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From:	Achim Gratz <Stromeko AT nexgo DOT de>
To:	cygwin AT cygwin DOT com
Subject:	Re: Setting up a proper modelling environment in Cygwin
References:	<CAOt=qgmQZ2a7u5ZwM3p7twFMc5F44sO9eLX1aOTtLZCO2Q1_1w AT mail DOT gmail DOT com>
	<90d505d5-11fc-418d-02e4-73dd423a92ce AT gmail DOT com>
Date:	Sat, 12 Sep 2020 11:29:57 +0200
In-Reply-To:	<90d505d5-11fc-418d-02e4-73dd423a92ce@gmail.com> (Marco Atzeri
	via Cygwin's message of "Fri, 11 Sep 2020 16:59:24 +0200")
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Marco Atzeri via Cygwin writes:
> On 11.09.2020 04:37, Lawrence Bernardo via Cygwin wrote:
> for what I am aware the problem is only present with
> fortran modules if you are using them.
> Now the current gfortran has
>
> $ zcat
> /usr/lib/gcc/x86_64-pc-cygwin/9.3.0/finclude/ieee_arithmetic.mod|head
> -n 1
> GFORTRAN module version '15' created from ieee_arithmetic.F90
>
> openmpi was built with last gcc so it is aligned
>
> $ zcat /usr/lib/mpi.mod |head -n 1
> GFORTRAN module version '15' created from mpi-ignore-tkr.F90

If these are dependent on the compiler version / module ABI version,
then they should be moved to some version dependent directory, then.  I
have no idea yet how to name that.  The Linux distributions I've looked
at have a very complicated folder structure that caters to the HPC folks
that want multiple parallel installed versions.

With gcc10 the gfortran package will provide "gfm15" and that number
will be incremented in lockstep with the Fortran module version so that
setup can figure out if things match.  In order for this to work any
packages delivering Fortran modules would need to have a manual require
on that.

> netcdf-fortran needs a rebuild
>
> $ zcat /usr/include/netcdf.mod | head -n 1
> GFORTRAN module version '14' created from netcdf4.f90

Certainly none of these files should live in /usr/include.

These seem to be the only two packages in the distribution that provide
Fortran modules, so the impact is currently limited.



Regards,
Achim.
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