[llvm-dev] Compiling a simple pass skeleton inside LLVM fails

[Max Muster via llvm-dev]

Hi folks,

I wanted to add a function pass inside the compiler. Therefore, I added the
following pass skeleton to the compiler (which works for an out-of-tree
compilation):

#include "llvm/Pass.h"

using namespace llvm;

namespace {
  class FooPass : public FunctionPass {
  public:
    static char ID;

    FooPass() : FunctionPass(ID) {
    }

    bool runOnFunction(Function &F) override;
  };
}

bool FooPass::runOnFunction(Function &F) {
  return false;
}

char FooPass::ID = 0;
INITIALIZE_PASS_BEGIN(FooPass, "foo",
                      "My little Foo Pass", false, false)
INITIALIZE_PASS_END(FooPass, "foo",
                    "My little Foo Pass", false, false)

FunctionPass *llvm::createFooPass() {
  return new FooPass();
}

However, when compiling the compiler, the initialization of the pass seems
not to be working because I get the following error messages:

In file included from /home/work/gitprojects/llvm/include/llvm/Pass.h:377:0,
                 from
/home/work/gitprojects/llvm/lib/Transforms/ancoder/foo_pass.cpp:1:
/home/work/gitprojects/llvm/include/llvm/PassSupport.h:81:63: error: ‘void
llvm::initializeFooPassPass(llvm::PassRegistry&)’ should have been declared
inside ‘llvm’
   void llvm::initialize##passName##Pass(PassRegistry &Registry) { \
                                                               ^
/home/work/gitprojects/llvm/lib/Transforms/ancoder/foo_pass.cpp:24:1: note:
in expansion of macro ‘INITIALIZE_PASS_END’
 INITIALIZE_PASS_END(FooPass, "foo",
 ^
/home/work/gitprojects/llvm/lib/Transforms/ancoder/foo_pass.cpp:27:35:
error: ‘llvm::FunctionPass* llvm::createFooPass()’ should have been
declared inside ‘llvm’
 FunctionPass *llvm::createFooPass() {
                                   ^

I already looked up other passes within the compiler, but do not see the
difference why it is working there and not here.

Can someone guide me how to fix this error?

Thanks and Cheers,
Max
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