Re: flex++ & bison++

"Alain Coetmeur" <>
27 Jul 1998 11:45:41 -0400

          From comp.compilers

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From: "Alain Coetmeur" <>
Newsgroups: comp.compilers
Date: 27 Jul 1998 11:45:41 -0400
Organization: Compilers Central
References: 98-07-141
Keywords: lex, yacc, C++

Nicholas Kirsch a ecrit:
>I am using flex ++ & bison ++ made by Alain Coetmeur (
>and running into problems. I have a legimate grammar that compiled and
>execute just fine under flex and bison, called dialog.l & dialog.y.

#include <disclaimer.h>
cout<<"note that my boss tell me to tell that bison++/flex++ are no
more supported..."<<endl;

moreover ther are products that are much more up todate, especially
flex2.5&+... look also about Andrew Bison-A1&+
who knows better one ?


>I run these commands.
>flex++ dialog.l (generates lex.yy.c)
>bison++ -d dialog.y (generates &
>I then compile with g++ like so :
>g++ lex.yy.c
>The result is that I get an undefined reference to `parse virtual table`

If I remember this is something about the function printing errors...
look in the header (or in the preprocessed version since my headers
are very very intricated... please apology 8( )

>I have read the man pages for both, and found no useful information. I
>know that with flex I previously had to compile with -lfl to link in the
>flex libraries, but this doesn't work with these tools.

with the C++ mapping, you have to code it yourself...
this takes 10 lines... look into the sammples in "misc"

best regards

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