cmState: Move ProjectName from cmMakefile.

Source/cmMakefile.cxx

@@ -1525,7 +1525,7 @@ void cmMakefile::InitializeFromParent(cmMakefile* parent)
                     parent->GetProperty("LINK_DIRECTORIES"));
 
   // the initial project name
-  this->ProjectName = parent->ProjectName;
+  this->SetProjectName(parent->GetProjectName());
 
   // Copy include regular expressions.
   this->ComplainFileRegularExpression = parent->ComplainFileRegularExpression;
@@ -2046,12 +2046,12 @@ void cmMakefile::RemoveCacheDefinition(const std::string& name)
 
 void cmMakefile::SetProjectName(std::string const& p)
 {
-  this->ProjectName = p;
+  this->StateSnapshot.SetProjectName(p);
 }
 
 std::string cmMakefile::GetProjectName() const
 {
-  return this->ProjectName.c_str();
+  return this->StateSnapshot.GetProjectName();
 }
 
 void cmMakefile::AddGlobalLinkInformation(const std::string& name,

Source/cmMakefile.h

@@ -810,8 +810,6 @@ protected:
 
   mutable std::set<cmListFileContext> CMP0054ReportedIds;
 
-  std::string ProjectName;    // project name
-
   // libraries, classes, and executables
   mutable cmTargets Targets;
 #if defined(CMAKE_BUILD_WITH_CMAKE)

Source/cmState.cxx

@@ -75,6 +75,8 @@ struct cmState::BuildsystemDirectoryStateType
   std::vector<std::string> CompileOptions;
   std::vector<cmListFileBacktrace> CompileOptionsBacktraces;
 
+  std::string ProjectName;
+
   cmPropertyMap Properties;
 };
 
@@ -1312,6 +1314,16 @@ cmState::Directory cmState::Snapshot::GetDirectory() const
   return Directory(this->Position->BuildSystemDirectory, *this);
 }
 
+void cmState::Snapshot::SetProjectName(const std::string& name)
+{
+  this->Position->BuildSystemDirectory->ProjectName = name;
+}
+
+std::string cmState::Snapshot::GetProjectName() const
+{
+  return this->Position->BuildSystemDirectory->ProjectName;
+}
+
 cmState::Directory::Directory(
     cmLinkedTree<BuildsystemDirectoryStateType>::iterator iter,
     const cmState::Snapshot& snapshot)

Source/cmState.h

@@ -86,6 +86,9 @@ public:
 
     Directory GetDirectory() const;
 
+    void SetProjectName(std::string const& name);
+    std::string GetProjectName() const;
+
     struct StrictWeakOrder
     {
       bool operator()(const cmState::Snapshot& lhs,