[LLVMdev] Add call printf instructions problems

[Tim Northover]

> But I got another problems. I successfully compile the pass and I can insert
> the call printf (C Lib function) instructions in the LLVM IR(eg: call.bc).
> If the call.bc didn't contain call printf instruction ,I can call printf
> successfully ,but if not ,there exists a problem. the llvm will rename my
> inserted call function , and the transformed code can not run correctly!

That looks like the issue Hongxu mentioned: you're always creating a
new Function (at which point LLVM renames it if one already exists)
when you should really be calling GetOrInsertFunction to lookup an
existing "printf" if it's available.

Cheers.

Tim.