The Compile-Link-Run Cycle --- .mod Files

On compilation of a Module:

• an object (.o) file;
  
  
• a module information --- .mod --- file also (.M file with v4.2);

Module Information Files

• contains information about module interfaces, i.e., the public subroutines and functions, and their respective arguments;
• .mod files are the compilers' way of implementing the required explicitness of module subroutines and functions.

Compilation

In general:

    f90 -M <.mod file path> <src files> -o <output file>