Intel® Fortran Compiler XE 13.1 User and Reference Guides
The ATTRIBUTES directive option EXTERN specifies that a variable is allocated in another source file. EXTERN can be used in global variable declarations, but it must not be applied to dummy arguments. It takes the following form:
cDEC$ ATTRIBUTES EXTERN :: var
c |
Is one of the following: C (or c), !, or *. (See Syntax Rules for Compiler Directives.) |
var |
Is the variable to be allocated. |
This option must be used when accessing variables declared in other languages.