[R] [r] Problems with Fortran calls when loaded a dll compiled with gfortran-4 Cygwin 4.5.3

[Duncan Murdoch]

On 13-04-24 1:36 PM, Jens Olofsson wrote:
> Dear users of R
> I have a subroutine in Fortran95, compiled to a DLL with gfortran in Cygwin
> 4.5.3.

We don't support Cygwin.  You should use the gfortran in Rtools, and get 
R to set the command line options for you, either by putting the code in 
a package, or by using R CMD SHLIB Mango.f95.

Duncan Murdoch

> The subroutine is:
> subroutine MyPBP( S, p, N )
>      ! Expose subroutine rtest to users of this DLL
>      !DEC$ ATTRIBUTES DLLEXPORT, C, REFERENCE, ALIAS: "mypbp_" ::mypbp
>      ! This function computes the Poisson-Binomial distribution
>      ! of size N using p
>      double precision, intent(inout) :: S(N+1)
>      double precision, intent(in) :: p(N)
>      integer, intent(in) :: N
>      double precision :: X(N+1)
>      integer i, j
>      !X=0
>      !S=0
>      X(1) = 1 - p(1)
>      X(2) = p(1)
>      do i = 2, N
>          S(1) = X(1)*(1-p(i))
>          do j = 2,i
>              S(j) = X(j-1)*p(i) + X(j)*(1-p(i))
>          end do
>          S(i+1) = X(i)*p(i)
>          X = S
>          if (i == N) then
>              S = X
>          end if
>      end do
> end subroutine MyPBP
> and it is saved into Mango.f95
> I compile it from the bash shell using: gfortran-4 c- Mango.f95 and
> gfortran-4 -shared -o Mango.dll Mango.o
> I am on a Windows machine running Windows 7 with Intel i7.
> I load the dll in a 32-bit R by dyn.load("Mango.dll"). Using getLoadedDLLs
> I can see the DLL. However, is.loaded("Mango.dll") = FALSE. In addition, R
> stop responding when I try .Fortran("MyPBP", as.numeric(S), as.numeric(p),
> as.integer(N)),
> where N<-5, S<-array(0,N+1) and p<- c(0.1, 0.2, 0.5, 0.8, 0.9).
>
> What am I doing wrong?
> Any ideas, thoughts and/or comments are highly appreciated.
>
> Jens
>
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