Index: lib/MsgUtils/cmake/MsgUtils.cmake
===================================================================
diff -u -r64243101dff61b5c1a40b96ef33080236999acf6 -r4dccc470aedf6f68a0ad73c1101f8a96188cbdb1
--- lib/MsgUtils/cmake/MsgUtils.cmake	(.../MsgUtils.cmake)	(revision 64243101dff61b5c1a40b96ef33080236999acf6)
+++ lib/MsgUtils/cmake/MsgUtils.cmake	(.../MsgUtils.cmake)	(revision 4dccc470aedf6f68a0ad73c1101f8a96188cbdb1)
@@ -93,6 +93,14 @@
     )
 
     add_custom_target(${_target_name} DEPENDS ${_output_ini})
+
+    # CMake adds every custom-command OUTPUT to the clean target. Unlike the other
+    # generated files, this INI is persistent, so a clean must not delete it.
+    # CMake offers no per-output exemption, so the directory-scoped property is required,
+    # but a side effect is that the calling directory must not rely on clean removing other
+    # custom outputs in this directory. It is ok for now since the _output_ini is the only
+    # file in the directory, but may need to be addressed later if more files are added.
+    set_directory_properties(PROPERTIES CLEAN_NO_CUSTOM TRUE)
 endfunction()
 
 #   \brief  This function adds a custom command to generate a Protobuf file from inputted message conf files