[Bug tree-optimization/62071] [4.10 Regression] ICE: in before_dom_children, at tree-ssa-pre.c:4411

[jason at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62071

--- Comment #5 from Jason Merrill <jason at redhat dot com> ---
On 08/14/2014 02:10 PM, Jan Hubicka wrote:
> I wonder what we should do with both external and comdat here.  Jason, can we devirtualize?

No, we're setting comdat now to avoid devirtualization, because we can't 
be confident that we'll be able to refer to the definition where it gets 
emitted.

> The constructor is keyed to other compilation unit here, but we are provided with a body
> that we will never use (modulo the tree-ssa-pre bug that brings the reference into code).

Hmm, we might consider overriding DECL_EXTERNAL so that there's a 
definition available for devirtualization.

Jason