Re: prologue not in y.tab.h with bison 2.4.1

[Joel E. Denny]

On Fri, 6 Nov 2009, address@hidden wrote:

> On Fri, Nov 06, 2009 at 10:38:19AM -0500, Joel E. Denny wrote:
> > What Bison release were you using previously?  What skeletons are you 
> > using?  If the answer is 2.3 or earlier with C++ or GLR skeletons, then 
> > see the 2.3a entry in NEWS.  This change is permanent and intentional.  
> > In hindsight, it has caused backward compatibility problems for too many 
> > users, but many users have now adjusted, so it's too late to revert.  I 
> > apologize for the trouble.
> 
> I was using 2.3 (with glr), I'll have a look at the NEWS, thanks for
> pointing it out. And I'll adjust my setup then to work both with 2.3 and
> 2.4 :-)

It sounds like you already know this, but I should point out for the 
record that %code was not available in 2.3.  Thus, projects that need 
compatibility with 2.3 and later will have to manually copy the 
pre-prologue into files that include the generated parser header file.  
Of course, to avoid duplicate code, the pre-prologue can be moved to its 
own header file.