Fix build on Windows

.github/workflows/python-app.yml

@@ -65,6 +65,17 @@ jobs:
       #     # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
       #     flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
       - name: Build libmixin.a
+        if: ${{ matrix.os == 'windows-2019' }}
+        working-directory: src/mixin
+        shell: pwsh
+        run: |
+          choco install visualstudio2019buildtools --package-parameters "--add Microsoft.VisualStudio.Component.VC.Tools.x86.x64"
+          go build -o mixin.dll -buildmode=c-shared
+          copy mixin.dll ../../pysrc/mixin.dll
+          gendef mixin.dll
+          cmd /c "`"C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Auxiliary\Build\vcvars64.bat`" && lib /def:mixin.def /machine:x64 /out:mixin.lib"
+      - name: Build libmixin.a
+        if: ${{ matrix.os != 'windows-2019' }}
         working-directory: src/mixin
         run: |
           go build -o libmixin.a -buildmode=c-archive

setup.py

@@ -5,8 +5,11 @@
 from setuptools import find_packages, setup, Extension
 from Cython.Build import cythonize
 
-os.environ["CC"] = "clang"
-os.environ["CXX"] = "clang++"
+dir_name = os.path.dirname(os.path.realpath(__file__))
+
+if not platform.system() == 'Windows':
+    os.environ["CC"] = "clang"
+    os.environ["CXX"] = "clang++"
 
 # Require pytest-runner only when running tests
 pytest_runner = (['pytest-runner>=2.0,<3dev']
@@ -26,33 +29,6 @@
 version = platform.python_version_tuple()
 version = '%s.%s' % (version[0], version[1])
 
-dir_name = os.path.dirname(os.path.realpath(__file__))
-
-root_path = os.path.join(dir_name, 'src/mixin')
-def check_modification():   
-    lib_name = os.path.join(root_path, 'libmixin.a')
-    if not os.path.exists(lib_name):
-        return True
-    modify_time = os.path.getmtime(lib_name)
-    for root, dirs, files in os.walk(root_path):
-        for f in files:
-            if f[-3:] == '.go':
-                f = os.path.join(root, f)
-                file_time = os.path.getmtime(f)
-                if modify_time < file_time:
-                    return True
-    return False
-
-r = check_modification()
-if r:
-    print('mixin lib need to rebuild.')
-    os.system(f'touch {root_path}/main.go')
-
-if platform.system() == 'Windows':
-    os.system('cd ./src/mixin &&go build -o mixin.dll -buildmode=c-shared && copy mixin.dll ../../pysrc/mixin.dll && gendef mixin.dll && lib /def:mixin.def /machine:x64 /out:mixin.lib')
-else:
-    os.system('cd ./src/mixin;go build -o libmixin.a -buildmode=c-archive')
-
 ext_modules = [
     Extension(
         'pymixin._mixin',
@@ -64,7 +40,8 @@ def check_modification():
         ],
         language='c++',
         extra_compile_args=['-std=c++17'],
-        extra_link_args=['-L./src/mixin', '-lmixin'],
+        library_dirs=[os.path.join(dir_name, 'src/mixin')],
+        libraries = ['mixin']
     )
 ]