From: "Maciej W. Rozycki" <macro@imgtec.com>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: Carlos O'Donell <carlos@redhat.com>, <gnu-gabi@sourceware.org>,
Nick Clifton <nickc@redhat.com>
Subject: Re: RFC: Program Properties
Date: Fri, 01 Jan 2016 00:00:00 -0000 [thread overview]
Message-ID: <alpine.DEB.2.00.1610251230510.31859@tp.orcam.me.uk> (raw)
In-Reply-To: <CAMe9rOraTJt3wT9pMvHgNeGyRQG9HjH2+v4R_Pt6O9oRkJ98QA@mail.gmail.com>
On Mon, 17 Oct 2016, H.J. Lu wrote:
> > 4. A reject flag: if such annotated the ABI flag requires explicit support
> > (special handling beyond the three variants above) and linking fails if
> > it is set in any input object and the linker does know this ABI flag.
>
> "reject" isn't very clear. Is "mandatory" better?
Such property seen by the component addressed (be it the static linker,
dynamic loader or OS kernel) would cause the binary to be rejected unless
already explicitly recognised by the component. Or IOW unknown such
properties would be rejected and known ones handled as required. Hence
the name proposed.
That written, having thought about it some more, I think we don't
actually need such an explicit flag as I think we can reasonably set this
semantics as the default. That is any unknown property *not* annotated
with one of the known flags would be rejected, making an explicit "reject"
flag redundant.
> > Such annotation would of course have to be consistent across input files.
> >
> > Such ABI flag flags would allow ABIs to define new ABI flags processed
> > automatically in static linking without the need to upgrade the linker
> > each time a flag is added.
> >
> > Thoughts?
>
> Property values can be divided into ranges of different rules, including
> rules which differ from above.
I'm not sure defining fixed ranges has an advantage over using property
annotation. I think it's hard to assess beforehand how many values we may
need in each range and if we make a range allocated too narrow, then we
risk running out of entries within, whereas if we make one too broad, then
we risk running out of the allocation space. On the other hand by using
explicit property annotation we will only have consumed as much of the
allocation space as has actually been defined at any point in time.
Have I missed anything?
Maciej
next prev parent reply other threads:[~2016-10-25 11:46 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-01 0:00 H.J. Lu
2016-01-01 0:00 ` Suprateeka R Hegde
2016-01-01 0:00 ` Jose E. Marchesi
2016-01-01 0:00 ` Suprateeka R Hegde
2016-01-01 0:00 ` Jose E. Marchesi
2016-01-01 0:00 ` Suprateeka R Hegde
2016-01-01 0:00 ` Joseph Myers
2016-01-01 0:00 ` Carlos O'Donell
2016-01-01 0:00 ` H.J. Lu
2016-01-01 0:00 ` Maciej W. Rozycki
2016-01-01 0:00 ` H.J. Lu
2016-01-01 0:00 ` Nick Clifton
2016-01-01 0:00 ` H.J. Lu
2016-01-01 0:00 ` Suprateeka R Hegde
2016-01-01 0:00 ` Maciej W. Rozycki [this message]
2016-01-01 0:00 ` H.J. Lu
2016-01-01 0:00 ` H.J. Lu
2016-01-01 0:00 H.J. Lu
2016-01-01 0:00 H.J. Lu
2016-01-01 0:00 ` Suprateeka R Hegde
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