enhance .loc directive for dwarf3 special features

[David Daney]

Richard Henderson wrote:
> On Wed, Sep 07, 2005 at 09:28:56AM -0400, Daniel Jacobowitz wrote:
> 
>>Hmm, I would have expected:
>>
>>	.loc [FILE LINE [COLUMN]] [basic_block] [is_stmt [VALUE]]
>>
>>et cetera.  I think it's still unambiguous.  The chattier we make these
>>things, the longer it'll take to assemble them... but probably not a
>>big deal.
> 
> 
> I suppose that's possible as well, yes.  I hadn't liked that because
> it makes the column number non-optional, but having the user add the
> one zero is not that big a deal.
> 

I must be missing something.

Why would the column number be non-optional?

David Daney