create R package include Fortran source code.

Hello, all

I am building a R package using Fortran source code. The Fortran code is a
subroutine. I can use "R CMD SHLIB  bar.f -o bar.o" to create the shared
library. For the R package, I put the fortran file in the src/ and I use R
code as follows:

".First.lib"<-function(libname,pkgname){library.dynam("barpkg",pkgname,libname)}
barfun<-function(n,x){
   .Fortran("bar",as.integer(n),as.double(x))
}
package.skeleton(name="barpkg",list=c("barfun"))
--------------------------------------------------------------------------
I can build with "R CMD build barpkg", when I check the package with "R CMD
check barpkg", there is an error,

** R
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
*** arch - i386
Error in inDL(x, as.logical(local), as.logical(now), ...) :
   unable to load shared object
'c:/Users/emily/Desktop/rtest/barpkg.Rcheck/barpkg/libs/i386/bar.dll':
   LoadLibrary failure:  %1 is not a valid Win32 application.

create R package include Fortran source code.

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