Re: molehill ----> mountain

[Gary V . Vaughan]

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On 1 Apr 2004, at 00:38, Bob Friesenhahn wrote:
> On Thu, 1 Apr 2004, Gary V.Vaughan wrote:
>
> > Now that we don't RTLD_GLOBAL anymore there is no reason for internal
> > apis
> > to leak into libltdl clients... :-)
>
> You are missing the distinction between libltdl and the modules it
> loads.  Global symbols from libltdl will always permeate dependent
> applications. :-)

It's late :-()

Pop quiz:  libltdl is a client of xmalloc from libltdl/xalloc.c, and 
libm4
is a client of gnulib/xmalloc.c.  Both define xmalloc(), with different
semantics, but the same prototype. m4 itself links both libraries.  m4.h
declares gnulib/xmalloc.c's xmalloc, but ltdl.h doesn't declare anything
from libltdl/xalloc.c.  What happens if m4's main() calls xmalloc()?

I guess you're saying that execution could end up in either :-(  This is
exactly what weak symbols are for isn't it?  I imagine they are not 
portable
enough to be used in libltdl though.  Ack.

Cheers,
        Gary.
- --
Gary V. Vaughan      ())_.  address@hidden,gnu.org}
Research Scientist   ( '/   http://tkd.kicks-ass.net
GNU Hacker           / )=   http://www.gnu.org/software/libtool
Technical Author   `(_~)_   http://sources.redhat.com/autobook

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