Reference Number : DPD200139304


Version : 11.1


Operating System : All


Problem Description : The compiler will incorrectly issue diagnostic 6405: The same named entity from different modules and/or program units cannot be referenced, in the following situation:

1. A procedure (subroutine or function) is declared with an implicit interface (just a type and/or EXTERNAL) in a module.
2. A program unit USEs the module and calls the procedure twice or more.
3. The application is compiled with the generated interface checking feature enabled. (From the command line, the option /warn:interface (Windows) or -warn interface (Linux and Mac OS X); in the Visual Studio development environment, property Fortran > Diagnostics > Check Routine Interfaces is set to Yes.)

Example:

module MYMOD
logical, external :: func
end module MYMOD

program MAIN
use MYMOD
print *, FUNC(0)
print *, FUNC(1)
end program MAIN

Resolution Status : This error will be corrected in a future product version. The simplest workaround is to recode the declaration in the module as an INTERFACE block.  For example:

module MYMOD
interface
logical function FUNC (ARG)
integer, intent(IN) :: ARG
end function FUNC
end interface
end module MYMOD

If the procedure is written in Fortran, a preferable alternative is to place it in the module as a module procedure. This avoids the need to write a separate declaration of the procedure, but does require that any caller USE the module.

For information on other causes of this error, see Diagnostic 6405: The same named entity from different modules and/or program units cannot be referenced.



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