Re: [PATCH] Attribute for unused warning for variables of non-trivial types

[Florian Weimer <fweimer at redhat dot com>]

On 11/08/2012 08:43 PM, Lubos Lunak wrote:

>   The patch implements an attribute for marking types for which gcc cannot on
> its own issue warnings about unused variables (e.g. because the ctor is
> external), but for which such a warning might be useful anyway (e.g.
> std::string).

I'm not sure if the default shouldn't be "warn".  RAII-only classes 
which are used purely for constructor/destructor side effects are pretty 
rare, AFAICT.

To make this useful with containers, we'd need further annotations to 
tell read and write accesses apart.  (A vector might be append-only, and 
the elements might be ignored.)

--
Florian Weimer / Red Hat Product Security Team