Re: Is C++11 to be default for GCC 4.9?

[Florian Weimer <fweimer at redhat dot com>]

On 01/26/2014 05:17 PM, Richard Sandiford wrote:
> Marc Glisse <marc.glisse@inria.fr> writes:
> > > I got an error that implies that "auto" is not usable, which would
> > > mean that C++11 is not enabled, but I also got a warning that implied
> > > that gnu++11 is "enabled by default".
> > >
> > > > error: âxdirâ does not name a type
> > >
> > > > warning: non-static data member initializers only available with
> > > > -std=c++11 or -std=gnu++11 [enabled by default]
> > >
> > > Or does the "enabled by default" bit mean something other than I think
> > > it means?
> >
> > It is the warning that is enabled by default (in other messages you would
> > see [-Wunused] or [-Wformat] etc to tell you which option controls this
> > warning).
>
> I can definitely sympathise with reading the message the other way though.
> If that's the only output you see, the natural assumption is that the
> "enabled by default" applies to the thing just before it.
>
> Any objections to changing it to "this warning is enabled by default"
> or "warning enabled by default"?  Or is that too verbose?

We should show the flag that enables the warning, so that users can use 
the -Wno- variant to disable it if they want.  Or does "enabled by 
default" mean that no such -Wno- flag exists?

--
Florian Weimer / Red Hat Product Security Team