Subject: Re: CVS commit: pkgsrc
To: Chris G. Demetriou <email@example.com>
From: Greg A. Woods <firstname.lastname@example.org>
Date: 09/28/2000 08:39:08
[ On , September 27, 2000 at 20:02:24 (-0700), Chris G. Demetriou wrote: ]
> Subject: Re: CVS commit: pkgsrc
> Bill Studenmund <email@example.com> writes:
> > No. What I was saying (and I'm sorry if it came out wrong) is this: say I
> > have a library which needs another library for some of its routines. If I
> > link in this library, but don't use any of the routines which need that
> > other library, why does the program need to have it linked in (or have its
> > absense be an error)?
> "that is the way of ELF shared libraries."
That was, unfortunately, the way of NetBSD's a.out shared libraries too,
but was not true on other similar systems, eg. SunOS-4.
As far as I can see it does not have to be true either. The linker need
not register all libraries listed on the command line -- only those
libraries which have been used to resolve symbols need to be registered
in the final binary.
> ELF shared libraries should link against all libraries that any of the
> routines that they contain depend on.
Specifying an uneeded library (i.e. one which is not used to resolve any
symbols) on the link command line should not ever cause a run-time
error if that library is not available in the run-time environment.
Greg A. Woods
+1 416 218-0098 VE3TCP <firstname.lastname@example.org> <robohack!woods>
Planix, Inc. <email@example.com>; Secrets of the Weird <firstname.lastname@example.org>