AMBER Archive (2007)

Subject: [Fwd: Re: AMBER: xleap patch for xorg-7.3 ??]

From: M. L. Dodson (activesitedynamics_at_comcast.net)
Date: Wed Nov 14 2007 - 12:51:35 CST

I sent this out last week, but it never appeared on the list.
So here we go again.

Bud Dodson

-------- Original Message --------
Subject: Re: AMBER: xleap patch for xorg-7.3 ??
Date: Fri, 09 Nov 2007 10:39:15 -0600
From: M. L. Dodson <activesitedynamics_at_comcast.net>
Reply-To: activesitedynamics_at_comcast.net
To: amber_at_scripps.edu
References: <47335DA5.7070408_at_comcast.net>
<20071109020339.GB4688_at_scripps.edu>
<dbb230210711090626n296bb537g9dd67c03ecd5b4f1_at_mail.gmail.com>

Xuebin Qiao wrote:
> Hi,
>
> The Xorg7 has been designed to a new modularized architecture instead of
> the old monolithic source tree. So it may break many old packages,
> especially for those are linked with hand-coded linker options.
>
> qxb
>
> On Nov 9, 2007 10:03 AM, David A. Case <case_at_scripps.edu
> <mailto:case_at_scripps.edu>> wrote:
>
> On Thu, Nov 08, 2007, M. L. Dodson wrote:
> >
> > I found the following patch to be necessary for successfully
> > linking xaLeap with xorg-7.3
> >
>
> > --- leap/src/leap/Makefile.orig 2007-10-03 09:59:
> 50.000000000 -0500
> > +++ leap/src/leap/Makefile 2007-11-08 12:08:59.000000000 -0600
> > @@ -114,7 +114,7 @@
> > # XlcDL.o(.text+0xe2): undefined reference to `dlsym'
> > #
> > XALEAP_LIB = ../Xraw/libXaw.a ../Wc/libWcLeap.a ../Xpm/libXpm.a \
> > - ../Xmu/libXmu.a $(XLIBS) -lXt -lXext -lSM -lICE -lX11 $(LM)
> -lpthread
> > + ../Xmu/libXmu.a $(XLIBS) -lXt -lXext -lSM -lICE -lX11 -lXau
> -lXdmcp $(LM) -lpthread
> >
> > OBJ = $(OA) $(OG) $(OO) $(OL)
> >
>
> Thanks for the report. But some more information might help:
>
> What is the error when you don't have -lXau -lXdmcp specified?
Do you
> undertstand why xorg-7.3 needs these but not other X-implementations?
>

Unresolved symbols in the link. No, although it may have
something to do with factoring the functionality of X,
contemporaneously at least, with the build factorization qxb
described above.

> (extra credit:) how standard are libXau and libXdmcp? They seem to
> be present
> on IRIX, Cygwin and Linuces, but I don't know about AIX or MacOS
> (for example).
>

I can speak only for recent FreeBSD X installs and MacOS 10.4.10
(my laptop). On the mac, xdpyinfo says it is XFree86 4.4.0, and
it is at least two years since I installed it (several OS minor
version upgrades since then). I.e., it predates the xorg split
from XFree86, I think. Both libs present on these OS types.

> These "standard X" libraries are ancient...why would xorg move
> things around
> in a way almost guaranteed to break old programs?
>

The ABI is probably still intact, but the implementations may now
call functions in the new libs. This may be associated with the
functionality factorization I implied above.

> I'm happy to make the above patch if it is safe for all machines.
> Otherwise,
> we'll have to add code to the configure script to special-case this
> out.
>
> ...dac
>

If I may make a suggestion, rather than hack the configure script,
why not limit the fix to the makefile in the patch? Something along
the line of:

XALEAP_LIB = ../Xraw/libXaw.a ../Wc/libWcLeap.a ../Xpm/libXpm.a \
           ../Xmu/libXmu.a $(XLIBS) -lXt -lXext -lSM -lICE -lX11
<test for the existence of the libs>
if (libs present)
    XALEAP_LIB += -lXau -lXdmcp $(LM) -lpthread
else
    XALEAP_LIB += $(LM) -lpthread

My SysV make-foo is not up to this test (I'm a Berkeley make kind
of guy), but this should be possible, at least for gmake, I would
think.

The only corner case I can think of that this might miss is a
partial or messed up X installation. It may give a misleading
error message in that case.

Bud Dodson 

-- 
M. L. Dodson
Business Email: activesitedynamics-at-comcast-dot-net
Personal Email:	mldodson-at-comcast-dot-net
Phone:	eight_three_two-56_three-386_one
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