[LLVMdev] linkage types on global alias

[Nick Lewycky]

I'm getting an error in the verifier after running a custom pass:

   Alias should have external or external weak linkage!

This constraint isn't mentioned in the LangRef. According to the 
verifier code, the only permitted linkage types for a GlobalAlias are 
external, internal and weak.

Why is that? The LangRef describes weak in terms of common, and common 
in terms of linkonce. Is there some semantic reason that an alias with 
common or linkonce wouldn't make sense, or is it just a case that this 
part of the verifier was never updated when new linkage types were added?

Nick