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

[Stefan R. <sr...@ma...>]

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. The solution so far is to
compile the GC with "-DREDIRECT_MALLOC=GC_malloc_uncollectable"
(overloading ::operator new didn't seem to do the trick).
Just in case someone else also stumbles across that problem...

> 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.


  Stefan