ENH: big change, only allow commands access to the cache via the cmMakefile class and GetDefinition, also the cmMakefile is the only way for commands to add to the cache. Also, some changes to configure.in that check for for scoping

Source/cmUtilitySourceCommand.cxx

@@ -54,7 +54,7 @@ bool cmUtilitySourceCommand::InitialPass(std::vector<std::string>& args)
   // The first argument is the cache entry name.
   std::string cacheEntry = *arg++;
   const char* cacheValue =
-    cmCacheManager::GetInstance()->GetCacheValue(cacheEntry.c_str());
+    m_Makefile->GetDefinition(cacheEntry.c_str());
   // If it exists already, we are done.
   // unless this is Major
   if(cacheValue && 
@@ -111,20 +111,17 @@ bool cmUtilitySourceCommand::InitialPass(std::vector<std::string>& args)
     +utilityName+cmSystemTools::GetExecutableExtension();
   
   // Enter the value into the cache.
-  cmCacheManager::GetInstance()->AddCacheEntry(cacheEntry.c_str(),
-                                               utilityExecutable.c_str(),
-                                               "Path to an internal program.",
-                                               cmCacheManager::FILEPATH);
+  m_Makefile->AddCacheDefinition(cacheEntry.c_str(),
+                                 utilityExecutable.c_str(),
+                                 "Path to an internal program.",
+                                 cmCacheManager::FILEPATH);
   // add a value into the cache that maps from the
   // full path to the name of the project
   cmSystemTools::ConvertToUnixSlashes(utilityExecutable);
-  cmCacheManager::GetInstance()->AddCacheEntry(utilityExecutable.c_str(),
-                                               utilityName.c_str(),
-                                               "Executable to project name.",
-                                               cmCacheManager::INTERNAL);
-  
-  // Set the definition in the makefile.
-  m_Makefile->AddDefinition(cacheEntry.c_str(), utilityExecutable.c_str());
+  m_Makefile->AddCacheDefinition(utilityExecutable.c_str(),
+                                 utilityName.c_str(),
+                                 "Executable to project name.",
+                                 cmCacheManager::INTERNAL);
   
   return true;
 }