* Re: proposal: drop support for ada on tru64-alpha
@ 2004-08-31 18:44 Richard Kenner
0 siblings, 0 replies; 7+ messages in thread
From: Richard Kenner @ 2004-08-31 18:44 UTC (permalink / raw)
To: wilson; +Cc: gcc
Follow the pointer to PR 13750. The patch that makes PCH work breaks
Ada. So we have to choose between PCH or Ada. Unless someone is
willing and able to spend some time figuring out why Ada is broken with
the patch, so that we can have both.
I've seen miscomparisons of b_gnatb.o randomly occuring on other machines
as well. My inclination is to feel this is not a code generation problem
nor unique to Alpha, but most likely some sort of uninitializd variable.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: proposal: drop support for ada on tru64-alpha
2004-08-31 21:54 ` Geoff Keating
@ 2004-09-01 7:58 ` Arnaud Charlet
0 siblings, 0 replies; 7+ messages in thread
From: Arnaud Charlet @ 2004-09-01 7:58 UTC (permalink / raw)
To: Geoff Keating
Cc: Arnaud Charlet, Geert Bosch, Rainer Orth, Robert Dewar,
Richard Henderson, gcc List
> The problem is that when you apply the patch from bugzilla, which is
> not specific to either Ada, C++, or Tru64, the bootstrap failure
> described in 13750 appears, a miscompare in Ada.
Trouble is that this is very possibly not specific to alpha-tru64 (see
Richard's comment), so for me this is a strong argument in favor of *not*
hiding this latent bug.
> So, Arnaud, do you have access to an Alpha-tru64 system with Ada?
> Would you be willing to investigate this bug?
Unfortunately not. To be honest, I could have access to an alpha-tru64 machine,
but I don't have the middle/back-end knowledge (I am a front-end and run-time
expert, I only have basic knowledge of the back-end) to investigate.
Arno
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: proposal: drop support for ada on tru64-alpha
2004-08-31 10:24 ` Arnaud Charlet
2004-08-31 18:34 ` James E Wilson
@ 2004-08-31 21:54 ` Geoff Keating
2004-09-01 7:58 ` Arnaud Charlet
1 sibling, 1 reply; 7+ messages in thread
From: Geoff Keating @ 2004-08-31 21:54 UTC (permalink / raw)
To: Arnaud Charlet
Cc: Geert Bosch, Rainer Orth, Robert Dewar, Richard Henderson, gcc List
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On 31/08/2004, at 2:42 AM, Arnaud Charlet wrote:
>> My proposal is to disable Ada in the toplevel configure for
>> tru64-alpha, and fix the bug. I would do this in mainline; Mark may
>> choose to do this in 3.4 as well, since the bug is targeted at 3.4.3.
>>
>> Any objections? If you do have objections, are you willing and able
>> to
>> debug the problem? If so, when would you expect to be able to do it?
>
> I must say I can't find from the bugzilla comments what is the
> relationship
> between this PR and Ada builds, in particular since this PR seems to
> be g++ specific.
>
> In any case, if the issue is related to PCH on alpha-tru64, then we
> should
> disable pch on alpha-tru64, and not Ada.
No, the problem is not related to PCH on Alpha-tru64. I don't know if
PCH even works on that platform. I would characterise the problem as
"I made some change to GCC and it triggered a latent bug on
Alpha-tru64."
> In general I would object to disabling Ada on alpha-tru64 on these
> grounds,
> this will only give this PR an even lower priority.
>
> Now, I feel that I do not all the information at hand, so more
> justification
> would be needed here to help me understand the issue at hand (and once
> I understand the issue better, I'd guess there will be better
> solutions than
> simply disabling Ada).
The problem is that when you apply the patch from bugzilla, which is
not specific to either Ada, C++, or Tru64, the bootstrap failure
described in 13750 appears, a miscompare in Ada.
So, Arnaud, do you have access to an Alpha-tru64 system with Ada?
Would you be willing to investigate this bug?
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: proposal: drop support for ada on tru64-alpha
2004-08-31 10:24 ` Arnaud Charlet
@ 2004-08-31 18:34 ` James E Wilson
2004-08-31 21:54 ` Geoff Keating
1 sibling, 0 replies; 7+ messages in thread
From: James E Wilson @ 2004-08-31 18:34 UTC (permalink / raw)
To: Arnaud Charlet
Cc: Geert Bosch, Robert Dewar, Richard Henderson, gcc List, Rainer Orth
Arnaud Charlet wrote:
> I must say I can't find from the bugzilla comments what is the relationship
> between this PR and Ada builds, in particular since this PR seems to
> be g++ specific.
Follow the pointer to PR 13750. The patch that makes PCH work breaks
Ada. So we have to choose between PCH or Ada. Unless someone is
willing and able to spend some time figuring out why Ada is broken with
the patch, so that we can have both.
--
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: proposal: drop support for ada on tru64-alpha
2004-08-30 18:02 Geoff Keating
2004-08-30 18:38 ` Richard Henderson
@ 2004-08-31 10:24 ` Arnaud Charlet
2004-08-31 18:34 ` James E Wilson
2004-08-31 21:54 ` Geoff Keating
1 sibling, 2 replies; 7+ messages in thread
From: Arnaud Charlet @ 2004-08-31 10:24 UTC (permalink / raw)
To: Geoff Keating
Cc: Arnaud Charlet, Geert Bosch, Robert Dewar, Richard Henderson,
gcc List, Rainer Orth
> My proposal is to disable Ada in the toplevel configure for
> tru64-alpha, and fix the bug. I would do this in mainline; Mark may
> choose to do this in 3.4 as well, since the bug is targeted at 3.4.3.
>
> Any objections? If you do have objections, are you willing and able to
> debug the problem? If so, when would you expect to be able to do it?
I must say I can't find from the bugzilla comments what is the relationship
between this PR and Ada builds, in particular since this PR seems to
be g++ specific.
In any case, if the issue is related to PCH on alpha-tru64, then we should
disable pch on alpha-tru64, and not Ada.
In general I would object to disabling Ada on alpha-tru64 on these grounds,
this will only give this PR an even lower priority.
Now, I feel that I do not all the information at hand, so more justification
would be needed here to help me understand the issue at hand (and once
I understand the issue better, I'd guess there will be better solutions than
simply disabling Ada).
Arno
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: proposal: drop support for ada on tru64-alpha
2004-08-30 18:02 Geoff Keating
@ 2004-08-30 18:38 ` Richard Henderson
2004-08-31 10:24 ` Arnaud Charlet
1 sibling, 0 replies; 7+ messages in thread
From: Richard Henderson @ 2004-08-30 18:38 UTC (permalink / raw)
To: Geoff Keating
Cc: Arnaud Charlet, Geert Bosch, Robert Dewar, gcc List, Rainer Orth
On Mon, Aug 30, 2004 at 10:44:33AM -0700, Geoff Keating wrote:
> Any objections? If you do have objections, are you willing and able to
> debug the problem? If so, when would you expect to be able to do it?
No objections.
r~
^ permalink raw reply [flat|nested] 7+ messages in thread
* proposal: drop support for ada on tru64-alpha
@ 2004-08-30 18:02 Geoff Keating
2004-08-30 18:38 ` Richard Henderson
2004-08-31 10:24 ` Arnaud Charlet
0 siblings, 2 replies; 7+ messages in thread
From: Geoff Keating @ 2004-08-30 18:02 UTC (permalink / raw)
To: Arnaud Charlet, Geert Bosch, Robert Dewar, Richard Henderson, gcc List
Cc: Rainer Orth
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Bug 13361, <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13361>, has
been blocked for six months by a problem that appears while
bootstrapping GCC on tru64-alpha. It appears to be a bug in either the
Alpha backend or the tru64 system libraries. No-one who has both
access to tru64 and the ability to debug the problem appears willing to
help.
My proposal is to disable Ada in the toplevel configure for
tru64-alpha, and fix the bug. I would do this in mainline; Mark may
choose to do this in 3.4 as well, since the bug is targeted at 3.4.3.
Any objections? If you do have objections, are you willing and able to
debug the problem? If so, when would you expect to be able to do it?
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^ permalink raw reply [flat|nested] 7+ messages in thread
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2004-08-31 18:44 proposal: drop support for ada on tru64-alpha Richard Kenner
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2004-08-30 18:02 Geoff Keating
2004-08-30 18:38 ` Richard Henderson
2004-08-31 10:24 ` Arnaud Charlet
2004-08-31 18:34 ` James E Wilson
2004-08-31 21:54 ` Geoff Keating
2004-09-01 7:58 ` Arnaud Charlet
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