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Re: -dlopen self on AIX

From: Albert Chin
Subject: Re: -dlopen self on AIX
Date: Sun, 30 Oct 2005 14:11:51 -0600
User-agent: Mutt/1.5.6i

On Sun, Oct 30, 2005 at 11:38:26AM -0800, Howard Chu wrote:
> Albert Chin wrote:
> >On Sun, Oct 30, 2005 at 11:14:14AM -0600, Albert Chin wrote:
> >>[snip ...]
> >>
> >>This means the method libtool uses to support -dlopen self on AIX
> >>won't work (by building a list of symbols into some xxS.o file and
> >>linking it with the executable). The real solution is to -bE the
> >>symbol list. What's the cleanest way to do this?
> >>
> >>Dynamic module support in openldap-2.3.x isn't working on AIX for the
> >>above reason. Using -bexpall or -bE when linking the main binary does
> >>work though. While the main binary, slapd, doesn't dlopen itself,
> >>modules it dlopen()'s cannot resolve symbols in slapd because they
> >>weren't exported.
> >
> >Seems the openldap folks should really use -export-dynamic, which
> >isn't defined for AIX. We could make it -bexpall but as documented in
> >the previous mail, it doesn't export everything. So, should we create
> >a new variable, export_dynamic_cmds? If so, and temporary files are
> >created by it, how do we clean up?
> Wait. The fact that -bexpall "doesn't export everything" is A Good 
> Thing. Symbol tables on AIX include a lot of junk that other modules 
> simply don't need to see. The symbols they omit are generally not useful 
> for user code anyway.

It might be a "A Good Thing" in terms of being "pure", but it's
different than the behavior on Solaris, HP-UX, Tru64 UNIX, IRIX, and
Linux. It's just not worth it being that different today. AIX
certainly has no advantage because of it.

albert chin (address@hidden)

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