[Bug c++/86243] unknown attributes causing hard error

[h2+bugs at fsfe dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86243

--- Comment #2 from Hannes Hauswedell <h2+bugs at fsfe dot org> ---
(In reply to Jonathan Wakely from comment #1)
> (In reply to Hannes Hauswedell from comment #0)
> > Note that I am not even setting -Wall or -Wextra.
> 
> As documented, -Wattributes is enabled by default and you need to use
> -Wno-attributes to disable it.

Hm, IMHO this could maybe be reconsidered now that attributes are a
standardised feature of the language and the standard explicitly states:
"Any attribute-token that is not recognized by the implementation is ignored."
I think this was added precisely to make upgrades to new attributes seamless
and to support different platform-specific ones. This is not the case if they
produce warnings, especially by default.

BUT this bug report is primarily about the error and not the warning!