The ATTRIBUTES directive options DLLEXPORT and DLLIMPORT define a dynamic-link library's interface for processes that use them. The options can be assigned to module variables, COMMON blocks, and procedures. These directive options are available on Windows* and Mac OS* X systems. They take the following forms:
cDEC$ ATTRIBUTES DLLEXPORT :: object[, object] ...
cDEC$ ATTRIBUTES DLLIMPORT :: object[, object] ...
c |
Is one of the following: C (or c), !, or *. (See Syntax Rules for Compiler Directives.) |
object |
Is the name of a module variable, COMMON block, or procedure. The name of a COMMON block must be enclosed in slashes. |
DLLEXPORT and DLLIMPORT define the interface for the following dynamic-link libraries:
DLL on Windows* OS
DYLIB on Mac OS* X
DLLEXPORT specifies that procedures or data are being exported to other applications or dynamic libraries. This causes the compiler to produce efficient code; for example, eliminating the need on Windows OS for a module definition (.def) file to export symbols.
DLLEXPORT should be specified in the routine to which it applies.
Symbols defined in a DLL are imported by programs that use them. On Windows* OS, the program must link with the DLL import library (.lib).
The DLLIMPORT option is used inside the program unit that imports the symbol. DLLIMPORT is specified in a declaration, not a definition, since you cannot define a symbol you are importing.
Building Applications: Creating and Using Fortran DLLs Overview, for details on working with DLL applications
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