try_compile(): Pass down CMAKE_EXPERIMENTAL_* feature flags

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;

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]) ==

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;
   };