From 030800a78a98035a1cfd95a148395bb2c442d650 Mon Sep 17 00:00:00 2001
From: Stephen Kelly <steveire@gmail.com>
Date: Tue, 22 Oct 2013 19:29:57 +0200
Subject: cmTarget: Add a template to create correct implied content.

Otherwise, in the string case, we would get a null pointer instead
of the implied empty string. That will become relevant when the
comparison result is used.
---
 Source/cmTarget.cxx | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Source/cmTarget.cxx b/Source/cmTarget.cxx
index ad4ae0c..f84095c 100644
--- a/Source/cmTarget.cxx
+++ b/Source/cmTarget.cxx
@@ -4472,6 +4472,19 @@ bool consistentProperty(const char *lhs, const char *rhs)
   return strcmp(lhs, rhs) == 0;
 }
 
+template<typename PropertyType>
+PropertyType impliedValue(PropertyType);
+template<>
+bool impliedValue<bool>(bool)
+{
+  return false;
+}
+template<>
+const char* impliedValue<const char*>(const char*)
+{
+  return "";
+}
+
 //----------------------------------------------------------------------------
 template<typename PropertyType>
 PropertyType checkInterfacePropertyCompatibility(cmTarget *tgt,
@@ -4547,6 +4560,7 @@ PropertyType checkInterfacePropertyCompatibility(cmTarget *tgt,
       }
     else if (impliedByUse)
       {
+      propContent = impliedValue<PropertyType>(propContent);
       if (ifaceIsSet)
         {
         if (!consistentProperty(propContent, ifacePropContent))
-- 
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