Column number information in 3.4.x?

[Per Bothner]

Chris Lattner wrote:

> I remember seeing patches floating around that add column number
> information to the GCC tree nodes, but I don't think that these are going
> into 3.4.0.  Is it likely for column number information to get added
> sometime in the lifetime of the 3.4.x series, or is this a 3.5+ only
> feature?

I'm thinking of it as a 3.5 feature.  It's a major change, at least the 
way I'm approaching it, since I'm basing it on the line-map tables, and 
expanding their use from cpplib to the entire compiler.

I guess it someone made a strong enough case it could be added in 3.4.x, 
but I think it unlikely.

Richard H has given approval for me to check an initial set of patches 
into the tree-ssa branch.  However, as I'm busy with other things rights 
now, I'm thinking I might wait until the 3.4 branch is created and check 
it into mainline instead.  But I can check it into the tree-saa branch 
sooner if requested or I go back to working on it before the 3.4 branch.

The current patch only adds column number support to the source_location 
cookies.  I have other older patches to replace struct location_t by 
source_location; this would add column number support to the rest of the 
compiler.  These patches would need to be updated.  In addition, 
front-ends that don't use cpplib would need to be updated to use 
line-map and source_location.  This should be relatively easy with the 
more encapsulated line_map API that Richard pushed me to but I haven't 
really looked at it.
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/