From 5f860ebb67e86e0aa407e26ddf79652f73742211 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Tue, 24 Nov 2015 15:00:47 -0500
Subject: cmState: Avoid accumulating snapshot storage for short-lived scopes

We need to keep only certain snapshot types and their ancestors.
Also keep those needed for backtraces.
---
 Source/cmListFileCache.cxx | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'Source/cmListFileCache.cxx')

diff --git a/Source/cmListFileCache.cxx b/Source/cmListFileCache.cxx
index 676074fddb..1465f907be 100644
--- a/Source/cmListFileCache.cxx
+++ b/Source/cmListFileCache.cxx
@@ -403,6 +403,10 @@ cmListFileBacktrace::cmListFileBacktrace(cmState::Snapshot snapshot,
   : Context(cc)
   , Snapshot(snapshot)
 {
+  if (this->Snapshot.IsValid())
+    {
+    this->Snapshot.Keep();
+    }
 }
 
 cmListFileBacktrace::~cmListFileBacktrace()
-- 
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