Fix removing directories

Author: isuruf

setup.py

@@ -41,14 +41,15 @@ def has_flag(compiler, flagname):
     """Return a boolean indicating whether a flag name is supported on
     the specified compiler.
     """
-    import tempfile
-    with tempfile.NamedTemporaryFile('w', suffix='.cpp', delete=False) as f:
-        f.write('int main (int argc, char **argv) { return 0; }')
-        fname = f.name
-    try:
-        compiler.compile([fname], extra_postargs=[flagname])
-    except setuptools.distutils.errors.CompileError:
-        return False
+    import tempfile, os
+    with tempfile.TemporaryDirectory() as d:
+        fname = os.path.join(d, 'main.cpp')
+        with open(fname, 'w') as f:
+            f.write('int main (int argc, char **argv) { return 0; }')
+        try:
+            compiler.compile([fname], extra_postargs=[flagname])
+        except setuptools.distutils.errors.CompileError:
+            return False
     return True