Re: Problems using bison and flex with C++

[Hans Aberg]

At 09:07 -0300 2004/06/22, Carlos Augusto Lains Leitão wrote:
>       My name is Carlos and i am experiencing some problems using flex
>and bison with c++. I have generated the lexical scanner with flex and the
>the parser with bison. When i compile my program with gcc there is no
>problem and everything goes well but when i use g++ to compile the
>compiler points some errors such like: "undefined reference to yylex in
>the parser.tab.c generated by bison, undefined reference to yyparse in
>lex.yy.c generated by flex, undefined reference to yyerror in parser.tab.c
>generated by bison". Colud anyone give me an advice.

The Bison C parser will not work under C++ for several reasons, for
example, its stack does not invoke copy constructors when re-allocating. As
I could not get the Bison C++ parser working directly, I wrote my own. The
details are posted in the Bison-Patches group. Some fellows said that they
were able to follow the instructions to get a working C++ parser on their
own. I think this is the state of the matter, until somebody writes a
(working) C++ parser that comes with the Bison distribution.

  Hans Aberg