[Opencxx-users] Re: [opencxx] Porting to MacOs X

[Grzegorz J. <ja...@he...>]

On 2003-02-14 Stefan Reuther wrote:

> Hello,
>
> On Fri, Feb 14, 2003 at 09:44:39AM +0800, Grzegorz Jakacki wrote:
> > On Thu, 13 Feb 2003, Alexandre Tolmos wrote:
> > > I would like to use OpenC++ on MacOs X. Compiling occ itself shouldn't
> > > be a big issue (Darwin, the core Os is FreeBSD based) but the garbage
> > > collector is Os and architecture dependent. So, my questions are:
> > >
> > > - Is there a Mosx port of GC?
> >
> > It seems to me that recent versions of Hans Boehm's GC supports MacOS X.
> [...]
> > Try to build with one of them and let me know if it works. MacOS X port
> > of OpenC++ would be very welcome.
>
> JFTR: I have built OpenC++ with a different GC than the included
> one. Here's what I did:
> + clear the "gc" subdirectory from the OpenC++ source tree
> + install the garbage collector into that directory
> + symlink all files from "gc/include" into "gc". OpenC++ wants
>   to say "#include <gc/gc.h>".
>
> The versions I tried were GC 6.1 and OpenC++ 2.5.12; I still
> have to try the CVS version.
>
> The reason why I replaced the GC was because my program crashed
> and I suspected a GC bug. Later, it turned out that the GC doesn't
> trace STL containers for pointers.

It does, but you have to use custom allocator. There are headers for that
somewhere in GC distribution. I was using it in 'exp_templates' branch.

Or if you do not want to bother GC with container memory, just write
wrapper for plain pointers and use the wrapper when storing elements in a
container.

[...]
> > PS: If this does not work, however, there is possibly a way to get rid of
> > GC at all with help of boost::shared_ptr<>.
>
> Uhm. I doubt that. At least, this fundamental piece of Ptree
>     union {
>         struct {
>             Ptree* child;
>             Ptree* next;
>         } nonleaf;
>         struct {
>             char* position;
>             int  length;
>         } leaf;
>     }data;
> will not compile when replacing Ptree* by boost::shared_ptr<Ptree>.
> So you'd have to rewrite quite a lot, I think.

Unfortunately you are absolutely right.

Best regards
Grzegorz

FYI: The original posting of your e-mail somehow did not make it to my
     mailbox.

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