Radial.o : Error LNK2001: Unresolved External Symbol Lambda_fatal Error LNK1120: 8 Unresolved Externals,error.failed With Exit Status 1120

I am running an open-source package that has some codes in Python 3.7 mixed with Fortran FOR . I use Visual Studio 2019 and Intel Parallel Studio 2019 integrated.so when I run in I

Solution 1:

Edit: If you are using an open-source package there may be instructions for how to compile your program, what system setup is required (os, compilers), etc. There may be a "make" file that can be used.

There are many warnings/error messages here. My suggestion is to begin by making sure that the subroutines called by rad_fun are available during the build process. If the missing "utility" functions are not found in the source file with rad_fun, they should be contained in one or more separate files included with the package.

Try placing lambda_ and each of the other "utility" subroutines used by rad_fun into a module at the beginning of your source code. Then USE that module within rad_fun and attempt to compile. For example:

module my_module
  implicit none
  contains
  subroutine lambda_(arg1,arg2)
    ...
  end subroutine lambda_
end module my_module

subroutine rad_fun(arg1,arg2...)
  use my_module
  ...
end subroutine rad_fun 

Solution 2:

radial.for first lines edited:

MODULE my_module
IMPLICIT NONE 
CONTAINS
  INCLUDE 'lib.for' 
END MODULE 
…
 SUBROUTINE rad_fun (kob, m, ne, C2, KSI0, EPS, R1f, R1d, R2f,R2d)
      USE my_module
...

command f2py -c radial.for

radial.for: so the error disappeared

After definition of subroutine

COMPLEX*16  bdc9

When I want to call function

bdc9=CMPLX(C2,0.0)
      call lambda(K,M,ne,bdc9,EPS,rlc2,ie)