[LLVMdev] Linking strncpy

[Eric Zimmerman]

Hi,

I'm working on a CS326 compiler project, and I'm having some problems
using string functions.  Some LLVM programs produced are either
aborting or giving incorrect results; however, if I disassemble the
LLVM bytecode and recompile with GCC, everything works fine.

I encountered the following error when running lli with
'-force-interpreter' option: 

"Tried to execute an unknown external function: sbyte * (sbyte
*, sbyte *, uint) * strncpy"

Strncpy is used as part of my compiler's run-time library, and it was
compiled with the C-frontend for LLVM.  Looking at the assembly, the
function is declared at the top of the file;

declare sbyte* %strncpy(sbyte*,sbyte*,uint) ;; __builtin_strncpy

And it is called like this:
	%tmp.12 = call sbyte* (sbyte*, sbyte*, uint)* %strncpy(sbyte*
%tmp.15, sbyte* %tmp.23, uint %tmp.27)

What am I forgetting to do?  What is the right way to link to the
string functions?  Thanks,

-Eric Zimmerman