R-beta: .C and dyn.load for Windows

[Goran Brostrom]

Dear R-users,

I maintain software for survival analysis written in C and Fortran since
many years ago. Recently I have rewritten part of it as functions to
be called from R by .C. This works fine with the unix version. I just
create a ".so" file as described in an example in the R distribution.

However, when I try this approach in Windows (NT or 95), using the 
Cygnus gcc latest version, the "ld" command to create the ".so" file fails
miserably. The Windows R documentation talks about "DLL"s, of which I
know very little.

Can anyone tell me how to create R-loadable C-code with Cygnus gcc under
Windows (NT, 95)?
Maybe it isn't possible?

Goran Brostrom
Dept. of Statistics
Umea University
Umea, Sweden

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