Question regarding compiling modules

Question regarding compiling modules

[Ken Woolridge]

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A little background: I have Intel's Fortran90 compiler which I used for years.  However, I recently had to reinstall it and found that the key
was no longer valid.  Intel did not have the decency to return my emails so I looked for another Fortran90 compiler.

I found something called FTN95 (British, I believe) but their linker couldn't find any assembler routines even though they were placed
in the library.

I am in the process of testing gfortran.  However, when I compile a module called MOD_WIN_APIS containing interfaces to Microsoft
API functions I get the error:

   Error: Derived type '{whatever}' at (1) is being used before it is defined

I have defined these types in another module named MOD_TYPES which is compiled prior to MOD_WIN_APIS.
MOD_WIN_APIS uses MOD_TYPES (with the statement "USE MOD_TYPES") prior to any interfaces being defined.

Why am I getting this error when the types are defined???

Thank you,
Ken

Re: Question regarding compiling modules

[Steve Kargl]

On Wed, Feb 28, 2024 at 10:42:36PM +0000, Ken Woolridge wrote:
> A little background: I have Intel's Fortran90 compiler which
> I used for years.  However, I recently had to reinstall it
> and found that the key was no longer valid.  Intel did not
> have the decency to return my emails so I looked for another
> Fortran90 compiler.

Intel's OneApi is available for download and use without 
a license key.  This isn't the forum to discuss how to
go about getting a useable OneApi.

> I am in the process of testing gfortran.  However, when I
> compile a module called MOD_WIN_APIS containing interfaces
> to Microsoft API functions I get the error:
> 
>    Error: Derived type '{whatever}' at (1) is being used before it is defined
> 
> I have defined these types in another module named MOD_TYPES
> which is compiled prior to MOD_WIN_APIS.   MOD_WIN_APIS uses MOD_TYPES
> (with the statement "USE MOD_TYPES") prior to any interfaces being defined.
> 
> Why am I getting this error when the types are defined???

Stab in the dark.  mod_types.mod is another directory.  Try
adding the "-I. -I${path_to_mod_types.mod}" to your command line.

-- 
Steve