cmLocalGenerator: Require a valid cmState::Snapshot in the ctor.

Refactor the local generator creation API to accept a
cmState::Snapshot.  Adjust MakeLocalGenerator to use the 'current'
snapshot in cases where there is no parent.  Create the snapshot
for subdirectories in cmMakefile::AddSubdirectory.

This means that snapshots are now created at the point of extending the tree,
as appropriate, and independently of the cmLocalGenerator and cmMakefile they
represent the state for.

1 files changed, 2 insertions, 1 deletions

diff --git a/Source/cmGlobalGhsMultiGenerator.h b/Source/cmGlobalGhsMultiGenerator.h
index 8b7ecf8..f1a3ed7 100644
--- a/Source/cmGlobalGhsMultiGenerator.h
+++ b/Source/cmGlobalGhsMultiGenerator.h
@@ -31,7 +31,8 @@ public:
   { return new cmGlobalGeneratorSimpleFactory<cmGlobalGhsMultiGenerator>(); }
 
   ///! create the correct local generator
-  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent = 0);
+  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent,
+                                                 cmState::Snapshot snapshot);
 
   /// @return the name of this generator.
   static std::string GetActualName() { return "Green Hills MULTI"; }