[Bug preprocessor/89738] Warn for unused macro arguments

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89738

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c                           |preprocessor

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
One of the issue is that some macro functions are designed to ignore the
argument; e.g. assert.