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From: Lynn McGuire <lynnmcguire5@gmail.com>
Newsgroups: comp.lang.fortran
Subject: Re: in gfortran, is it faster compile times with *.mod files ?
Date: Mon, 11 Nov 2024 17:09:32 -0600
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On 11/11/2024 4:01 PM, Thomas Koenig wrote:
> Lynn McGuire <lynnmcguire5@gmail.com> schrieb:
>> In gfortran, is it faster compile times with *.mod files ?  Or is it
>> just as fast compiling to include the module interface information in
>> each subroutine / function file ?
> 
> I haven't benchmarked this, but I think likely that there would only
> be a small difference.  Usually, the front end only takes a small part of
> compilation time (but there are pathological cases).
> 
> In general, modules are better because of automatic checking.
> If you want to avoid recompilation cascades, submodules (where
> you can separate the definition from the implementation) might
> be worth looking into.
> 
>> Is there any chance that gfortran will automatically generate and use
>> module files in the future like IVF ?
> 
> Not sure what you're asking for.  Can you give an example?

1. you compile abc.f in IVF
2. IVF automagically creates an abc__genmod.f90 file in your release 
subdirectory with the subroutine / function module interface in it

Thanks,
Lynn