[Bug 518653] [NEW] libopie exports conflicting symbols

[Simon Schubert]

Public bug reported:

libopie.a exports the functions md5_init, md5_append and md5_finish.
These are quite common names that should be avoided by a central
library.  The problem arises when any binary that also uses these symbol
names is linked to libopie.a, especially when this happens indirectly.

Concretely, I ran into a problem when trying to use dovecot with libpam-
opie.  pam_opie.so contains (part of) libopie.a, and thus also the
global functions md5_init, etc.  Dovecot contains md5_init, md5_update
and md5_finish as global functions.  Note that libopie and dovecot
differ in md5_append vs md5_update, yet share the other function names.

As a result, pam_opie.so will use part dovecot functions (per standard
plt resolution), and part its own (since md5_append is not defined my
dovecot).  That results in an invalid md5 calculation and thus in failed
authentication.

Possible solution:
libopie.a should not export such common names, and instead prefix them appropriately.  Alternatively use hidden visibility if applicable.


Description:	Ubuntu 9.10
Release:	9.10

libopie-dev:
  Installed: 2.40~dfsg-0ubuntu1
  Candidate: 2.40~dfsg-0ubuntu1
  Version table:
 *** 2.40~dfsg-0ubuntu1 0
        500 http://ch.archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status
libpam-opie:
  Installed: 0.21-8build2
  Candidate: 0.21-8build2
  Version table:
 *** 0.21-8build2 0
        500 http://ch.archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status

** Affects: opie (Ubuntu)
     Importance: Undecided
         Status: New

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libopie exports conflicting symbols
https://bugs.launchpad.net/bugs/518653
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