On Sun, Feb 7, 2016 at 2:19 PM, Robert T. McGibbon <rmcgi...@gmail.com> wrote: >> One option we have then is to remove all DT_NEEDED references to > libpython in manylinux wheels. We get instant compatibility for bare > Debian / Ubuntu Python installs, at the cost of causing some puzzling > crash for the case of: dlopened library with embedded Python > interpreter where the embedded Python interpreter imports a manylinux > wheel. > > I don't think this is acceptable, since it's going to break some packages > that depend > on dlopen. > >> On the other hand, presumably this same crash will occur for nearly > all Debian-packaged Python extension modules (if it is true that they > do not specify a libpython dependency) - so it seems unlikely that > this is a common problem. > > I don't think so. Debian-packaged extensions that require libpython to exist > (a minority of them to be sure, but ones that use complex shared library > layouts) > just declare a dependency on libpython. For example, python-pyside has a > Depends on libpython2.7: > > ``` > $ apt-cache depends python-pyside.qtcore > python-pyside.qtcore > Depends: libc6 > Depends: libgcc1 > Depends: libpyside1.2 > Depends: libpython2.7 > Depends: libqtcore4 > Depends: libshiboken1.2v5 > Depends: libstdc++6 > Depends: python > Depends: python > Conflicts: python-pyside.qtcore:i386 > ```
Sure - and this might be because the pyside packager was being especially careful about libpython, or it might be an accident - pyside is hard to build. On the other hand, it looks like almost all the common Debian packages don't declare this dependency - so almost all of the standard scientific Python stack and more would crash in this corner case: apt-cache depends python-numpy | grep libpython apt-cache depends python-scipy | grep libpython apt-cache depends python-yaml | grep libpython apt-cache depends python-regex | grep libpython apt-cache depends python-matplotlib | grep libpython It seems reasonable to build to the same compatibility level as most Debian packaged modules. Matthew _______________________________________________ Distutils-SIG maillist - Distutils-SIG@python.org https://mail.python.org/mailman/listinfo/distutils-sig
