Re: bison-2.1 compilation warnings

[Akim Demaille]

Le 10 mai 06 à 22:00, Bruno Haible a écrit :

hi Bruno,

> ============================
> /* Begin user sect3 */
>
> #define yywrap(n) 1
> #define YY_SKIP_YYWRAP
> ============================

That's weird, yywrap is not expected to take arguments.  There is a
problem in the Bison distro, agreed, but the problem is with lex
generated code, improperly used by itself.  None of the code you
quote is shipped or generated by bison.

What lex is that?  Hm, it looks like flex code, I have similar comments
in my output, but

sulaco% lex --version
lex version 2.5.4
sulaco% grep yywrap _build/examples/calc++/calc++-scanner.cc
/* Flag which is used to allow yywrap()'s to do buffer switches
#define yywrap() 1
# undef yywrap
# define yywrap() 1
extern "C" int yywrap YY_PROTO(( void ));
extern int yywrap YY_PROTO(( void ));
                                if ( yywrap() )
                                        if ( yywrap() )
         * EOF (yywrap()) processing, but the only time this flag
         * is looked at is after yywrap() is called, so it's safe


and on another machine, I have:

~/src/bison % flex --version                                      
nostromo 22:34
flex 2.5.33
~/src/bison % grep yywrap _build/examples/calc++/calc++-scanner.cc
/* Flag which is used to allow yywrap()'s to do buffer switches
#define yywrap() 1
# undef yywrap
# define yywrap() 1
extern "C" int yywrap (void );
extern int yywrap (void );
                                if ( yywrap( ) )
                                        if ( yywrap( ) )
         * EOF (yywrap()) processing, but the only time this flag
         * is looked at is after yywrap() is called, so it's safe
~/src/bison % grep -A3 sect3 _build/examples/calc++/calc++-scanner.cc
/* Begin user sect3 */

#define yywrap() 1
#define YY_SKIP_YYWRAP



You seem to be using a broken version of Flex.