From 95d3598e0441bd9f276be1d6b4054442aad16608 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Fri, 19 Jul 2019 06:15:03 -0400
Subject: cmGeneratorExpressionDAGChecker: Avoid const_cast

Make a member mutable to avoid casting away const of a whole object.
---
 Source/cmGeneratorExpressionDAGChecker.cxx | 4 +---
 Source/cmGeneratorExpressionDAGChecker.h   | 2 +-
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/Source/cmGeneratorExpressionDAGChecker.cxx b/Source/cmGeneratorExpressionDAGChecker.cxx
index 728f2a4..817f41e 100644
--- a/Source/cmGeneratorExpressionDAGChecker.cxx
+++ b/Source/cmGeneratorExpressionDAGChecker.cxx
@@ -68,9 +68,7 @@ void cmGeneratorExpressionDAGChecker::Initialize()
         return;
       }
     }
-    const_cast<cmGeneratorExpressionDAGChecker*>(top)
-      ->Seen[this->Target]
-      .insert(this->Property);
+    top->Seen[this->Target].insert(this->Property);
   }
 }
 
diff --git a/Source/cmGeneratorExpressionDAGChecker.h b/Source/cmGeneratorExpressionDAGChecker.h
index e1fba5e..6d7d6ef 100644
--- a/Source/cmGeneratorExpressionDAGChecker.h
+++ b/Source/cmGeneratorExpressionDAGChecker.h
@@ -88,7 +88,7 @@ private:
   const cmGeneratorExpressionDAGChecker* const Parent;
   cmGeneratorTarget const* Target;
   const std::string Property;
-  std::map<cmGeneratorTarget const*, std::set<std::string>> Seen;
+  mutable std::map<cmGeneratorTarget const*, std::set<std::string>> Seen;
   const GeneratorExpressionContent* const Content;
   const cmListFileBacktrace Backtrace;
   Result CheckResult;
-- 
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