R help - Jan 2000 - dyn.load problem

Hi,

I'm trying to write modified versions of R save/load functions which read
from/write to a char array instead of a file pointer. I want to compile
my functions into a library and dyn.load them. Of course the new functions
mySave/Load will use some of the internal R functions used by save/load,
for example  "MarkSave" (to be found in .../src/main/saveload.c). I
declared them as

external  void MarkSave(SEXP s);
....

in my code. When I do dyn.load("myLib.so") I get the error

Error in dyn.load(x, as.logical(local), as.logical(now)): unable to load shared
 library "myLib.so":
  myLib.so: undefined symbol: MarkSave

Can't I use R internals other than those visible in $R_HOME/include?


Thanks for some clarifying hints

--  Dr. Joerg Kindermann             GMD - AiS
            German National Research Center for Information Technology
                Schloss Birlinghoven, D-53754 St. Augustin, Germany
                   phone: +49 02241 142437 fax: +49 02241 142342
 
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On 17-Jan-00 Joerg Kindermann wrote:
> Hi,
> 
> I'm trying to write modified versions of R save/load functions which
read
> from/write to a char array instead of a file pointer. I want to compile
> my functions into a library and dyn.load them. Of course the new functions
> mySave/Load will use some of the internal R functions used by save/load,
> for example  "MarkSave" (to be found in .../src/main/saveload.c).
I
> declared them as
> 
> external  void MarkSave(SEXP s);
> ....
> 
> in my code. When I do dyn.load("myLib.so") I get the error
> 
> Error in dyn.load(x, as.logical(local), as.logical(now)): unable to load
> shared
>  library "myLib.so":
>   myLib.so: undefined symbol: MarkSave
> 
> Can't I use R internals other than those visible in $R_HOME/include?
MarkSave is declared static in saveload.c, so it's not surprising you
can't access it.  In general you are probably better off using only the
functions declared in, e.g., Rinternals.h, since this defines an interface
to R.

Martyn
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