From bates@stat.wisc.edu  Thu Apr  2 19:36:56 1998
From: bates@stat.wisc.edu (Douglas Bates)
Date: 02 Apr 1998 12:36:56 -0600
Subject: f2c
In-Reply-To: Paul Gilbert's message of Thu, 2 Apr 1998 13:15:48 -0500
References: <98Apr2.132201est.13448@mailgate.bank-banque-canada.ca>
Message-ID: <6rlntot6if.fsf@verdi.stat.wisc.edu>

Paul Gilbert <pgilbert@bank-banque-canada.ca> writes:

> I have a problem with my dynamically loaded code in R not finding pow_ii, which
> for some time I thought was because library f2c is not on my Sparcstation.
> However, I have now been experiencing the same problem in Linux, with all the
> proper libraries in place.
> 
> My incomplete understanding of elf and shared libraries does not help, but when
> compiling a complete program I usually muddle through. However, in the case of
> dynamically loading code into R, I am not sure whether it is my dse.so or R
> which should have the knowledge of where to find /usr/lib/libf2c.so*. I haven't
> had much success trying to configure so that that information is in dse.so. None
> of the usual things seem to help, so I suspect R itself needs to be able to find
> the library. If someone can explain this I would very much appreciate it.

One thing you can do is to check the R.binary file with "nm -g" to find
out what symbols are defined in it.  On my machine R.binary includes
pow_dd and pow_di but not pow_ii.

$ nm -g R.binary
...
08108c30 T pnt
         U popen
080ef370 T pow_dd
080ef460 T pow_di
08106c80 T ppois
...

This means that you will have to include a reference to the f2c library
when you are making the dse.so object.  I'm not sure of the sequence
invoked by "R INSTALL dse" but it may be that you can override the
library specification in the makefile by exporting an appropriate
value for the environment variable SHLIBLDFLAGS.
-- 
Douglas Bates                            bates@stat.wisc.edu
Statistics Department                    608/262-2598
University of Wisconsin - Madison        http://www.stat.wisc.edu/~bates/
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f2c
Douglas Bates