Makefiles: Add support for ADDITIONAL_CLEAN_FILES directory property

Source/cmMakefileTargetGenerator.cxx

@@ -172,6 +172,18 @@ void cmMakefileTargetGenerator::WriteTargetBuildRules()
     this->CleanFiles.insert(files.begin(), files.end());
   }
 
+  // Look for additional files registered for cleaning in this directory.
+  if (const char* prop_value =
+        this->Makefile->GetProperty("ADDITIONAL_CLEAN_FILES")) {
+    std::vector<std::string> const files = evaluatedFiles(prop_value);
+    // For relative path support
+    std::string const& binaryDir =
+      this->LocalGenerator->GetCurrentBinaryDirectory();
+    for (std::string const& cfl : files) {
+      this->CleanFiles.insert(cmSystemTools::CollapseFullPath(cfl, binaryDir));
+    }
+  }
+
   // add custom commands to the clean rules?
   const char* clean_no_custom = this->Makefile->GetProperty("CLEAN_NO_CUSTOM");
   bool clean = cmSystemTools::IsOff(clean_no_custom);