Re: flex+bison and C++, second part

[Tamas Nagy]

Hi!

With no parser.c. Main() is in the .y file, the
following error occured:

alfa.tab.cpp: In function `int yyparse()':
alfa.tab.cpp:1097: error: `yylex' undeclared (first
use this function)
alfa.tab.cpp:1097: error: (Each undeclared identifier
is reported only once
   for each function it appears in.)
alfa.tab.cpp:1315: error: `yyerror' undeclared (first
use this function)
alfa.ypp: In function `int yyerror(char*)':
alfa.ypp:323: error: `int yyerror(char*)' used prior
to declaration
alfa.ypp:328: error: `vrml_filel_linenum' undeclared
(first use this function

--------------------------
%%

int yyerror(char * s)
{
    extern char yytext[];
    int linenum;
    char * ff;

    linenum = vrml_filel_linenum(&ff);
    fprintf(stderr, "%s:%d: Error:\n%s  before
'%s'\n\n\n",
            ff, linenum, (char *)s, *yytext=='\n'?
"\\n": yytext);

    return 0;
}


int main()
{

    return 0;
}

-----------------------

What should i modify to get it work?

> Hi!
> 
> I also have a parser.c file. (sourcehandler)
> Should i have to rewrite it to c++ or just link it?
> 
> Because of this, which is in the .y file:
>   vrml_filel_init(f, argv[1]);
> 
> it cannot compile to c++. Even if #include
> "prog.tab.h"
> it cannot see the above function.
> 
> I have the bottom files too:
> > Got link problem (i suppose)
> > so the general way to compile a lex & yacc program
> > is:
> > 1. Generate the lexer
> >      lex my_file.l
> > 2. Generate the parser
> >     yacc -d my_file.y
> > 3. Compile the sources
> >     cc -c lex.yy.c y.tab.cc
> > 4. Link the object files (this is what i think
> your
> > problem is)
> >     cc -o my_application lex.yy.o y.tab.ob -ll -ly
> > If you're using flex change the link library like
> > this:
> >     cc -o my_application lex.yy.o y.tab.ob -lfl
> -ly
> > 5. Eat cake
> > 
> > it depends on which platform you are developing.
> > If you're developing on windows use a batch file.
> > -- 
> > View this message in context:
> >
>
http://www.nabble.com/flex%2Bbison-and-C%2B%2B%2C-second-part-tf1959860.html#a9905584
> > Sent from the Gnu - Bison - Help mailing list
> > archive at Nabble.com.
> > 
> > 
> > 
> > _______________________________________________
> > address@hidden
> > http://lists.gnu.org/mailman/listinfo/help-bison
> > 
> 
> 
> 
>        
>
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