From 809b43956238475fe2656464202814df99a0c4ea Mon Sep 17 00:00:00 2001
From: Markus Armbruster <armbru@redhat.com>
Date: Mon, 19 Feb 2018 16:32:48 -0500
Subject: [PATCH] qapi: Generators crash when --output-dir isn't given, fix

Backports commit c4f498fe8532cdacc609262b104322911108df54 from qemu
---
 qemu/scripts/qapi.py | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/qemu/scripts/qapi.py b/qemu/scripts/qapi.py
index da929e8c..c864070a 100644
--- a/qemu/scripts/qapi.py
+++ b/qemu/scripts/qapi.py
@@ -1032,11 +1032,12 @@ def open_output(output_dir, do_c, do_h, prefix, c_file, h_file,
     c_file = output_dir + prefix + c_file
     h_file = output_dir + prefix + h_file
 
-    try:
-        os.makedirs(output_dir)
-    except os.error, e:
-        if e.errno != errno.EEXIST:
-            raise
+    if output_dir:
+        try:
+            os.makedirs(output_dir)
+        except os.error, e:
+            if e.errno != errno.EEXIST:
+                raise
 
     def maybe_open(really, name, opt):
         if really: