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This project is no longer maintained and users are recommended to switch to llvmlite, which is developed by llvmpy maintainers and numba developers.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.
This package has been tested with LLVM 3.3, Python 2.6, 2.7, 3.3 and 3.4. Other Python versions may work.
Get and extract LLVM 3.3 source tarball from llvm.org. Then,
cdinto the extracted directory.
./configure --enable-optimized --prefix=LLVM_INSTALL_PATH.
Note: Without the
--enable-optimizedflag, 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_PATHwith your own path.
REQUIRES_RTTI=1 make installto build and install.
Note: With LLVM 3.3, the default build configuration has C++ RTTI disabled. However, llvmpy requires RTTI.
make -j2 installto enable concurrent build. Replace
2with the actual number of processor you have.
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()"
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:
Make sure both the system version of llvm and version 3.3 is installed:
$ sudo apt-get install llvm llvm-3.3
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
- 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.
- 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
- 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:
- 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.