From d84681d8f068225f786453a5a77791a1eb8e5459 Mon Sep 17 00:00:00 2001
From: Kyle Edwards <kyle.edwards@kitware.com>
Date: Mon, 17 Jul 2023 14:02:33 -0400
Subject: try_compile(): Pass down CMAKE_EXPERIMENTAL_* feature flags

---
 Source/cmCoreTryCompile.cxx | 12 ++++++++++++
 Source/cmExperimental.cxx   |  1 +
 Source/cmExperimental.h     |  1 +
 3 files changed, 14 insertions(+)

diff --git a/Source/cmCoreTryCompile.cxx b/Source/cmCoreTryCompile.cxx
index 7d4ab50..586db1b 100644
--- a/Source/cmCoreTryCompile.cxx
+++ b/Source/cmCoreTryCompile.cxx
@@ -18,6 +18,7 @@
 
 #include "cmArgumentParser.h"
 #include "cmConfigureLog.h"
+#include "cmExperimental.h"
 #include "cmExportTryCompileFileGenerator.h"
 #include "cmGlobalGenerator.h"
 #include "cmList.h"
@@ -1068,6 +1069,17 @@ cm::optional<cmTryCompileResult> cmCoreTryCompile::TryCompileCode(
       cmakeVariables.emplace("CMAKE_OSX_ARCHITECTURES", *tcArchs);
     }
 
+    // Pass down CMAKE_EXPERIMENTAL_* feature flags
+    for (std::size_t i = 0;
+         i < static_cast<std::size_t>(cmExperimental::Feature::Sentinel);
+         i++) {
+      auto const& data = cmExperimental::DataForFeature(
+        static_cast<cmExperimental::Feature>(i));
+      if (data.ForwardThroughTryCompile) {
+        vars.insert(data.Variable);
+      }
+    }
+
     for (std::string const& var : vars) {
       if (cmValue val = this->Makefile->GetDefinition(var)) {
         std::string flag = "-D" + var + "=" + *val;
diff --git a/Source/cmExperimental.cxx b/Source/cmExperimental.cxx
index bdbd353..5d25f66 100644
--- a/Source/cmExperimental.cxx
+++ b/Source/cmExperimental.cxx
@@ -24,6 +24,7 @@ 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 },
 };
 static_assert(sizeof(LookupTable) / sizeof(LookupTable[0]) ==
diff --git a/Source/cmExperimental.h b/Source/cmExperimental.h
index 46c5fb7..bd84bb3 100644
--- a/Source/cmExperimental.h
+++ b/Source/cmExperimental.h
@@ -25,6 +25,7 @@ public:
     std::string const Uuid;
     std::string const Variable;
     std::string const Description;
+    bool const ForwardThroughTryCompile;
     bool Warned;
   };
 
-- 
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