autotools & Fortran

[Tijl Coosemans]

On Mon, 6 Aug 2018 15:46:42 GMT Anton Shterenlikht <as at 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])