Originally a github fork of the llvm-py repository from http://www.mdevan.org/llvm-py/index.html updated to work with LLVM 3.x. Since then it has changed significantly with multiple sub-projects.
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llvmpy: Python bindings for LLVM

Important Note: Use llvmlite instead

This project is no longer maintained and users are recommended to switch to llvmlite, which is developed by llvmpy maintainers and numba developers. For temporary compatibility with llvmpy, llvmlite emulates the some API of llvmpy. This compatibility layer is enough to allow numba to transition to llvmlite with minimal code changes. Keep in mind that this compatibility layer is temporary. New code should be written for the llvmlite API, which is not very different.

Home page



This package has been tested with LLVM 3.3, Python 2.6, 2.7, 3.3 and 3.4. Other Python versions may work.


  1. Get and extract LLVM 3.3 source tarball from llvm.org. Then, cd into the extracted directory.

  2. Run ./configure --enable-optimized --prefix=LLVM_INSTALL_PATH.

    Note: Without the --enable-optimized flag, debug build will be selected. Unless you are developing LLVM or llvmpy, it is recommended that the flag is used to reduce build time and binary size.

    Note: Use prefix to select the installation path. It is recommended to separate your custom build from the default system package. Please replace LLVM_INSTALL_PATH with your own path.

  3. Run REQUIRES_RTTI=1 make install to build and install.

    Note: With LLVM 3.3, the default build configuration has C++ RTTI disabled. However, llvmpy requires RTTI.

    Note: Use make -j2 install to enable concurrent build. Replace 2 with the actual number of processor you have.

  4. Get llvm-py and install it:

    $ git clone https://github.com/llvmpy/llvmpy.git
    $ cd llvmpy
    $ LLVM_CONFIG_PATH=LLVM_INSTALL_PATH/bin/llvm-config python setup.py install

    Note: Some OS has a default python that may install to system locations thus requiring root permission. In that case, use:

    $ LLVM_CONFIG_PATH=LLVM_INSTALL_PATH/bin/llvm-config python setup.py install --user

    Run the tests:

    $ python -c "import llvm; llvm.test()"
  5. See documentation at 'http://www.llvmpy.org' and examples under 'test'.

Ubuntu 14.04 installation instructions

To install llvmpy with pip on ubuntu 14.04, follow these steps:

  1. Make sure both the system version of llvm and version 3.3 is installed:

    $ sudo apt-get install llvm llvm-3.3
  2. Install the non-released package of llvmpy that has support for multiple versions of llvm (as described in #126):

    $ pip install https://pypi.python.org/packages/source/l/llvmpy/llvmpy-0.12.7-9-g60b512d.tar.gz

Common Build Problems

  1. If llvmpy cannot be imported due to "undefined symbol: _ZTIN4llvm24PassRegistrationListenerE", it is because RTTI is not enabled when building LLVM. "_ZTIN4llvm24PassRegistrationListenerE" is the typeinfo of PassRegistrationListener class.
  2. LLVM3.3 ssize_t mismatch on 64-bit Windows. Get patch from http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130701/180049.html
  3. OSX 10.9 Mavericks uses libc++ by default but Anaconda distributes LLVM binaries link with the old libstdc++. The two binaries are incompatible but there are no compile/link time warnings. The resulting binaries may generate segmentation fault at runtime (probably due to ABI mismatch). The Fix: Use the following c++ flags: -std=libstdc++ -mmacosx-version-min=10.6.
  4. OSX 10.10 user will need to change the Makefile of LLVM 3.3 due to a version match error. At line 574 of llvm3.3 Makefile.rules, modify DARWIN_VERSION := $(shell echo $(DARWIN_VERSION)| sed -E 's/(10.[0-9]).*/\1/') to DARWIN_VERSION := $(shell echo $(DARWIN_VERSION)| sed -E 's/(10.[0-9]+).*/\1/') (Note the extra "+" in the regex). See https://github.com/llvmpy/llvmpy/issues/130 for the original issue.


llvmpy is distributed under the new BSD license, which is similar to the LLVM license itself. See the file called LICENSE for the full license text.