Re: ./libstdc++-v3/include/bits/stl_alloc.h : Incompatibility betweeng++ 3.3 and g++ 3.2?

[Martin Beaudoin <beaudoin dot martin at ireq dot ca>]

Benjamin Kosnik wrote:

> > Now, as for my incompatibilitiy problem (stl_alloc.h is not downward 
> > compatible from g++ 3.3 to g++ 3.2), the only solution I can see is that 
> > I need to standardize my development Linux stations over one and only 
> > one g++ compiler version. 
> >    
>
> You are confused. There is only upward compatibility, ie 3.2 links with
> -> 3.3, not the other way around. Thus, if you are compiling with 3.3,
> you'll need to link to 3.3. If you compile with 3.2.x, you'll be able to
> link with 3.2.x or 3.3.x.
>
> I believe Andreas answered this question also, indicating that it should
> go in our docs. I'll work on updating them over the weekend.
>
> -benjamin
>  
I am not confused.

The common understanding about GNU version numbering scheme is that 
compatibility should be preserved between minor version releases and 
that  incompatibilities are usually introduced and/or expected between 
major versions release (gcc 2.x and gcc 3.x).

I will also refer you to the "The Linux GCC HOWTO", section "Building 
your own libraries", subsection "Version control".  

Excerpt from this subsection:

"So, we introduce library versioning. We categorise the changes that 
might be made to a library as `minor' or `major', and we rule that a 
`minor' change is not allowed to break old programs that are using the 
library."

Why cant the libstdc++ dev. team follow this simple and well known rule too?

If this is not the case for the GCC and/or libstdc++ development team, 
then both the GCC and libstdc++ version numbering scheme should be 
explained and written in bold characters somewhere  in the FAQ or docs 
so that the "confusion" could be shared and known by everybody.

Martin



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Martin Beaudoin, M.Sc.A., ing.             beaudoin.martin@ireq.ca
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