[Rd] Problems in building a DLL in 64-bit Windows

From: <ruipbarradas_at_sapo.pt>
Date: Mon, 12 Dec 2011 13:12:28 +0000

I am trying to build a C language DLL and it works well with i386 but when I compile with it substituted by x64, like the FAQ page says, the result is an error message:

C:/PROGRA~1/R/R-214~1.0/bin/x64/R.ddl: file not recognized : File format not recognized collect2: ld returned 1 exit status

How can I solve this? The problem is with R 2-14.0 and 2-13.0

The complete source code is

* myfun.c
#include <stdio.h>
#include <R.h>
#include <Rinternals.h>
#include <R_ext/Rdynload.h>

void myfn(double *x){ *x += 1; }

The DLL is build like this:

R CMD SHLIB -LC:/PROGRA~1/R/R-214~1.0/bin/x64 -lR myfun.c -o myfun64.dll

and get the error message above.

The R code:

# myfun.R: this works with i386, but not with x64

f <- function(x) {.C("myfn", x=as.double(x))$x} f(1)

I am trying to build a package, or at least a set of functions, and performance is sometimes a problem. Thank you,

Rui Barradas

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