[m-rev.] diff: fix compilation failure on aral

[Julien Fischer]

On Thu, 11 Jan 2007, Zoltan Somogyi wrote:

> trace/mercury_trace_vars.c:
> 	Avoid compilation problem with gcc 3.4.6 on aral.

That looks fine (almost identical the patch I had for it).

The really odd thing about this problem is the way the linker
is behaving on our machines.  On jupiter, earth, swordfish etc,
the trace directory can be linked despite the undefined references
caused by the above problem.

Even more strange is the fact that using a compiler built from the
source distribution (in asm_fast.gc) to build a workspace on aral
in hlc.gc works fine (the references are still dangling and are
not defined in the runtime).

Julien.
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