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2007-01-30 Paolo Bonzini <bonzini@gnu.org>

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* data/bison.m4 (b4_percent_define_flag_if): Don't treat 0 as false.
	Complain if the value does not match empty, "true" or "false".
	* data/c++.m4: Adjust default definitions of %define variables.
	* data/java.m4: Adjust default definitions of %define variables.
	* doc/bison.texinfo (Decl Summary): Adjust the %define entry according
	to above behavior.
	* tests/input.at (Boolean %define variables): Test new behavior.
This commit is contained in:
Paolo Bonzini
2007-01-30 08:01:29 +00:00
parent 8405b70c05
commit c1d19e10c3
6 changed files with 49 additions and 16 deletions
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19
doc/bison.texinfo
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@@ -4691,15 +4691,16 @@ already defined, so that the debugging facilities are compiled.
@end deffn
@xref{Tracing, ,Tracing Your Parser}.
@deffn {Directive} %define @var{define-variable}
@deffnx {Directive} %define @var{define-variable} @var{value}
Define a variable to adjust Bison's behavior.
The list of available variables and their meanings depends on the selected
target language and/or the parser skeleton (@pxref{Decl Summary,,%language}).
The @var{value} can be omitted for boolean variables; for
boolean variables, the skeletons will treat a @var{value} of @samp{0}
or @samp{false} as the boolean variable being false, and anything else
as true.
@deffn {Directive} %define @var{variable}
@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, depends on the selected target
language and/or the parser skeleton (@pxref{Decl Summary,,%language}).
Some @var{variable}s may be used as boolean values: in this case, the
skeleton will conventionally treat a @var{value} of @samp{false} as the
boolean variable being false; a @var{value} of @samp{true}, or @var{value}
being omitted altogether, will conversely define the variable as true.
@end deffn
@deffn {Directive} %defines