From 7519001ae6cf9da781da465c561870680f3c955d Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 4 Oct 2023 13:59:10 -0400
Subject: cmStandardLevelResolver: Add method to get feature standard level

---
 Source/cmStandardLevelResolver.cxx | 17 ++++++++++++++---
 Source/cmStandardLevelResolver.h   |  6 ++++++
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/Source/cmStandardLevelResolver.cxx b/Source/cmStandardLevelResolver.cxx
index 41dd316..a24d480 100644
--- a/Source/cmStandardLevelResolver.cxx
+++ b/Source/cmStandardLevelResolver.cxx
@@ -349,7 +349,7 @@ struct StandardLevelComputer
     }
 
     cm::optional<cmStandardLevel> needed =
-      this->HighestStandardNeeded(makefile, feature);
+      this->CompileFeatureStandardLevel(makefile, feature);
 
     cmValue existingStandard = currentLangStandardValue;
     if (!existingStandard) {
@@ -437,13 +437,13 @@ struct StandardLevelComputer
     }
 
     cm::optional<cmStandardLevel> needed =
-      this->HighestStandardNeeded(makefile, feature);
+      this->CompileFeatureStandardLevel(makefile, feature);
 
     return !needed ||
       (this->Levels.begin() + needed->Index()) <= existingLevelIter;
   }
 
-  cm::optional<cmStandardLevel> HighestStandardNeeded(
+  cm::optional<cmStandardLevel> CompileFeatureStandardLevel(
     cmMakefile* makefile, std::string const& feature) const
   {
     std::string prefix = cmStrCat("CMAKE_", this->Language);
@@ -652,6 +652,17 @@ bool cmStandardLevelResolver::CompileFeatureKnown(
   return false;
 }
 
+cm::optional<cmStandardLevel>
+cmStandardLevelResolver::CompileFeatureStandardLevel(
+  std::string const& lang, std::string const& feature) const
+{
+  auto mapping = StandardComputerMapping.find(lang);
+  if (mapping == cm::cend(StandardComputerMapping)) {
+    return cm::nullopt;
+  }
+  return mapping->second.CompileFeatureStandardLevel(this->Makefile, feature);
+}
+
 cmValue cmStandardLevelResolver::CompileFeaturesAvailable(
   const std::string& lang, std::string* error) const
 {
diff --git a/Source/cmStandardLevelResolver.h b/Source/cmStandardLevelResolver.h
index 03adf3f..2dd978c 100644
--- a/Source/cmStandardLevelResolver.h
+++ b/Source/cmStandardLevelResolver.h
@@ -4,10 +4,13 @@
 
 #include <string>
 
+#include <cm/optional>
+
 #include "cmValue.h"
 
 class cmMakefile;
 class cmGeneratorTarget;
+class cmStandardLevel;
 class cmTarget;
 
 class cmStandardLevelResolver
@@ -33,6 +36,9 @@ public:
                            const std::string& feature, std::string& lang,
                            std::string* error) const;
 
+  cm::optional<cmStandardLevel> CompileFeatureStandardLevel(
+    std::string const& lang, std::string const& feature) const;
+
   cmValue CompileFeaturesAvailable(const std::string& lang,
                                    std::string* error) const;
 
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