delocate 0.2.0

Move OSX dynamic libraries into package

Delocate

OSX utilities to:

• find dynamic libraries imported from python extensions

• copy needed dynamic libraries to directory within package

• update OSX install_names and rpath to cause code to load from copies of libraries

Provides scripts:

• delocate-listdeps – show libraries a tree depends on

• delocate-path – copy libraries a tree depends on into the tree and relink

• delocate-wheel – rewrite wheel having copied and relinked library dependencies into the wheel tree.

Warning

Please be careful - this software is alpha quality and has not been much tested in the wild. Make backups of your paths and wheels before trying the utilities on them, please report any problems on the issue tracker (see below).

The problem

Let’s say you have built a wheel somewhere, but it’s linking to dynamic libraries elsewhere on the machine, so you can’t distribute it, because others may not have these same libraries. Here we analyze the dependencies for a scipy wheel:

$ delocate-listdeps scipy-0.14.0b1-cp34-cp34m-macosx_10_6_intel.whl
/usr/local/Cellar/gfortran/4.8.2/gfortran/lib/libgcc_s.1.dylib
/usr/local/Cellar/gfortran/4.8.2/gfortran/lib/libgfortran.3.dylib
/usr/local/Cellar/gfortran/4.8.2/gfortran/lib/libquadmath.0.dylib

By default, this does not include libraries in /usr/lib and /System. See those too with:

$ delocate-listdeps --all scipy-0.14.0b1-cp34-cp34m-macosx_10_6_intel.whl
/System/Library/Frameworks/Accelerate.framework/Versions/A/Accelerate
/usr/lib/libSystem.B.dylib
/usr/lib/libstdc++.6.dylib
/usr/local/Cellar/gfortran/4.8.2/gfortran/lib/libgcc_s.1.dylib
/usr/local/Cellar/gfortran/4.8.2/gfortran/lib/libgfortran.3.dylib
/usr/local/Cellar/gfortran/4.8.2/gfortran/lib/libquadmath.0.dylib

The output tells me that scipy has picked up dynamic libraries from my homebrew installation of gfortran (as well as the system libs).

Warning

If you see any dependencies starting with @ in a wheel that has not yet been processed with delocate-wheel, the delocation process below will likely not work, and leave you with - er - a broken wheel.

A solution

We can fix like this:

$ delocate-wheel -w fixed_wheels -v scipy-0.14.0b1-cp34-cp34m-macosx_10_6_intel.whl
Fixing: scipy-0.14.0b1-cp34-cp34m-macosx_10_6_intel.whl
Copied to package .dylibs directory:
/usr/local/Cellar/gfortran/4.8.2/gfortran/lib/libgcc_s.1.dylib
/usr/local/Cellar/gfortran/4.8.2/gfortran/lib/libgfortran.3.dylib
/usr/local/Cellar/gfortran/4.8.2/gfortran/lib/libquadmath.0.dylib

The -w flag tells delocate-wheel to output to a new wheel directory instead of overwriting the old wheel. -v (verbose) tells you what delocate-wheel is doing. In this case it has made a new directory in the wheel zipfile, named scipy/.dylibs. It has copied all the library dependencies that are outside the OSX system trees into this directory, and patched the python .so extensions in the wheel to use these copies instead of looking in /usr/local/Cellar/gfortran/4.8.2/gfortran/lib.

Check the links again to confirm:

$ delocate-listdeps fixed_wheels/scipy-0.14.0b1-cp34-cp34m-macosx_10_6_intel.whl
@loader_path/libgcc_s.1.dylib
@loader_path/libquadmath.0.dylib
@rpath/libgcc_s.1.dylib
@rpath/libgfortran.3.dylib
@rpath/libquadmath.0.dylib

So - system dylibs the same, but the others moved into the wheel tree.

This makes the wheel more likely to work on another machine which does not have the same version of gfortran installed - in this example.

Code

See https://github.com/matthew-brett/delocate

Released under the BSD two-clause license - see the file LICENSE in the source distribution.

travis-ci kindly tests the code automatically under Python 2.7, 3.3 and 3.4.

The latest released version is at https://pypi.python.org/pypi/delocate

Support

Please put up issues on the delocate issue tracker.