[cfe-dev] Should we build semantically invalid nodes?

[Argiris Kirtzidis]

Here's an alternative idea:
How about we pass a flag at Sema to indicate that Sema should just build 
the AST without semantic checks ?

The meaning of this flag is not that it guarantees that *absolutely no* 
semantic checks are done, just that the focus is less on semantics and 
more on getting a complete AST.
The Action methods could be modified gradually to check this flag, eg. 
on Sebastian's patch, if this flag is on, Sema::ActOnCXXCasts will skip 
the CheckXXXCast call and go to creating the CXXCastExpr directly.

This addresses Doug's concerns about allowing invalid nodes while also 
enabling clients that only care about a full AST.

Any thoughts ?

-Argiris