python: fix compilation of DPsim extension in debug mode via setuptools

setup.py

@@ -36,17 +36,19 @@ class CMakeBuild(build_ext):
                       '-DBUILD_EXAMPLES=OFF']
 
         cfg = 'Debug' if self.debug else 'Release'
-        build_args = ['--config', cfg]
+        cmake_args = ['-DCMAKE_BUILD_TYPE=' + cfg]
+
+        print("building CMake extension in %s configuration" % cfg)
 
         if platform.system() == "Windows":
             cmake_args += ['-DCMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG=' + extdir]
             cmake_args += ['-DCMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE=' + extdir]
             if sys.maxsize > 2**32:
                 cmake_args += ['-A', 'x64']
-            build_args += ['--', '/m']
+            build_args = ['--', '/m']
         else:
             cmake_args += ['-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=' + extdir]
-            build_args += ['--', '-j4']
+            build_args = ['--', '-j4']
 
         env = os.environ.copy()
         env['CXXFLAGS'] = '{} -DVERSION_INFO=\\"{}\\"'.format(env.get('CXXFLAGS', ''), self.distribution.get_version())