Is it possible to silence the "table of contents is empty" warning when linking a library that contains only categories?

> 
> warning:
>  /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool:
>  warning for library: {some library} for architecture: {some
>  architecture} the table of contents is empty (no object file members
>  in the library define global symbols)
> 
> 
> 

I'm aware that adding an empty class in any implementation file would remove the warning, but I would prefer not to add an artificial class.