How to register a new LLVM backend?

I'm developing a very basic new LLVM backend for a RISC machine (named Risco), based on the existing Sparc backend and this tutorial. To register the backend, I've used the following.

At RiscoTargetMachine.cpp:

extern "C" void LLVMInitializeRiscoTarget()
{
    // Register the target.
    RegisterTargetMachine<RiscoSimulatorTargetMachine> X(TheRiscoTarget);
    RegisterAsmInfo<RiscoMCAsmInfo> Y(TheRiscoTarget);
}

At Risco.td:

def : Processor<"simulator", NoItineraries, [FeatureA]>;


def Risco : Target {
        // Pull in Instruction Info:
        let InstructionSet = RiscoInstrInfo;
}

At TargetInfo/RiscoTargetInfo.cpp:

Target llvm::TheRiscoTarget;


extern "C" void LLVMInitializeRiscoTargetInfo() {
        RegisterTarget<> X(TheRiscoTarget, "risco", "Risco");
}

At the top level LLVM configure script:

# Added Risco to the TARGETS_TO_BUILD variable at line 4965 (from svn trunk):
all) TARGETS_TO_BUILD="X86 Sparc PowerPC Alpha ARM Mips CellSPU PIC16 XCore MSP430 SystemZ Blackfin CBackend CppBackend MBlaze PTX Risco" ;;

After build, llc -version doesn't show the new target. Even llc -march=risco test.ll says it's an invalid target. What am I missing?

PS: Currently, I'm including the new target as a folder inside llvm/lib/Target. How can I change that so I can build the target separately, and load it dynamic with llc -load?

ansaurus

tags:

views:

answers:

How to register a new LLVM backend?

related questions