Re: Linking against libldap_r instead of libldap?

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On Fri, 2013-06-28 at 14:31 +0800, Ian Kent wrote:
> On Thu, 2013-06-27 at 22:42 -0300, Leonardo Chiquitto wrote:
> > Hi,
> > 
> > I'm investigating one segmentation fault report (multiple occurrences)
> > in automount where the OpenSSL context (using LDAP with TLS) is
> > clearly corrupted. Reading OpenSSL documentation I found that the
> > the library needs to be correctly initialized in order to run in a multi-
> > threaded environment. I also found that *only* the reentrant build of
> > the OpenLDAP libraries (libldap_r) initialize openssl for multi-threading.
> > 
> > By default (since commit 04dfd15590a) automount is linked against
> > libldap (non-reentrant), but I failed to find the reason behind the change.
> > Could you help me understand why it shouldn't be linked against
> > libldap_r?
> 
> That was a long time ago, Jan 2008.
> Sorry, I don't remember why I committed that change.
> 
> TBH I always thought the re-entrant version of the library should be
> used so there must have been a case to justify not using it, I just
> can't remember what it was.
> 
> Not a good change log entry either .....

I've found a reference to the post this originated from:
http://www.mail-archive.com/autofs@xxxxxxxxxxxxxxxx/msg06499.html

I'm guessing the claim actually is that -D_REENTRANT should deal with
this although LDFLAGS contains -lpthread so perhaps this was actually a
problem with Mandriva.

In short:

Hello list.
Latest release (5.0.3) attempt to link against libldap_r, and fails on
mandriva because of unresolved pthread symbols. However, according to
ldap maintainer, libldap_r is supposed to be a private library. Hence
autofs should use -lldap, not -lldap_r. Attached patch fix this.
-- 
Guillaume Rousse
Moyens Informatiques - INRIA Futurs


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