Re: supporting multiple versions of GCC with a single shared object release?

[mario guerra <emailformario@yahoo.com>]

--- On Tue, 4/14/09, Ian Lance Taylor <iant@google.com> wrote:

> From: Ian Lance Taylor <iant@google.com>
> Subject: Re: supporting multiple versions of GCC with a single shared object   release?
> To: "mario guerra" <emailformario@gmail.com>
> Cc: gcc-help@gcc.gnu.org
> Date: Tuesday, April 14, 2009, 5:21 PM
> mario guerra <emailformario@gmail.com>
> writes:
> 
> > I work for a chip company that produces a C++
> simulator for one of our
> > processor cores, which we deliver as a shared object
> file. We've used
> > GCC version 3.3.3 to build it, since that is the
> standard version
> > deployed within our company. However, some of our
> customers are
> > attempting to incorporate our model into third party
> simulation
> > environments which use different versions of GCC, and
> this sometimes
> > causes segmentation faults at run time from calls into
> the stdc++
> > library. We're trying to find a way to support
> customers who may be
> > using different versions of GCC without having to
> create a custom
> > simulator build for each customer.
> 
> The C++ compiler/library is supposed to have a stable ABI
> as of gcc 4.0
> and later.  For earlier versions, you pretty much do
> have to do a build
> for each version.
> 
> Ian
>

Hi Ian, 

If we built our simulator with 4.x, wouldn't that potentially break some of our third party vendors who are still using some variant of 3.x? The 4.x library isn't backwards compatible, is it?

Mario