RE: CIE version number vis-a-vis 000330.1

["Burton, Felix" <felix dot burton at windriver dot com>]

I believe it is necessary to change the version number since there is no way
for existing DWARF readers to skip the new CIE instructions.

If somebody would like to generate CIE information with the old version
number we have two options:

1. Refer to the old document
2. Describe what they should not use.

I think option 2) is better but more work...

Felix

> -----Original Message-----
> From: brender@gemevn.zko.dec.com [mailto:brender@gemevn.zko.dec.com]
> Sent: Thursday, April 20, 2000 1:58 PM
> To: DWARF2@corp.sgi.com; BRENDER@gemevn.zko.dec.com
> Subject: CIE version number vis-a-vis 000330.1
> 
> 
> Yesterday we approved 000330.1, which includes in part a 
> change in the CIE
> version number to 2 (from 1 in DWARF 2.0) -- but we did not 
> discuss that
> point specifically.
> 
> I question whether the version number change is really 
> necessary. Shouldn't
> it already be the case that a DWARF consumer should recognise and deal
> delicately with any CIE instruction code it does not 
> understand (whether
> vendor defined or not)? So long as we don't change the 
> encoding or meaning
> of any *existing* (V2.0) CIE instruction, it seems like 
> adding a couple new CIE
> instructions to the list should not require an increase in 
> the CIE version
> number. Am I missing something?
> 
> Ron
> 
> p.s. If that isn't quite right, perhaps an alternative is to 
> specify that the
> version number is 1 if only codes from Dwarf V2.0 are used, 
> and is 2 only
> if one of the new codes from V2.1 is actually present.
>