prologue not in y.tab.h with bison 2.4.1

[sandori]

Dear All!

I have a small project, with the following setup:

parser.y:
%{
        #define THIS    foo
        #define THAT    bar
%}

%%
/* ... snip ... */

lexer.c:
#include "y.tab.h"

int yylex(void) {
        THIS;
        THAT;
}

In short, the lexer uses definitions from the prologue of the parser
file (lexical tie-ins and some macros). This used to work, as bison used
to include the prologue section in the y.tab.h file. I noticed, that
with bison 2.4.1 this is no longer the case and this broke my setup. I
know that it can be fixed in several ways, but I thought I would first
ask if this is intentional and will remain so in the future versions of
bison.

I've looked at the changelogs but didn't find any warnings about this
case, so is this the intended behavior?

regards
Istvan Sandor