Re: GCC 4.2.0 Status Report (2007-03-04)

[Andrew MacLeod <amacleod at redhat dot com>]

On Sun, 2007-03-04 at 20:45 -0800, Mark Mitchell wrote:

> However, I do think that it's important to eliminate some of the 139
> open P2 and P1 regressions [2], especially those P1 regressions which
> did not appear in GCC 4.1.x.

There are a handful I've been involved with which are labeled as
4.0/4.1/4.2/4.3 regressions which I don't see ever being fixed in 4.0
through 4.2. There is perhaps some hope for 4.3, but 4.4 is the more
likely case. They require new development work that I think is unlikely
to ever be backported to these releases for just these testcases.   

The PRs are 
- 21596  I made a simple attempt at this one, but the simple approach
isn't going to work.  
- 23200  fixed in 4.3 by the new version of TER. Unlikely to port the
entire TER rewrite back to 4.2 at this stage (it could be done tho :-).
- 27986  This is in fact a variation of the issue in 21596, except this
one crosses basic blocks. It will require all new work to get this case.
- 27877  Mark Shinwell applied a patch for this to 4.3. I pinged him
about applying it to 4.2. If I haven't heard from him by thursday, I
will apply it friday.

I would say you can mark the first 3 as 'will not fix', or whatever you
do to indicate they aren't going to be resolved in 4.2.  When I actually
have a fix for them (or RTL optimizers fix them), we can look at what it
takes to port them back, but for this release I'd claim they are a
no-go.

Andrew