[LLVMdev] Error while compilation of llvm-as

[Seung Jae Lee]

Hello, LLVM guys.
While compliling llvm-as(LLVM ver. 1.9), I got an error looks like this: 
(I haven't modified any part in llvm-as and I just compiled it but....)
-------------------------------------------------------------------
Debug Error!

Program: ...\llvm-as.exe
Module: ...\llvm-as.exe
File: c:\usr\share\bison.simple
Line:561

Run-Time Check Failure #3 - The variable 'yyval' is being used without being defined.
-------------------------------------------------------------------
This 'yyval' is used in yyparse() in llvmAsmParser.y:868.

Oh.. I forgot to say I used Visual Studio for this compile.
Can you help me, if you have any idea w.r.t this?

Thanks,
Seung Jae Lee