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Complain about unused %define variables and %code qualifiers.

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* NEWS (2.5): Document.
* data/bison.m4 (b4_check_user_names): Complain instead of warn.
* doc/bison.texinfo (Decl Summary): Document complaint, and
improve %define documentation a little otherwise.
* tests/input.at (Reject unused %code qualifiers): Update.
(%define errors): Update.
(%define, --define, --force-define): Update.
(%define backward compatibility): Update.
(Unused %define api.pure): Update.
* tests/push.at (Push Parsing: Unsupported Skeletons): Update.
This commit is contained in:
Joel E. Denny
2009-09-03 16:04:10 -04:00
parent 9789acf091
commit c6abeab182
6 changed files with 82 additions and 60 deletions
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doc/bison.texinfo
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@@ -4763,7 +4763,9 @@ use this form instead.
@var{qualifier} identifies the purpose of @var{code} and thus the location(s)
where Bison should generate it.
Not all values of @var{qualifier} are available for all target languages:
Not all @var{qualifier}s are accepted for all target languages.
Unaccepted @var{qualifier}s produce an error.
Some of the accepted @var{qualifier}s are:
@itemize @bullet
@item requires
@@ -4845,9 +4847,6 @@ parse.trace}.
@deffnx {Directive} %define @var{variable} @var{value}
@deffnx {Directive} %define @var{variable} "@var{value}"
Define a variable to adjust Bison's behavior.
The possible choices for @var{variable}, as well as their meanings, depend on
the selected target language and/or the parser skeleton (@pxref{Decl
Summary,,%language}, @pxref{Decl Summary,,%skeleton}).
It is an error if a @var{variable} is defined by @code{%define} multiple
times, but see @ref{Bison Options,,-D @var{name}[=@var{value}]}.
@@ -4859,7 +4858,7 @@ digit.
Omitting @code{"@var{value}"} entirely is always equivalent to specifying
@code{""}.
Some @var{variable}s may be used as Booleans.
Some @var{variable}s take Boolean values.
In this case, Bison will complain if the variable definition does not meet one
of the following four conditions:
@@ -4872,10 +4871,14 @@ This is equivalent to @code{true}.
@item @code{@var{value}} is @code{false}.
@item @var{variable} is never defined.
In this case, Bison selects a default value, which may depend on the selected
target language and/or parser skeleton.
In this case, Bison selects a default value.
@end enumerate
What @var{variable}s are accepted, as well as their meanings and default
values, depend on the selected target language and/or the parser
skeleton (@pxref{Decl Summary,,%language}, @pxref{Decl
Summary,,%skeleton}).
Unaccepted @var{variable}s produce an error.
Some of the accepted @var{variable}s are:
@table @code