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Date:      Tue, 7 Aug 2018 12:31:39 +0200
From:      =?UTF-8?B?VMSzbA==?= Coosemans <tijl@FreeBSD.org>
To:        Anton Shterenlikht <as@cmplx.uk>
Cc:        freebsd-fortran@freebsd.org
Subject:   Re: autotools & Fortran
Message-ID:  <20180807123139.1cdce2d3@kalimero.tijl.coosemans.org>
In-Reply-To: <201808061546.w76FkgbJ065837@jail0199.vps.exonetric.net>
References:  <201808061546.w76FkgbJ065837@jail0199.vps.exonetric.net>

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On Mon, 6 Aug 2018 15:46:42 GMT Anton Shterenlikht <as@cmplx.uk> wrote:
> Hello
> 
> I've several questions on using autotools
> in Fortran projects. Perhaps somebody can
> answer here or point to existing examples.
> 
> 1. I have something like this right now:
> 
> use, intrinsic :: iso_fortran_env
> integer, parameter :: fk = real32
> 
> What I want is to set fk to "real32", "real64" or "real128"
> via autotools, so that I can build with 3 different
> real kinds via a command line option.
> 
> Ideally I want to avoid preprocessing.
> 
> Is this feasible?

use, intrinsic :: iso_fortran_env
integer, parameter :: fk = @REAL_TYPE@

% mv filename filename.in

And in configure.ac:

AC_SUBST([REAL_TYPE],[real32])
AC_CONFIG_FILES([filename])



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