cmState: Record buildsystem target names in each directory

Maintain in the directory state the list of target names added to be
built.  These are normal, non-imported targets (but do include INTERFACE
libraries).

Source/cmMakefile.cxx

@@ -1930,6 +1930,7 @@ cmTarget* cmMakefile::AddNewTarget(cmState::TargetType type,
         name, cmTarget(name, type, cmTarget::VisibilityNormal, this)))
       .first;
   this->GetGlobalGenerator()->IndexTarget(&it->second);
+  this->GetStateSnapshot().GetDirectory().AddNormalTargetName(name);
   return &it->second;
 }
 

Source/cmState.cxx

@@ -94,6 +94,8 @@ struct cmState::BuildsystemDirectoryStateType
   std::vector<std::string> CompileOptions;
   std::vector<cmListFileBacktrace> CompileOptionsBacktraces;
 
+  std::vector<std::string> NormalTargetNames;
+
   std::string ProjectName;
 
   cmPropertyMap Properties;
@@ -324,6 +326,7 @@ cmState::Snapshot cmState::Reset()
     it->CompileOptions.clear();
     it->CompileOptionsBacktraces.clear();
     it->DirectoryEnd = pos;
+    it->NormalTargetNames.clear();
     it->Properties.clear();
     it->Children.clear();
   }
@@ -1733,6 +1736,11 @@ std::vector<std::string> cmState::Directory::GetPropertyKeys() const
   return keys;
 }
 
+void cmState::Directory::AddNormalTargetName(std::string const& name)
+{
+  this->DirectoryState->NormalTargetNames.push_back(name);
+}
+
 bool operator==(const cmState::Snapshot& lhs, const cmState::Snapshot& rhs)
 {
   return lhs.Position == rhs.Position;

Source/cmState.h

@@ -175,6 +175,8 @@ public:
     bool GetPropertyAsBool(const std::string& prop) const;
     std::vector<std::string> GetPropertyKeys() const;
 
+    void AddNormalTargetName(std::string const& name);
+
   private:
     void ComputeRelativePathTopSource();
     void ComputeRelativePathTopBinary();