Merge topic 'exported-modules-with-headers' into release-3.29

2041f7c9bf cmGeneratorTarget: add the original target as a COMPILE_ONLY link
051c2110c8 Tests/CXXModules: test exporting modules which include headers

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Merge-request: !9469

Source/cmGeneratorTarget.cxx

@@ -8483,6 +8483,10 @@ bool cmGeneratorTarget::DiscoverSyntheticTargets(cmSyntheticTargetCache& cache,
         // generation.
         tgt->CopyImportedCxxModulesProperties(model);
 
+        tgt->AddLinkLibrary(*mf,
+                            cmStrCat("$<COMPILE_ONLY:", model->GetName(), '>'),
+                            GENERAL_LibraryType);
+
         // Apply usage requirements to the target.
         usage.ApplyToTarget(tgt);