GenEx: Add support for custom transitive compile properties

Teach the `$<TARGET_PROPERTY:...>` generator expression to check for a
new `TRANSITIVE_COMPILE_PROPERTIES` property in the target's link
closure to enable transitive evaluation of named properties through
the link closure, excluding entries guarded by `$<LINK_ONLY:...>`.

Issue: #20416

1 files changed, 17 insertions, 0 deletions

diff --git a/Source/cmGeneratorTarget_Link.cxx b/Source/cmGeneratorTarget_Link.cxx
index 7c6f7b5..0799429 100644
--- a/Source/cmGeneratorTarget_Link.cxx
+++ b/Source/cmGeneratorTarget_Link.cxx
@@ -282,6 +282,23 @@ static void processILibs(const std::string& config,
   }
 }
 
+std::vector<cmGeneratorTarget const*>
+cmGeneratorTarget::GetLinkInterfaceClosure(std::string const& config,
+                                           cmGeneratorTarget const* headTarget,
+                                           UseTo usage) const
+{
+  cmGlobalGenerator* gg = this->GetLocalGenerator()->GetGlobalGenerator();
+  std::vector<cmGeneratorTarget const*> tgts;
+  std::set<cmGeneratorTarget const*> emitted;
+  if (cmLinkInterfaceLibraries const* iface =
+        this->GetLinkInterfaceLibraries(config, headTarget, usage)) {
+    for (cmLinkItem const& lib : iface->Libraries) {
+      processILibs(config, headTarget, lib, gg, tgts, emitted, usage);
+    }
+  }
+  return tgts;
+}
+
 const std::vector<const cmGeneratorTarget*>&
 cmGeneratorTarget::GetLinkImplementationClosure(const std::string& config,
                                                 UseTo usage) const