From 7d6a5e097f17720ed21fe5faac1759bf387c7880 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Mon, 2 Feb 2009 13:27:30 -0500
Subject: [PATCH] ENH: More robust property lookup

This teaches cmMakefile::GetProperty and cmake::GetProperty methods to
return NULL when the property name is NULL, making them more robust and
consistent with the behavior of cmTarget::GetProperty.
---
 Source/cmMakefile.cxx | 4 ++++
 Source/cmake.cxx      | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index fabfd3596..870fd6f48 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -3162,6 +3162,10 @@ const char *cmMakefile::GetProperty(const char* prop)
 const char *cmMakefile::GetProperty(const char* prop,
                                     cmProperty::ScopeType scope)
 {
+  if(!prop)
+    {
+    return 0;
+    }
   // watch for specific properties
   static std::string output;
   output = "";
diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index 1f7a7464b..10db0adc3 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -3606,6 +3606,10 @@ const char *cmake::GetProperty(const char* prop)
 
 const char *cmake::GetProperty(const char* prop, cmProperty::ScopeType scope)
 {
+  if(!prop)
+    {
+    return 0;
+    }
   bool chain = false;
 
   // watch for special properties