On Thu, 10 Mar 2005, Volker Wegert wrote:
> I'm currently trying to gain some experience with flex and bison.
I've found that I prefer using Flex and Bison separately rather than
together. If you're just starting out learning Bison, I think you
might find it easier to write your own `yylex()' function rather than
using Flex.
> In one of my
> projects, I'd like to use these two tools together with some Qt classes. I'm
> not trying to create an object-oriented parser, I'm just using Qt's string and
> list objects as I'm much more familiar with them.
Perhaps it would simplify matters if you just used the `string' and `list'
template classes from the C++ Standard Template Library. You don't need
to generate a C++ parser function. I just generate an ordinary C parser
function, use C++ in the actions, and compile with `g++'.
> However, I get the following error message during linking (output
> abbreviated):
> | undefined reference to `yyparse()'
>
> So as far as I can see, the function yylex() should be present. Can anybody
> tell me what's going wrong here?
I didn't see an error message about an undefined reference to `yylex()'.
Since you have an undefined reference to `yyparse()', I would check two
things first:
1. Is `yyparse()' declared in a header file included by all compilation
units containing a call to it?
2. Is the object file containing the definition of `yyparse()' included
in the call to the linker?
Laurence Finston
http://www.gnu.org/software/3dldf/LDF.html
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