[boost] Re: Auto_link and BOOST_DYN_LINK

From: Edward Diener (eddielee_at_[hidden])
Date: 2004-04-07 12:40:10

"David Abrahams" <dave_at_[hidden]> wrote in message
news:u1xmzbuta.fsf_at_boost-consulting.com...
> "Edward Diener" <eddielee_at_[hidden]> writes:
>
> > I know it is late to suggest a change but I think that the default when
one
> > links to the dynamic RTL should be that a dynamic link library is
created,
> > not a static library.
> >
> > My own experience is that creating a dynamic link library is the norm
when
> > linking to the dynamic RTL, creating a static library is the norm when
> > linking to the static lib version of the RTL, and that following any
other
> > mixed setup seems to lead to problems at run-time, particularly when
memory
> > management is involved.
> >
> > Now I know that auto-link specifies it is an #error if one tries to
> > create a dynamic link library, using BOOST_DYN_LINK, when one is
> > using the static version of the RTL. I am wondering why this is any
> > less of a problem than if one attempts to create a static library
> > using the DLL version of the RTL.  Despite the fact that I don't
> > like either mixture, I would welcome an explanation of why one is
> > allowable, and safe, and the other is not.
>
> The RTL is responsible for OS resource allocation, and when two copies
> are used together, as occurs when two DLLs are each using a static
> RTL, resources must be deallocated in the same RTL where they were
> allocated.  There's no analagous problem when using a dynamic RTL with
> static libraries.  Although static user libraries may
> allocate/deallocate resources of their own, linking two copies of the
> same static user library together always fails.

Appreciated, and makes sense. Thanks !