[Bug c/53072] automatically set Init() only if option was not set in some other way

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53072

--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2012-04-24 14:10:48 UTC ---
(In reply to comment #1)
> On Sun, 22 Apr 2012, manu at gcc dot gnu.org wrote:
> This is explicitly not a detailed design; anyone implementing it would 
> need to flesh out the details.

Say we have: A enables B enables C. Do we actually need to track that C was
enabled by B or by A? Sorry I cannot imagine what for. 

For warning options, it is sufficient to track the C was enabled by other
option different from C. It seems we have most of the infrastructure to do
this, however, it is unclear how to use this infrastructure to make Init()
useful again, or implement  PR 53063.