Question

I made a simple fortran routine

subroutine add(x,y)
    real(8) :: x,y

    y = x + 3
end subroutine

saved as test.f90.

I compile with

gfortran -shared test.f90 -o test.so

In R (in the same directory), I use

dyn.load('test.so')

but it gives me this error:

Error in dyn.load("test.so") : 
  unable to load shared object '/Users/Steven/Documents/PhD/npsR/test.so':
  dlopen(/Users/Steven/Documents/PhD/npsR/test.so, 6): Symbol not found: ___addtf3
  Referenced from: /usr/local/gfortran/lib/libquadmath.0.dylib
  Expected in: /Library/Frameworks/R.framework/Resources/lib/libgcc_s.1.dylib
 in /usr/local/gfortran/lib/libquadmath.0.dylib

Does anyone know why? I’m using mac osx Lion, with R v2.15.0 and gfortran 4.6.2.

Thank you!

Answer 1

Unless you really understand what you’re doing, you should use gfortran that comes with R tools. The missing symbol in libgcc isn’t surprising since you’re trying to run code compiled with a 4.6 gfortran in a 4.2 runtime environment.