[R] Shared libraries for use with R

[Giovanni Petris]

I am moving my first steps in writing and compiling C code and calling
it from R. (I am also new to shared libraries...) My
problem is that my C code uses a C function contained in 
another library (".a", not ".so" - is that the problem?). 

This is how I compile the file with the functions I want to call from R:

cd /export/home/gpetris/
R SHLIB tryit.c
cc -I/export/home/share/R/R-1.4.0/lib/R/include "-I/export/home/gpetris/C" -I/usr/local/include -I/export/home/share/include   -KPIC  -xO5 -dalign -xlic_lib=sunperf -c tryit.c -o tryit.o
cc -G  -o tryit.so tryit.o "-L/export/home/gpetris/lib/SUN/32bit -lutil -lrand" -L/usr/local/lib -L/export/home/share/lib  

Compilation finished at Fri Jan 18 12:45:20

So far, so good. But when I dyn.load it in R:

> dyn.load("tryit.so")
Error in dyn.load(x, as.logical(local), as.logical(now)) : 
	unable to load shared library "/export/home/gpetris/tryit.so":
  ld.so.1: /export/home/share/R/R-1.4.0/lib/R/bin/R.bin: fatal: relocation error: file /export/home/gpetris/tryit.so: symbol dmatrix: referenced symbol not found

The function dmatrix is contained in the object file nrutil.o in
the library /export/home/gpetris/lib/SUN/32bit/libutil.a
I was hoping that the flags given to R SHLIB could take care of that,
but apparently I was wrong...
What am I missing? Any help will be greatly appreciated.

Thank you in advance,
Giovanni

-- 

 __________________________________________________
[                                                  ]
[ Giovanni Petris                 GPetris at uark.edu ]
[ Department of Mathematical Sciences              ]
[ University of Arkansas - Fayetteville, AR 72701  ]
[ Ph: (501) 575-6324, 575-8630 (fax)               ]
[ http://definetti.uark.edu/~gpetris/              ]
[__________________________________________________]

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