Question

i’m trying to create an LLVM pass using the guide at http://llvm.org/releases/2.9/docs/WritingAnLLVMPass.html
but i’m having several problems:

• i haven’t many of the folder that are indicated into the guide (lib/Transform/Hello) and (Debug+Asserts), i have created them, is it right? what’s the right path?
  i create these: /usr/lib/llvm-2.9/lib/Transforms/Hello and /usr/lib/llvm-2.9/Debug+Asserts

• when i try to make the file in the guide i have error:

.

# Makefile for hello pass


# Path to top level of LLVM heirarchy
LEVEL = /usr/lib/llvm-2.9/build        #*********I MODIFY THIS!!!! ***************

# Name of the library to build
LIBRARYNAME = Hello

# Make the shared library become a loadable module so the tools can 
# dlopen/dlsym on the resulting library.
LOADABLE_MODULE = 1

# Tell the build system which LLVM libraries your pass needs. You'll probably
# need at least LLVMSystem.a, LLVMSupport.a, LLVMCore.a but possibly several
# others too.
LLVMLIBS = LLVMCore.a LLVMSupport.a LLVMSystem.a

# Include the makefile implementation stuff
include $(LEVEL)/Makefile.common

and i modify also other lines into Makefile.common:

ifndef LLVM_SRC_ROOT
include $(LEVEL)/Makefile.rules
else
include $(LLVM_SRC_ROOT)/Makefile.rules
endif

because it doesn’t find the Makefile.rules (in this way it works)

but now i have this error when i do make into the folder containing my hello.c file (/usr/lib/llvm-2.9/lib/Transforms/Hello):

make: ***  No rule to make target "/configure", needed by "/config.status".  Stop.

what’s the problem?!?

Answer 1

Apparently, it seems you’re trying to develop using the binary of the libraries. Unfortunately, this won’t work. You need to download sources, build them and then start developing your own pass.

Also, 2.9 is already too ancient. Consider at least upgrading to 3.0 release.