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

[David Gibson]

On Tue, Sep 25, 2012 at 11:58:00PM -0600, Stephen Warren wrote:
> On 09/25/2012 10:34 PM, David Gibson wrote:
> > On Mon, Sep 24, 2012 at 04:51:17PM -0600, Stephen Warren wrote:
> >> From: Stephen Warren <swarren at nvidia.com>
> >>
> >> 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.
> 
> That turns out to be exceedingly easy; just put ^ at the start of the
> regex (after the start state specification), and Flex takes care of
> everything:-)

Oh yeah, I forgot about ^ :).  I like it when things turn out easier
than expected :).

-- 
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