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, 3 insertions, 2 deletions

diff --git a/Source/cmLocalGhsMultiGenerator.cxx b/Source/cmLocalGhsMultiGenerator.cxx
index 025b464..870b9b9 100644
--- a/Source/cmLocalGhsMultiGenerator.cxx
+++ b/Source/cmLocalGhsMultiGenerator.cxx
@@ -17,8 +17,9 @@
 #include "cmGeneratedFileStream.h"
 
 cmLocalGhsMultiGenerator::cmLocalGhsMultiGenerator(cmGlobalGenerator* gg,
-                                                   cmLocalGenerator* parent)
-  : cmLocalGenerator(gg, parent)
+                                                   cmLocalGenerator* parent,
+                                                   cmState::Snapshot snapshot)
+  : cmLocalGenerator(gg, parent, snapshot)
 {
 }