[Neurodebian-devel] any ideas why linking against gslcblas "doesn't work" on Ubuntus?

[Yaroslav Halchenko]

ah -- sorry, I should have followed up I guess.

Yes -- it is due to --as-needed although it should have not affected it
there since gslcblas was linked after as well... so who knows...

meanwhile I decided to not give up on --as-needed entirely and the fix
was to add "-Wl,--no-as-needed" right before  the -lgsl ...  which
usually was nearly the last among libraries to link.

similar dance was needed for Motif libraries, because libXm needs to be linked
before libXt (and possibly other X libraries).  With --as-needed linking of Xm
is deferred to the later point where any of its symbols are needed, and usually
that is after referencing any X symbols, thus it gets linked AFTER Xt leading
to incorrect operation.  So here is what I needed to do

-Wl,--no-as-needed ${MOTIF_LIBRARIES} -Wl,--as-needed

;)  thus enabling --as-needed even for Debian builds (where there is no
--as-needed by default) for all subsequently listed libraries... oh well -- it
should be only for the benefit, right? ;)

Cheers,

On Wed, 11 Sep 2013, Yury V. Zaytsev wrote:

> On Tue, 2013-09-03 at 08:59 -0400, Yaroslav Halchenko wrote:
> > Need input since can't figure it out myself... I am on a quest to
> > robustify our AFNI's builds.   Everything is working smooth on Debians
> > but all Ubuntus fail while linking against gsl/gslcblas -- it is like
> > if there were no -lgslcblas 

> Hi Yarik,

> Just a shot in the dark: it could be due to --as-needed enabled on
> Ubuntus by default. In order to disable it for the session try

>     export LDFLAGS="-Wl,--no-as-needed"

> Hope that helps and let me know if this worked,
-- 
Yaroslav O. Halchenko, Ph.D.
http://neuro.debian.net http://www.pymvpa.org http://www.fail2ban.org
Senior Research Associate,     Psychological and Brain Sciences Dept.
Dartmouth College, 419 Moore Hall, Hinman Box 6207, Hanover, NH 03755
Phone: +1 (603) 646-9834                       Fax: +1 (603) 646-1419
WWW:   http://www.linkedin.com/in/yarik