[S] Dynamic Load in S-PLUS 3.3 for DEC alpha, OSF1 V3.2

["Paul Y. Peng" <ypeng@math.mun.ca>]

Dear S-PLUS users,

I am looking for the experience of making dynamically loadable
shared library for S-PLUS 3.3 (Release 1 for DEC alpha, OSF1 V3.2).

I have tried the sample program in the S-PLUS manual book as
follows (sample.c)


        #include <S.h>
        void my_sum(double *x, long *n, double *sum)
        {
                long i;

                *sum = 0 ;
                for (i = 0 ; i < *n ; i++)
                        if (is_na(x[i], DOUBLE)) {
                                na_set(sum, DOUBLE);
                                break;
                        }
                        else *sum += x[i];
        }


If I compile it by "Splus SHLIB sample.c", I get following message:
        
        targets= -f /math/packages/splus33/newfun/lib/S_soMakefile sample.so
        make -f /math/packages/splus33/newfun/lib/S_makefile  -f                
/math/packages/splus33/newfun/lib/S_soMakefile sample.so
        "SHLIB=sample.so" "OBJS= sample.o"
        cc -c -taso -ieee_with_no_inexact -I${SHOME-`Splus SHOME`}/include  
-Olimit 3500 -O4 sample.c
        ld -o sample.so -shared  sample.o
        ld:
        Warning: Unresolved:
        test_na
        set_na
        __exc_add_pc_range_table
        __exc_remove_pc_range_table
        __exc_add_gp_range
        __exc_remove_gp_range
        sample.so

I can load sample.so by

        dyn.load.shared("./sample.so", symbols=symbol.C("my_sum"))

but if I use it in .C(), I get an error message "System terminating:
bad address" and S-PLUS terminates. I think the error is caused by
the unknown references. However, I couldn't figure out how to resolve
the unknown references. I thought the unknown references should be in
a file named Sqpe.so and it should be linked by ld when creating
sample.so, but there is no such or similar file in the SHOME
directory.

I found this problem when I tried to port my C programs to DEC alpha
OSF1 from Sun Solaris. Any advice is highly appreciated.

Thanks.

Paul.
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