diff --git a/Source/cmGeneratorExpression.cxx b/Source/cmGeneratorExpression.cxx
index f0dcde7a47..f35ee52e5f 100644
--- a/Source/cmGeneratorExpression.cxx
+++ b/Source/cmGeneratorExpression.cxx
@@ -43,7 +43,7 @@ std::unique_ptr<cmCompiledGeneratorExpression> cmGeneratorExpression::Parse(
 }
 
 std::string cmGeneratorExpression::Evaluate(
-  std::string input, cmLocalGenerator* lg, std::string const& config,
+  std::string input, cmLocalGenerator const* lg, std::string const& config,
   cmGeneratorTarget const* headTarget,
   cmGeneratorExpressionDAGChecker* dagChecker,
   cmGeneratorTarget const* currentTarget, std::string const& language)
@@ -63,7 +63,7 @@ std::string cmGeneratorExpression::Evaluate(
 }
 
 std::string const& cmCompiledGeneratorExpression::Evaluate(
-  cmLocalGenerator* lg, std::string const& config,
+  cmLocalGenerator const* lg, std::string const& config,
   cmGeneratorTarget const* headTarget,
   cmGeneratorExpressionDAGChecker* dagChecker,
   cmGeneratorTarget const* currentTarget, std::string const& language) const
diff --git a/Source/cmGeneratorExpression.h b/Source/cmGeneratorExpression.h
index 3ffc39d3b5..e5269b1d99 100644
--- a/Source/cmGeneratorExpression.h
+++ b/Source/cmGeneratorExpression.h
@@ -46,7 +46,7 @@ public:
     std::string input) const;
 
   static std::string Evaluate(
-    std::string input, cmLocalGenerator* lg, std::string const& config,
+    std::string input, cmLocalGenerator const* lg, std::string const& config,
     cmGeneratorTarget const* headTarget = nullptr,
     cmGeneratorExpressionDAGChecker* dagChecker = nullptr,
     cmGeneratorTarget const* currentTarget = nullptr,
@@ -103,7 +103,7 @@ public:
     cmCompiledGeneratorExpression const&) = delete;
 
   std::string const& Evaluate(
-    cmLocalGenerator* lg, std::string const& config,
+    cmLocalGenerator const* lg, std::string const& config,
     cmGeneratorTarget const* headTarget = nullptr,
     cmGeneratorExpressionDAGChecker* dagChecker = nullptr,
     cmGeneratorTarget const* currentTarget = nullptr,
@@ -185,7 +185,7 @@ private:
 class cmGeneratorExpressionInterpreter
 {
 public:
-  cmGeneratorExpressionInterpreter(cmLocalGenerator* localGenerator,
+  cmGeneratorExpressionInterpreter(cmLocalGenerator const* localGenerator,
                                    std::string config,
                                    cmGeneratorTarget const* headTarget,
                                    std::string language = std::string())
@@ -208,7 +208,7 @@ public:
 protected:
   cmGeneratorExpression GeneratorExpression;
   std::unique_ptr<cmCompiledGeneratorExpression> CompiledGeneratorExpression;
-  cmLocalGenerator* LocalGenerator = nullptr;
+  cmLocalGenerator const* LocalGenerator = nullptr;
   std::string Config;
   cmGeneratorTarget const* HeadTarget = nullptr;
   std::string Language;
diff --git a/Source/cmGeneratorExpressionContext.cxx b/Source/cmGeneratorExpressionContext.cxx
index a934717582..21d45b987c 100644
--- a/Source/cmGeneratorExpressionContext.cxx
+++ b/Source/cmGeneratorExpressionContext.cxx
@@ -5,7 +5,7 @@
 #include <utility>
 
 cmGeneratorExpressionContext::cmGeneratorExpressionContext(
-  cmLocalGenerator* lg, std::string config, bool quiet,
+  cmLocalGenerator const* lg, std::string config, bool quiet,
   cmGeneratorTarget const* headTarget, cmGeneratorTarget const* currentTarget,
   bool evaluateForBuildsystem, cmListFileBacktrace backtrace,
   std::string language)
diff --git a/Source/cmGeneratorExpressionContext.h b/Source/cmGeneratorExpressionContext.h
index d0134775c7..20ce592890 100644
--- a/Source/cmGeneratorExpressionContext.h
+++ b/Source/cmGeneratorExpressionContext.h
@@ -13,7 +13,7 @@ class cmLocalGenerator;
 
 struct cmGeneratorExpressionContext
 {
-  cmGeneratorExpressionContext(cmLocalGenerator* lg, std::string config,
+  cmGeneratorExpressionContext(cmLocalGenerator const* lg, std::string config,
                                bool quiet, cmGeneratorTarget const* headTarget,
                                cmGeneratorTarget const* currentTarget,
                                bool evaluateForBuildsystem,
@@ -27,7 +27,7 @@ struct cmGeneratorExpressionContext
   std::set<cmGeneratorTarget const*> SourceSensitiveTargets;
   std::map<cmGeneratorTarget const*, std::map<std::string, std::string>>
     MaxLanguageStandard;
-  cmLocalGenerator* LG;
+  cmLocalGenerator const* LG;
   std::string Config;
   std::string Language;
   // The target whose property is being evaluated.
diff --git a/Source/cmGeneratorExpressionNode.cxx b/Source/cmGeneratorExpressionNode.cxx
index ed61993efe..90bb06be86 100644
--- a/Source/cmGeneratorExpressionNode.cxx
+++ b/Source/cmGeneratorExpressionNode.cxx
@@ -52,7 +52,7 @@
 #include "cmake.h"
 
 std::string cmGeneratorExpressionNode::EvaluateDependentExpression(
-  std::string const& prop, cmLocalGenerator* lg,
+  std::string const& prop, cmLocalGenerator const* lg,
   cmGeneratorExpressionContext* context, cmGeneratorTarget const* headTarget,
   cmGeneratorExpressionDAGChecker* dagChecker,
   cmGeneratorTarget const* currentTarget)
@@ -2337,7 +2337,7 @@ static const struct CompileLanguageNode : public cmGeneratorExpressionNode
       return std::string();
     }
 
-    cmGlobalGenerator* gg = context->LG->GetGlobalGenerator();
+    cmGlobalGenerator const* gg = context->LG->GetGlobalGenerator();
     std::string genName = gg->GetName();
     if (genName.find("Makefiles") == std::string::npos &&
         genName.find("Ninja") == std::string::npos &&
@@ -2387,7 +2387,7 @@ static const struct CompileLanguageAndIdNode : public cmGeneratorExpressionNode
         "add_custom_target, or file(GENERATE) commands.");
       return std::string();
     }
-    cmGlobalGenerator* gg = context->LG->GetGlobalGenerator();
+    cmGlobalGenerator const* gg = context->LG->GetGlobalGenerator();
     std::string genName = gg->GetName();
     if (genName.find("Makefiles") == std::string::npos &&
         genName.find("Ninja") == std::string::npos &&
@@ -2441,7 +2441,7 @@ static const struct LinkLanguageNode : public cmGeneratorExpressionNode
       return std::string();
     }
 
-    cmGlobalGenerator* gg = context->LG->GetGlobalGenerator();
+    cmGlobalGenerator const* gg = context->LG->GetGlobalGenerator();
     std::string genName = gg->GetName();
     if (genName.find("Makefiles") == std::string::npos &&
         genName.find("Ninja") == std::string::npos &&
@@ -2532,7 +2532,7 @@ static const struct LinkLanguageAndIdNode : public cmGeneratorExpressionNode
       return std::string();
     }
 
-    cmGlobalGenerator* gg = context->LG->GetGlobalGenerator();
+    cmGlobalGenerator const* gg = context->LG->GetGlobalGenerator();
     std::string genName = gg->GetName();
     if (genName.find("Makefiles") == std::string::npos &&
         genName.find("Ninja") == std::string::npos &&
@@ -3149,7 +3149,7 @@ static const struct TargetObjectsNode : public cmGeneratorExpressionNode
       reportError(context, content->GetOriginalExpression(), e.str());
       return std::string();
     }
-    cmGlobalGenerator* gg = context->LG->GetGlobalGenerator();
+    cmGlobalGenerator const* gg = context->LG->GetGlobalGenerator();
     {
       std::string reason;
       if (!context->EvaluateForBuildsystem &&
@@ -3523,7 +3523,7 @@ struct TargetFilesystemArtifactDependencyCMP0112
                             cmGeneratorExpressionContext* context)
   {
     context->AllTargets.insert(target);
-    cmLocalGenerator* lg = context->LG;
+    cmLocalGenerator const* lg = context->LG;
     switch (target->GetPolicyStatusCMP0112()) {
       case cmPolicies::WARN:
         if (lg->GetMakefile()->PolicyOptionalWarningEnabled(
diff --git a/Source/cmGeneratorExpressionNode.h b/Source/cmGeneratorExpressionNode.h
index 865f71cbe3..df4ee5fdbd 100644
--- a/Source/cmGeneratorExpressionNode.h
+++ b/Source/cmGeneratorExpressionNode.h
@@ -46,7 +46,7 @@ struct cmGeneratorExpressionNode
     cmGeneratorExpressionDAGChecker* dagChecker) const = 0;
 
   static std::string EvaluateDependentExpression(
-    std::string const& prop, cmLocalGenerator* lg,
+    std::string const& prop, cmLocalGenerator const* lg,
     cmGeneratorExpressionContext* context, cmGeneratorTarget const* headTarget,
     cmGeneratorExpressionDAGChecker* dagChecker,
     cmGeneratorTarget const* currentTarget);