From 1a538ae07c5a859158e603c6075b352c5f5e294e Mon Sep 17 00:00:00 2001
From: Ben Boeckel <ben.boeckel@kitware.com>
Date: Wed, 19 Jul 2023 16:40:52 -0400
Subject: cmExperimental: use an `enum` for whether to forward to try_compile

---
 Source/cmCoreTryCompile.cxx | 3 ++-
 Source/cmExperimental.cxx   | 6 +++---
 Source/cmExperimental.h     | 8 +++++++-
 3 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/Source/cmCoreTryCompile.cxx b/Source/cmCoreTryCompile.cxx
index cddbb9b..74f0320 100644
--- a/Source/cmCoreTryCompile.cxx
+++ b/Source/cmCoreTryCompile.cxx
@@ -1077,7 +1077,8 @@ cm::optional<cmTryCompileResult> cmCoreTryCompile::TryCompileCode(
          i++) {
       auto const& data = cmExperimental::DataForFeature(
         static_cast<cmExperimental::Feature>(i));
-      if (data.ForwardThroughTryCompile) {
+      if (data.ForwardThroughTryCompile ==
+          cmExperimental::TryCompileCondition::Always) {
         vars.insert(data.Variable);
       }
     }
diff --git a/Source/cmExperimental.cxx b/Source/cmExperimental.cxx
index 51c174e..fcd215c 100644
--- a/Source/cmExperimental.cxx
+++ b/Source/cmExperimental.cxx
@@ -24,14 +24,14 @@ cmExperimental::FeatureData LookupTable[] = {
     "CMAKE_EXPERIMENTAL_CXX_MODULE_CMAKE_API",
     "CMake's C++ module support is experimental. It is meant only for "
     "experimentation and feedback to CMake developers.",
-    false, // https://gitlab.kitware.com/cmake/cmake/-/issues/25097
-    false },
+    // https://gitlab.kitware.com/cmake/cmake/-/issues/25097
+    cmExperimental::TryCompileCondition::Never, false },
   // WindowsKernelModeDriver
   { "WindowsKernelModeDriver", "5c2d848d-4efa-4529-a768-efd57171bf68",
     "CMAKE_EXPERIMENTAL_WINDOWS_KERNEL_MODE_DRIVER",
     "CMake's Windows kernel-mode driver support is experimental. It is meant "
     "only for experimentation and feedback to CMake developers.",
-    true, false },
+    cmExperimental::TryCompileCondition::Always, false },
 };
 static_assert(sizeof(LookupTable) / sizeof(LookupTable[0]) ==
                 static_cast<size_t>(cmExperimental::Feature::Sentinel),
diff --git a/Source/cmExperimental.h b/Source/cmExperimental.h
index 3374ba8..fa1982e 100644
--- a/Source/cmExperimental.h
+++ b/Source/cmExperimental.h
@@ -20,13 +20,19 @@ public:
     Sentinel,
   };
 
+  enum class TryCompileCondition
+  {
+    Always,
+    Never,
+  };
+
   struct FeatureData
   {
     std::string const Name;
     std::string const Uuid;
     std::string const Variable;
     std::string const Description;
-    bool const ForwardThroughTryCompile;
+    TryCompileCondition const ForwardThroughTryCompile;
     bool Warned;
   };
 
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