Hi,
> Le 7 févr. 2019 à 17:43, Peng Yu <[email protected]> a écrit :
>
> Hi,
>
> I see both yytokentype and the corresponding macro definitions in
> y.tab.h. It sounds like just one of them will be sufficient. Why are
> there both of them?
>
> /* Token type. */
> #ifndef YYTOKENTYPE
> # define YYTOKENTYPE
> enum yytokentype
> {
> IF = 258,
>
> /* Tokens. */
> #define IF 258
You don't specify the version of Bison you ran. Let's assume it was an ancient
version, say 2.3 for instance. In which case I read this:
/* Tokens. */
#ifndef YYTOKENTYPE
# define YYTOKENTYPE
/* Put the tokens into the symbol table, so that GDB and other debuggers
know about them. */
enum yytokentype {
IF = 258
};
#endif
/* Tokens. */
#define IF 258
which has some quite explicit comments.
If you take a recent version of Bison, you'll get this:
/* Token type. */
#ifndef YYTOKENTYPE
# define YYTOKENTYPE
enum yytokentype
{
IF = 258
};
#endif
and nothing else.
Cheers.
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