[RFC] Don't lose compilation directory in Dwarf2 line-tables

[Frederic RISS]

On Thu, 2006-04-20 at 18:09 -0700, Jim Blandy wrote:
> So, Frederic, your last patch doesn't introduce any new problems that
> I can see, and it does solve the problem you set out to solve
> originally (losing comp_dir), but if you're willing go around one more
> time, we can try to add the info consistently:

OK, here we go.

> - Leave the comparison loop alone, as in your last patch.
> - If dwarf2_start_subfile does have to start a subfile itself, always
> pass comp_dir as start_subfile's second argument, whether it's NULL or
> not (because this is what we do when calling start_symtab), and
> concatenate dirname, if it's non-null, with filename to get
> start_subfile's first argument.  I think this means that 'fullname'
> always gets used, so you can hoist that computation and its xfree out
> of the 'if'.

But then, the loop in dwarf2_start_subfile doesn't serve any purpose,
because the loop at the beginning of start_subfile proper will do the
same work. Or maybe I'm missing something?

> Either way, this definitely needs a comment.  If you'd like to write
> up one yourself, great; if not, that's fine; I'll put one in after
> your patch goes in.

Attached is a new patch that adds comments and removes the superfluous
loop. How's that?

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