LLVM opt cannot find function pass - c++

Question

Given the following function pass definition and registration:
// STL
#include <map>
#include <vector>
#include <utility>
// LLVM
#include <llvm/Pass.h>
#include <llvm/IR/LLVMContext.h>
#include <llvm/IR/Function.h>
#include <llvm/IR/Instruction.h>
#include <llvm/IR/Instructions.h>
#include <llvm/IR/CFG.h>
#include <llvm/Support/raw_ostream.h>
#include <llvm/IR/InstIterator.h>
#include <llvm/IR/Constants.h>
// For older versions of llvm you may have to include instead:
// #include "llvm/Support/CFG.h"
// #include <llvm/Support/InstIterator.h>
using namespace llvm;
namespace {
class DefinitionPass : public FunctionPass {
public:
static char ID;
DefinitionPass() : FunctionPass(ID) {}
virtual void getAnalysisUsage(AnalysisUsage &au) const {
au.setPreservesAll();
}
virtual bool runOnFunction(Function &F) {
// TODO
errs() << "def-pass\n";
return false;
}
};
class FixingPass : public FunctionPass {
public:
static char ID;
FixingPass() : FunctionPass(ID){}
virtual bool runOnFunction(Function &F){
// TODO
errs() << "fix-pass\n";
return true;
}
};
} // namespace
char DefinitionPass::ID = 0;
char FixingPass::ID = 1;
// Pass registrations
static RegisterPass<DefinitionPass> X("defpass", "Reaching definitions pass");
static RegisterPass<FixingPass> Y("fixpass", "Fixing initialization pass");
I compile this given the following makefile. The compilation is successful:
CXXFLAGS = -rdynamic $(shell llvm-config --cxxflags) -g -O0 -std=c++0x
all: p34.so
%.so: %.o
$(CXX) $(CXXFLAGS) -dylib -shared -fPIC $^ -o $#
clean:
rm -f *.o *~ *.so
Then I create the bitcode file for the file I want to analyse using:
clang -O3 -emit-llvm test1.c -c -o test1.bc
And use opt in the following way:
opt -load p34.so -defpass < test1.bc > /dev/null
But opt is unable to find the function pass "defpass":
opt: Unknown command line argument '-defpass'. Try: 'opt --help'
I'm on OSX and use the homebrew installed LLVM version.
Does anbody have an idea why opt cannot find the pass?

Answer 1

.so Files are for Linux/Unix. On MAC you should be using p34.dylib
Quoting "https://github.com/banach-space/llvm-tutor"
"Finally, run HelloWorld with opt (use libHelloWorld.so on Linux and libHelloWorld.dylib on Mac OS):"