From 8917b8512f20147b22ac8a7bf78245ab0162acaf Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 20 Oct 2021 11:58:39 -0400
Subject: cmGlobalVisualStudioVersionedGenerator: Allow repeating
 SetGeneratorInstance

---
 Source/cmGlobalVisualStudioVersionedGenerator.cxx | 6 ++++++
 Source/cmGlobalVisualStudioVersionedGenerator.h   | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/Source/cmGlobalVisualStudioVersionedGenerator.cxx b/Source/cmGlobalVisualStudioVersionedGenerator.cxx
index 3ecf32e..b6219a6 100644
--- a/Source/cmGlobalVisualStudioVersionedGenerator.cxx
+++ b/Source/cmGlobalVisualStudioVersionedGenerator.cxx
@@ -436,6 +436,9 @@ bool cmGlobalVisualStudioVersionedGenerator::MatchesGeneratorName(
 bool cmGlobalVisualStudioVersionedGenerator::SetGeneratorInstance(
   std::string const& i, cmMakefile* mf)
 {
+  if (this->GeneratorInstance && i == *(this->GeneratorInstance)) {
+    return true;
+  }
   if (!i.empty()) {
     if (!this->vsSetupAPIHelper.SetVSInstance(i)) {
       std::ostringstream e;
@@ -472,6 +475,9 @@ bool cmGlobalVisualStudioVersionedGenerator::SetGeneratorInstance(
                                        cmStateEnums::INTERNAL);
   }
 
+  // The selected instance may have a different MSBuild than previously found.
+  this->MSBuildCommandInitialized = false;
+
   return true;
 }
 
diff --git a/Source/cmGlobalVisualStudioVersionedGenerator.h b/Source/cmGlobalVisualStudioVersionedGenerator.h
index f07492d..691651f 100644
--- a/Source/cmGlobalVisualStudioVersionedGenerator.h
+++ b/Source/cmGlobalVisualStudioVersionedGenerator.h
@@ -8,6 +8,8 @@
 #include <memory>
 #include <string>
 
+#include <cm/optional>
+
 #include "cmGlobalVisualStudio14Generator.h"
 #include "cmVSSetupHelper.h"
 
@@ -72,4 +74,5 @@ private:
   class Factory17;
   friend class Factory17;
   mutable cmVSSetupAPIHelper vsSetupAPIHelper;
+  cm::optional<std::string> GeneratorInstance;
 };
-- 
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