[Bug fortran/42607] add information about how to compile a module

["anlauf at gmx dot de" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42607

Harald Anlauf <anlauf at gmx dot de> changed:

           What    |Removed                     |Added
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                 CC|                            |anlauf at gmx dot de

--- Comment #13 from Harald Anlauf <anlauf at gmx dot de> ---
Since Cray was mentioned, the Cray online documentation says:

[...]
The following files are produced by or accepted by the Cray Fortran compiler:
[...]

modulename.mod
            If the -em option is specified, the compiler writes a
            modulename.mod file for each module; modulename is created by
            taking the name of the module and, if necessary, converting it to
            uppercase. This file contains module information, including any
            contained module procedures.


I consider that an example of a reasonable documentation.

Gfortran generated module files (modulename.mod) are always lower case.
Gfortran creates a .mod file not only for -c, but also for -fsyntax-only,
and apparently always when it is presented a source file which contains
a module statement.  It should not be that difficult to put that into the
documentation.

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