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* NEWS: %expect-violations are now just warnings, reverting

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to Bison 1.30 and 1.75 behavior.  This fixes the GCC 3.2
bootstrapping problem reported by Matthias Klose; see
<http://mail.gnu.org/archive/html/bug-bison/2003-01/msg00053.html>.
* src/conflicts.c (conflicts_print): Likewise.
* tests/conflicts.at (%expect not enough, %expect too much,
%expect with reduce conflicts): Likewise.
* doc/bison.texinfo (Expect Decl): Document this.  Also mention
that the warning is enabled if the number of conflicts changes
(not necessarily increases).
This commit is contained in:
Paul Eggert
2003-01-13 06:41:29 +00:00
parent 8522c9ed2a
commit 69363a9e4d
4 changed files with 23 additions and 17 deletions
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5
NEWS
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@@ -3,6 +3,11 @@ Bison News
Changes in version 1.875a:
* %expect-count violations are now just warnings, not errors, for
compatibility with Bison 1.75 and earlier (when there are
reduce/reduce conflicts) and with Bison 1.30 and earlier (when there
are too many or too few shift/reduce conflicts).
* New configure option --disable-yacc, to disable installation of the
yacc command and -ly library introduced in 1.875 for POSIX conformance.

8
doc/bison.texinfo
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@@ -3558,7 +3558,7 @@ The declaration looks like this:
Here @var{n} is a decimal integer. The declaration says there should be
no warning if there are @var{n} shift/reduce conflicts and no
reduce/reduce conflicts. An error, instead of the usual warning, is
reduce/reduce conflicts. The usual warning is
given if there are either more or fewer conflicts, or if there are any
reduce/reduce conflicts.
@@ -3580,9 +3580,9 @@ Add an @code{%expect} declaration, copying the number @var{n} from the
number which Bison printed.
@end itemize
Now Bison will stop annoying you about the conflicts you have checked, but
it will warn you again if changes in the grammar result in additional
conflicts.
Now Bison will stop annoying you if you do not change the number of
conflicts, but it will warn you again if changes in the grammar result
in more or fewer conflicts.
@node Start Decl
@subsection The Start-Symbol

6
src/conflicts.c
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@@ -1,6 +1,6 @@
/* Find and resolve or report look-ahead conflicts for bison,
Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002
Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002, 2003
Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
@@ -495,12 +495,12 @@ conflicts_print (void)
if (expected_conflicts != -1)
{
if (! src_ok)
complain (ngettext ("expected %d shift/reduce conflict",
warn (ngettext ("expected %d shift/reduce conflict",
"expected %d shift/reduce conflicts",
expected_conflicts),
expected_conflicts);
if (rrc_total)
complain (_("expected 0 reduce/reduce conflicts"));
warn (_("expected 0 reduce/reduce conflicts"));
}
}

15
tests/conflicts.at
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@@ -1,5 +1,6 @@
# Exercising Bison on conflicts. -*- Autotest -*-
# Copyright (C) 2002 Free Software Foundation, Inc.
# Copyright (C) 2002, 2003 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
@@ -485,9 +486,9 @@ AT_DATA([input.y],
exp: exp OP exp | NUM;
]])
AT_CHECK([bison -o input.c input.y], 1, [],
AT_CHECK([bison -o input.c input.y], 0, [],
[input.y: conflicts: 1 shift/reduce
input.y: expected 0 shift/reduce conflicts
input.y: warning: expected 0 shift/reduce conflicts
])
AT_CLEANUP
@@ -522,9 +523,9 @@ AT_DATA([input.y],
exp: exp OP exp | NUM;
]])
AT_CHECK([bison -o input.c input.y], 1, [],
AT_CHECK([bison -o input.c input.y], 0, [],
[input.y: conflicts: 1 shift/reduce
input.y: expected 2 shift/reduce conflicts
input.y: warning: expected 2 shift/reduce conflicts
])
AT_CLEANUP
@@ -542,8 +543,8 @@ program: a 'a' | a a;
a: 'a';
]])
AT_CHECK([bison -o input.c input.y], 1, [],
AT_CHECK([bison -o input.c input.y], 0, [],
[input.y: conflicts: 1 reduce/reduce
input.y: expected 0 reduce/reduce conflicts
input.y: warning: expected 0 reduce/reduce conflicts
])
AT_CLEANUP