGS: '-Csetup-args=-vsenv'
 
 
 jobs:
@@ -50,12 +50,12 @@ jobs:
     displayName: 'List Configuration'
 
   - pwsh: |
-      python -m pip install -ve . --no-build-isolation
+      python -m pip install -ve . --no-build-isolation -Csetup-args=--vsenv
     displayName: 'Install (editable)'
     condition: ne(variables['cython.coverage'], 'true')
 
   - pwsh: |
-      python -m pip install -ve .  --no-build-isolation -Csetup-args=-Dcython-coverage=true
+      python -m pip install -ve .  --no-build-isolation -Csetup-args=-Dcython-coverage=true -Csetup-args=--vsenv
       python .\ci\azure\cythonize-pyx.py
     displayName: 'Install  (editable) and Transpile pyx to C for coverage'
     condition: eq(variables['cython.coverage'], 'true')

pyproject.toml

@@ -148,7 +148,7 @@ repository = "https://github.com/bashtage/randomgen"
 changelog = "https://bashtage.github.io/randomgen/change-log.html"
 
 [tool.meson-python.args]
-setup = ['--vsenv']
+
 
 [tool.setuptools_scm]
 version_file = "randomgen/_version.py"

randomgen/meson.build

@@ -65,7 +65,16 @@ cython_c_args =  ['-DNPY_NO_DEPRECATED_API=NPY_1_7_API_VERSION']
 cython_libs = []
 sse2_def = []
 if cc.get_id() == 'msvc' or cc.get_id() == 'clang-cl'
-  cython_c_args += cc.get_supported_arguments(['/Zp16','/wd4146', '/GL','/arch:SSE4.2','/arch:AVX2'])
+  cython_c_args += cc.get_supported_arguments(['/Zp16','/wd4146', '/arch:SSE4.2','/arch:AVX2'])
+
+  if cc.get_id() == 'msvc'
+    cython_c_args += cc.get_supported_arguments(['/GL'])
+   endif
+
+  if cc.get_id() == 'clang-cl'
+    cython_c_args += cc.get_supported_arguments(['-maes', '-Wno-unused-but-set-variable', '-Wno-unused-function'])
+  endif
+
   if cc.has_argument('/arch:SSE4.2')
     sse2_def += ['-DHAVE_SSE2=1']
   endif

randomgen/src/common/cpu_features.c

@@ -4,7 +4,7 @@ void feature_flags(int flags[32], int major)
 {
     int i;
 #if defined(HAVE_CPUID) && HAVE_CPUID
-#if defined(__clang__) || defined(__GNUC__)
+#if (defined(__clang__) || defined(__GNUC__)) && !defined(_MSC_VER)
     uint32_t num_ids = 0, reg  = 0, eax = 0, ebx = 0, ecx = 0, edx = 0;
     num_ids = __get_cpuid_max(0, &ebx);
     ebx = 0;

randomgen/src/common/randomgen_config.h

@@ -11,7 +11,7 @@
 /* windows msvc */
 
 #ifndef MSVCFORCEINLINE
-#ifndef _DEBUG
+#if !defined(_DEBUG) && !defined(__clang__)
 #define MSVCFORCEINLINE __forceinline
 #else
 #define MSVCFORCEINLINE