From fb45c37160e4f8d839a2c29bce80cae7563cfd3a Mon Sep 17 00:00:00 2001
From: Stephen Kelly <steveire@gmail.com>
Date: Thu, 10 Sep 2015 23:00:27 +0200
Subject: [PATCH] cmState: Only append non-empty values to buildsystem
 properties.

This is a change in behavior from CMake 3.3, but there is no semantic meaning
to empty entries in buildsystem properties.  This also restores behavior to
that of CMake 2.8.10.
---
 Source/cmState.cxx | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Source/cmState.cxx b/Source/cmState.cxx
index b66f403bc..f8971adff 100644
--- a/Source/cmState.cxx
+++ b/Source/cmState.cxx
@@ -1378,6 +1378,11 @@ template <typename T, typename U, typename V>
 void AppendEntry(T& content, U& backtraces, V& endContentPosition,
     const std::string& value, const cmListFileBacktrace& lfbt)
 {
+  if (value.empty())
+    {
+    return;
+    }
+
   assert(endContentPosition == content.size());
 
   content.push_back(value);