1 files changed, 15 insertions, 0 deletions
diff --git a/Source/cmListFileCache.cxx b/Source/cmListFileCache.cxx
index 5050229..7ba61f3 100644
--- a/Source/cmListFileCache.cxx
+++ b/Source/cmListFileCache.cxx
@@ -398,6 +398,21 @@ bool cmListFileParser::AddArgument(cmListFileLexer_Token* token,
     }
 }
 
+cmListFileBacktrace::cmListFileBacktrace(cmState::Snapshot snapshot,
+                                         cmCommandContext const& cc)
+  : Context(cc)
+  , Snapshot(snapshot)
+{
+  if (this->Snapshot.IsValid())
+    {
+    this->Snapshot.Keep();
+    }
+}
+
+cmListFileBacktrace::~cmListFileBacktrace()
+{
+}
+
 void cmListFileBacktrace::PrintTitle(std::ostream& out) const
 {
   if (!this->Snapshot.IsValid())