llvm dev - Aug 2011 - [LLVMdev] Problem I have to run a llvm module pass from main function

I need to integrate my module pass with someone else's flow. My pass should
be run inside the main() of their flow to generate the information needed for 
other functions.  My pass is declared as:
MyVec: public ModulePass
{
...
}

I used to build it into a loadable module for "opt" and it works.
Right now, in the main function, I call the MyVec pass with the new method:
main()
{
...
llvm::ModulePass* V = new MyVec();
V->runOnModule(M);

...
}

But the linking process reports:
llvm[0]: Linking Release executable vec_a (without symbols)
llvm[0]: ======= Finished Linking Release Executable vec_a (without symbols)

My Makefile is written as follows:

LEVEL=../..

TOOLNAME=vec_a

LINK_COMPONENTS := core support bitreader bitwriter asmparser instrumentation
scalaropts ipo

include $(LEVEL)/Makefile.common

Anyone have any idea of where goes wrong? Thanks.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20110817/75685602/attachment.html>