Usage of LLVM DependenceAnalysis Pass

Question

For my own LLVM pass I need the results of the llvm::DependenceAnalysis() pass. I.e. I want the DependenceInfo object for some module/function.

I tried several approaches to get the pass to run the pass, however none worked so far.
Any hints on how to use DependenceAnalysis are welcome!

First approach:

I tried calling the DependenceAnalysis().run() function directly inside the run() function of my own pass.

// MAM is the ModuleAnalysisManager that is an argument to the run() function of my pass
FunctionAnalysisManager &FAM = MAM.getResult<FunctionAnalysisManagerModuleProxy>(M).getManager();
DependenceAnalysis depAnalysis;
llvm::DependenceInfo depInfo = depAnalysis.run(F, FAM); 

When I run my pass I get an error from opt: opt: CommandLine Error: Option 'enable-fs-discriminator' registered more than once!

I am not able to find the origin of this error message.

Second approach: I added the DependenceAnalysis() pass directly to the ModulePassManager, to which I also add my own pass.

MPM.addPass(createModuleToFunctionPassAdaptor((DependenceAnalysis())))

This results in a compile erorr, since DependenceAnalysis.run() does not return a PreservedAnalysis object but a DependenceInfo object.

Answer 1

I found that the problem was not only how I used the DependenceAnalysis but also some problems due to my linking of LLVM.

Getting the results of DependenceAnalysis is done by:

FunctionAnalysisManager &FAM = MAM.getResult<FunctionAnalysisManagerModuleProxy>(M).getManager();
DependencyInfo depInfo = FAM.getResult<DependenceAnalysis>(F);

Thanks to @arnt for pointing to the linking problem. Turns out I linked LLVM twice in CMake.