winegcc: wait when temp file already exists

In some obscure cases a file get built twice (with equal environment
and arguments) so that temp file exists in a parallel build. The
solution to this is to wait some time (12 * 5sec), hoping that the other
process is done and release the filename.

Signed-off-by: Marko Semet <marko@marko10-000.de>

tools/winegcc/utils.c

@@ -428,7 +428,19 @@ int pseudorandom_tempfile(char* file)
     }
 
     /* try to open file */
-    return open(file, O_CREAT | O_EXCL | O_RDWR, 0600);
+    int result;
+    int counter = 0;
+    do
+    {
+        result = open(file, O_CREAT | O_EXCL | O_RDWR, 0600);
+        if (result != -1)
+        {
+            break;
+        }
+        sleep(5);
+        counter++;
+    } while (counter <= 12);
+    return result;
 }
 
 void init_random_generator(int argc, char **argv)