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Re: yyparse being prototyped in y.tab.h causes problems.

From: Akim Demaille
Subject: Re: yyparse being prototyped in y.tab.h causes problems.
Date: Tue, 18 Aug 2015 21:40:20 +0200

> Le 18 août 2015 à 16:40, Kaz Kylheku <address@hidden> a écrit :
> On 18.08.2015 06:35, I blundered:
>> Hi Akim,
>> The example I gave is (to my best knowledge and effort)
>> POSIX-conforming Yacc code.
> Hi Akim, and everyone,
> Sorry for the above nonsense; of course it obviously is
> not due to the
>  %pure-parser
>  %parse-param{private_context *ctx}
> which is important to the issue!
> If you use an extension, then the yacc implementation
> can put whatever it wants in y.tab.h, of course;
> conformance has largely gone out the window.
> Though not standard, %pure-parser and %parse-param are implemented by other 
> parser generators, though, like Berkeley Yacc. (Because reentrant parsing is 
> a very
> important extension!)
> On the other hand, %code doesn't port to byacc:
>  byacc: e - line 10 of "test.y", syntax error
>  %code { abc }
>  ^

Well, in that case I would include the forward declaration of your struct in 
file that include your *.tab.h.

Or, given that the declaration of yyparse is issued quite late in the *.tab.h 
file, couldn't you portably use %{...%} to forward declare your 
private_context?  The same mechanism as the one used to declare the symbols 
needed by yystype.

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