Update setup.py

Author: alexlib

setup.py

@@ -26,18 +26,23 @@ def _parse_csv_env(name, default_value):
 if sys.platform == "win32":
     extra_compile_args.extend(["/O2"])
 else:
-    extra_compile_args.extend(["-O3", "-std=c++11"])
+    extra_compile_args.extend(["-O3"])
 
 extra_compile_args.extend(_parse_csv_env("EASYSBA_EXTRA_COMPILE_ARGS", ""))
 
+# C++ specific flags - setuptools will apply these only to C++ files
+extra_cxx_compile_args = extra_compile_args.copy()
+if sys.platform != "win32":
+    extra_cxx_compile_args.append("-std=c++11")
+
 ext_modules = [
     Extension(
         "easysba._easysba",
         sources=sources,
         include_dirs=[pybind11.get_include(), "src"],
         language="c++",
         libraries=libraries,
-        extra_compile_args=extra_compile_args,
+        extra_compile_args=extra_cxx_compile_args,
     )
 ]