Re: Selective Compilation

[Tejas Kajarekar]

Hi Martin,
If I understand your question correctly, here is a way to have multiple
scanners and parsers in the same program.

In Flex, you can use the --prefix = NEW_PREFIX. This will change the default
"yy" prefix to NEW_PREFIX, So yylex, yytext, yyout, etc., *including
yywrap()*, will change to NEW_PREFIXlex, NEW_PREFIXtext, etc. It will also
change the default output file name from lex.yy.c to lex.NEW_PREFIX.c.
Multiple flex programs can be linked together into same program.

In Bison, -p NEW_PREFIX (or --name-NEW_PREFIX) option can be used for the
same purpose. This will rename most of the yyvariables and yyfunctions to
NEW_PREFIX variables and NEW_PREFIXfunctions. yyparse will also be renamed
to NEW_PREFIXparse.

tejasSK

On Sun, Feb 6, 2011 at 8:39 AM, Martin Alexander Neumann <
address@hidden> wrote:

> Hi,
>
> some time ago I designed a flex + bison system for an embedded system
> for which I needed selective compilation -- different systems needed
> different language subsets of my flex and bison files. I threw together
> a solution using the C preprocessor to selective compile in only the
> relevant stuff. It is working pretty well but how about a solution
> natively integrated into flex and bison?
>
> Cheers, Martin
>
>
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