From 604993248fdee0bec8ab8c74c1173c67496a7dfd Mon Sep 17 00:00:00 2001
From: Marc Chevrier <marc.chevrier@gmail.com>
Date: Mon, 15 Aug 2022 17:05:12 +0200
Subject: cmMakefile::VariablePushPop: helper class to manage variable scopes

---
 Source/cmMakefile.cxx | 13 +++++++++++++
 Source/cmMakefile.h   | 14 ++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index 208d907..b228e2b 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -4543,6 +4543,19 @@ bool cmMakefile::SetPolicyVersion(std::string const& version_min,
                                         cmPolicies::WarnCompat::On);
 }
 
+cmMakefile::VariablePushPop::VariablePushPop(cmMakefile* m)
+  : Makefile(m)
+{
+  this->Makefile->StateSnapshot =
+    this->Makefile->GetState()->CreateVariableScopeSnapshot(
+      this->Makefile->StateSnapshot);
+}
+
+cmMakefile::VariablePushPop::~VariablePushPop()
+{
+  this->Makefile->PopSnapshot();
+}
+
 bool cmMakefile::HasCMP0054AlreadyBeenReported(
   cmListFileContext const& context) const
 {
diff --git a/Source/cmMakefile.h b/Source/cmMakefile.h
index 0198ec1..10432a8 100644
--- a/Source/cmMakefile.h
+++ b/Source/cmMakefile.h
@@ -376,6 +376,20 @@ public:
   };
   friend class PolicyPushPop;
 
+  /** Helper class to push and pop variables scopes automatically. */
+  class VariablePushPop
+  {
+  public:
+    VariablePushPop(cmMakefile* m);
+    ~VariablePushPop();
+
+    VariablePushPop(VariablePushPop const&) = delete;
+    VariablePushPop& operator=(VariablePushPop const&) = delete;
+
+  private:
+    cmMakefile* Makefile;
+  };
+
   /**
    * Determine if the given context, name pair has already been reported
    * in context of CMP0054.
-- 
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