[m-rev.] for review: move dl.m closure creation into runtime

[Simon Taylor]

On 22-Sep-2003, Fergus Henderson <fjh at cs.mu.OZ.AU> wrote:
> On 20-Sep-2003, Simon Taylor <stayl at cs.mu.OZ.AU> wrote:
> > 
> > browser/dl.m:
> > runtime/mercury_ho_call.{c,h}:
> > 	Move the code in dl.m to create closures into the runtime.
> > 	The code is actually clarified by implementing it entirely
> > 	in C, rather than a mish-mash of C and Mercury.
> > 
> > 	The rationale for this change is that Aditi needs to be able
> > 	to create closures for dynamically linked procedures.  Just
> > 	copying browser/dl.m as it was into the Aditi sources would
> > 	create an undesirable dependency on Mercury runtime
> > 	implementation details.
> 
> Shouldn't Aditi use extras/dynamic_linking/dl.m?

Possibly, altough it's simpler to use MR_create_closure() than
requiring Aditi users to install an extra library.

Even not considering Aditi, I think this change is an improvement
on the status quo, so I'll commit it.

Simon.
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