From c2d1d958091c4cc4c7fc362fbf61a03623fba3b9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matthias=20M=C3=B6ller?= <m_moeller@live.de>
Date: Tue, 31 Jan 2017 16:54:49 +0100
Subject: [PATCH] Update common.h (#606)

fixed VS build, when _DEBUG is just defined without any value assigned (e.g. VS15)
---
 include/pybind11/common.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/pybind11/common.h b/include/pybind11/common.h
index a0894ead..ecd326c1 100644
--- a/include/pybind11/common.h
+++ b/include/pybind11/common.h
@@ -61,7 +61,7 @@
 #  define HAVE_ROUND
 #  pragma warning(push)
 #  pragma warning(disable: 4510 4610 4512 4005)
-#  if _DEBUG
+#  if defined(_DEBUG)
 #    define PYBIND11_DEBUG_MARKER
 #    undef _DEBUG
 #  endif