CODEWITHSUNDEEP
pythonc++macosdllclang
Siyuan Ren
Siyuan Ren

Reputation: 7844

How to solve the loading error of clang's Python binding?

I'm trying the Python binding for clang. I installed LLVM and its python bindings using homebrew on Mac OS X Maverics with command line

 brew install llvm --with-clang --with-python --with-lld

The loading code is

import clang
import clang.cindex

clang.cindex.Config.set_library_path('/usr/local/Cellar/llvm/3.5.0/lib')
index = clang.cindex.Index.create()

But this throws an error:

clang.cindex.LibclangError: dlopen(/usr/local/Cellar/llvm/3.5.0/lib/libclang.dylib, 6): Library not loaded: @rpath/libLLVM-3.5.dylib Referenced from: /usr/local/Cellar/llvm/3.5.0/lib/libclang.dylib Reason: image not found. To provide a path to libclang use Config.set_library_path() or Config.set_library_file().

But I don't understand why this error occurs. Doesn't @rpath here refers to /usr/local/Cellar/llvm/3.5.0/lib? But there is a file called libLLVM-3.5.dylib under that directory. Why does this loading cause an error and how to fix it?

Upvotes: 6

Views: 9339

Answers (2)

Maciej Skorski
Maciej Skorski

Reputation: 3354

A robust alternative is to use Config.set_library_path, works great in interactive Python (IPython, Jupyter) too.

from clang.cindex import Index,Config,CursorKind

# check where is LLVM installed on your machine (here on MacOS)
Config.set_library_path('/usr/local/Cellar/llvm/16.0.3/lib')

SCRIPT_PATH = './tcpdump/print-ppp.c'

# C99 is a proper compiler for tcpdump, as per their docs
index = Index.create()
translation_unit = index.parse(SCRIPT_PATH, args=['-std=c99'])

This is also recommended in docs.

Upvotes: 2

jxramos
jxramos

Reputation: 8266

Elevating @synthesizerpatel's comment to an answer:

Add the following environment variable to your environment:

 DYLD_LIBRARY_PATH=/usr/local/Cellar/llvm/3.5.0/lib/

The readme also mentions

You may need to alter LD_LIBRARY_PATH so that the Clang library can be found.

Upvotes: 2

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