Re: [Flex-help] YY_DO_BEFORE_ACTION

[Virgil P. <vir...@gm...>]

  Thanks guys,  I eventually figured it out myself, by looking at the
preprocessed file produced by cl.exe; my error was that
I indirectly included the generated header file (zend_language_scanner.h),
and this file was #undef-ing the YY_DO_BEFORE_ACTION macro ; maybe you can
add a "check" in the generated scanner, to prevent this file from being
included (e.g, start the generated .c file with "#define <prefix>HEADER_H",
so that if the header is included, it will have no effect) - this may save
others some trouble :)

    Regards,
        Virgil.


On Wed, Feb 4, 2009 at 9:40 AM, Virgil Palanciuc <vir...@gm...
> wrote:

>    Hello all,
>
> I'm using flex 2.5.35 on cygwin, and I compile with VS2008. I tried to do a
> reentrant scanner using flex, and I'm getting "undeclared identifier" errors
> for YY_NEW_FILE and YY_DO_BEFORE_ACTION; it should be worth to note that in
> my  lex specification, I do not use explicitly these macros... though I do
> use yyless (which in turn is defined to use YY_DO_BEFORE_ACTION). It's
> strange, because:
>
> 1. AFAICT, YY_DO_BEFORE_ACTION is defined as a macro in the generated file
> (before being used), so this may be in fact a VS2008 issue
> 2. YY_NEW_FILE's definition is commented-out (not by me!), so this seems to
> be a flex issue.
>
>
>    Anybody can help with these issues? Have you encountered something
> similar? I've seen a message with a problem with YY_NEW_FILE in flex 2.5.31,
> and the advice was to "use an older version, because this is a know lex bug"
> - hasn't it been fixed meanwhile? And if no, can you advise on what version
> should be used?
>
>     Thanks in advance,
>          Virgil
> P.S. I'm using the following lex options:
> %option reentrant stack bison-bridge noyywrap yylineno
> and the command line is
> >flex -Pzend -ozend_language_scanner.c
> --header-file=zend_language_scanner.h zend_language_scanner.l
>
> YYNEW_FILE is used here:
>
> case EOB_ACT_END_OF_FILE:
>  {
> if ( zendwrap(yyscanner ) )
> return EOF;
>
> if ( ! yyg->yy_did_buffer_switch_on_eof )
> YY_NEW_FILE;
>
>
> and it's "definition" is
>
> /* Special action meaning "start processing a new file". */
> //#define YY_NEW_FILE zendrestart(yyin ,yyscanner )
>
>
> for YY_DO_BEFORE_ACTION, I would have to list the entire file....
>