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/cmLocalVisualStudioGenerator.cxx b/Source/cmLocalVisualStudioGenerator.cxx
index f472bba..ca72939 100644
--- a/Source/cmLocalVisualStudioGenerator.cxx
+++ b/Source/cmLocalVisualStudioGenerator.cxx
@@ -20,8 +20,9 @@
 //----------------------------------------------------------------------------
 cmLocalVisualStudioGenerator
 ::cmLocalVisualStudioGenerator(cmGlobalGenerator* gg,
-                               cmLocalGenerator* parent)
-  : cmLocalGenerator(gg, parent)
+                               cmLocalGenerator* parent,
+                               cmState::Snapshot snapshot)
+  : cmLocalGenerator(gg, parent, snapshot)
 {
 }