From: Raja R Harinath <harinath@cs.umn.edu>
To: Gabriel Dos Reis <gdr@integrable-solutions.net>
Cc: Paolo Carlini <pcarlini@unitus.it>,
gcc-bugs@gcc.gnu.org, gcc@gcc.gnu.org
Subject: Re: GCC-3.2.2 bootstrap FAILURE: 1 reduce/reduce conflict in objc-parse.y
Date: Tue, 28 Jan 2003 00:03:00 -0000 [thread overview]
Message-ID: <d97kcqs0c5.fsf@bose.cs.umn.edu> (raw)
In-Reply-To: <m34r7uz1wp.fsf@uniton.integrable-solutions.net> (Gabriel Dos Reis's message of "27 Jan 2003 23:03:02 +0100")
Hi,
Gabriel Dos Reis <gdr@integrable-solutions.net> writes:
> Paolo Carlini <pcarlini@unitus.it> writes:
>
> | Gabriel Dos Reis wrote:
> |
> | >Could anyone bootstrap with Bison 1.875?
> | >
> | Just tried for you, Gaby: definitely Bison 1.875 is not ok for Objc!
>
> Thanks!
>
> I don't know whether this is a bug in objc-parse.y or a bug in Bison
> 1.875. I'll make a release note unless someone comes with a fix.
See
objc/9267: bison 1.875 doesn't like reduce/reduce errors with %expect N
It is a bug in 'objc-parse.y' (a misuse of %expect). There has
been a reduce/reduce conflict in that file for quite some time. The
comment even says so (c-parse.in):
ifobjc
%expect 32 /* shift/reduce conflicts, and 1 reduce/reduce conflict. */
end ifobjc
However, %expect, among other things, means "exactly 0 reduce/reduce
conflicts".
Older versions of bison correctly warned about finding reduce/reduce
conflicts -- thus defeating the only purpose of the %expect: avoid
warnings.
Bison 1.875 escalated the warning to an error. The CVS version of
bison has de-escalated this back to a warning.
The correct fix to the bug: kill the %expect line in objc-parse.y.
This will have no functional change. There was a warning before, and
there'll be a warning now, when you process objc-parse.y. Only now,
you aren't claiming things that aren't true.
- Hari
--
Raja R Harinath ------------------------------ harinath@cs.umn.edu
next prev parent reply other threads:[~2003-01-27 22:18 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-27 22:18 Gabriel Dos_Reis
2003-01-27 22:32 ` Gabriel Dos Reis
2003-01-27 22:52 ` Paolo Carlini
2003-01-27 23:10 ` Gabriel Dos Reis
2003-01-28 0:03 ` Raja R Harinath [this message]
2003-01-28 0:23 ` Gabriel Dos Reis
2003-01-27 22:56 ` Joseph S. Myers
2003-01-27 23:20 ` Gabriel Dos Reis
2003-01-28 1:47 ` Ziemowit Laski
2003-01-28 5:19 ` Gabriel Dos_Reis
2003-01-28 11:39 ` Joseph S. Myers
2003-01-28 12:43 ` Gabriel Dos Reis
2003-01-29 0:54 ` Ziemowit Laski
2003-01-29 1:32 ` Joseph S. Myers
2003-01-29 1:49 ` Ziemowit Laski
2003-01-29 2:18 ` Joseph S. Myers
2003-01-29 4:09 ` Stan Shebs
2003-01-30 2:01 ` Joe Buck
2003-01-29 6:02 ` Ziemowit Laski
2003-01-30 1:43 ` Joe Buck
2003-01-30 2:07 ` Joseph S. Myers
2003-01-30 3:40 ` Joe Buck
2003-01-30 4:20 ` Ziemowit Laski
2003-01-30 4:27 ` Joseph S. Myers
2003-01-30 6:56 ` Ziemowit Laski
2003-01-30 11:07 ` Neil Booth
2003-01-30 14:04 ` Mark Mitchell
2003-01-30 22:43 ` Neil Booth
2003-01-30 23:59 ` Ziemowit Laski
2003-01-31 13:26 ` Joseph S. Myers
2003-01-31 21:41 ` Ziemowit Laski
2003-01-28 14:04 Paolo Bonzini
2003-01-30 23:38 Paolo Bonzini
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