[Bug 1572328] Re: libpython2.7 linked but not loaded

[Matthias Klose]

On 20.04.2016 15:14, JPi wrote:
> Is it possible to access the config.log of the libraries shipped for
> Ubuntu?

just rebuild a package in a clean chroot.

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Title:
  libpython2.7 linked but not loaded

Status in python2.7 package in Ubuntu:
  Won't Fix

Bug description:
  It started in this question https://answers.launchpad.net/ubuntu/+source/python2.7/+question/291321
  A program linkedagainst libpython2.7 will still fail to find symbols defined there. It seems libpython2.7 is not compiled using enable-shared.

  Very similar to the problem described here

  https://bugs.kde.org/show_bug.cgi?id=330032

  By adding LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 in
  our environment before running the program solves the issue but this
  is not a solution, just a workaround.

  The thing is that in Debian this doesn't happen, but it also happens in Fedora
  https://bitbucket.org/mtmiller/pytave/issues/3/dlopen-hack

  > uname -a

  Linux AsusK55VJ-ubuntu 4.2.0-35-generic #40-Ubuntu SMP Tue Mar 15
  22:15:45 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

  > lsb_release -crid

  Distributor ID:	Ubuntu
  Description:	Ubuntu 15.10
  Release:	15.10
  Codename:	wily

  > grep libpython2.7 /etc/ld.so.cache

  Binary file /etc/ld.so.cache matches

  > grep x86_64-linux-gnu /etc/ld.so.conf

  nothing

  > ls -l /usr/lib/x86_64-linux-gnu/libpython2.7*

  lrwxrwxrwx 1 root root 51 Okt 14 2015 /usr/lib/x86_64-linux-gnu/libpython2.7.a -> ../python2.7/config-x86_64-linux-gnu/libpython2.7.a
  lrwxrwxrwx 1 root root 19 Okt 14 2015 /usr/lib/x86_64-linux-gnu/libpython2.7_d.so -> libpython2.7_d.so.1
  lrwxrwxrwx 1 root root 21 Okt 14 2015 /usr/lib/x86_64-linux-gnu/libpython2.7_d.so.1 -> libpython2.7_d.so.1.0
  -rw-r--r-- 1 root root 6733568 Okt 14 2015 /usr/lib/x86_64-linux-gnu/libpython2.7_d.so.1.0
  lrwxrwxrwx 1 root root 17 Okt 14 2015 /usr/lib/x86_64-linux-gnu/libpython2.7.so -> libpython2.7.so.1
  lrwxrwxrwx 1 root root 19 Okt 14 2015 /usr/lib/x86_64-linux-gnu/libpython2.7.so.1 -> libpython2.7.so.1.0
  -rw-r--r-- 1 root root 3574616 Okt 14 2015 /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0

  And just to ratify that the library we build indeed is linked against
  libpython

  ldd pyeval.oct | grep python
   libboost_python-py27.so.1.58.0 => /usr/lib/x86_64-linux-gnu/libboost_python-py27.so.1.58.0 (0x00007f907b7ce000)
   libpython2.7.so.1.0 => /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 (0x00007f907b254000)

  Thanks

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