Re: [PATCH 2/2] dtc: cpp co-existence: add support for #line directives

[David Gibson <david-xT8FGy+AXnRB3Ne2BGzF6laj5H9X9Tb+@public.gmane.org>]

On Mon, Sep 24, 2012 at 04:51:17PM -0600, Stephen Warren wrote:
> From: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> 
> Line control directives of the following formats are supported:
>     #line LINE "FILE"
>     # LINE FILE [FLAGS]
> 
> This allows dtc to consume the output of pre-processors, and to provide
> error messages that refer to the original filename, including taking
> into account any #include directives that the pre-processor may have
> performed.

I like the idea of handling line directives, whichever way we go with
the other cpp-related proposals.  The fact that these are
distinguished from a propnodename beginning with # only by the
following digits is more subtle than I'd ideally like, but I think
it's wirth it.

The only thing I would like to see change is to only recognize line
directives at the beginning of the line (in fact, preferably in column
0 only).  Unfortunately that is going to mean some mucky flex work,
including a new start state, I expect.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson