Chris@10: #! /bin/sh
Chris@10: 
Chris@10: # Script to generate Fortran 2003 interface declarations for FFTW's MPI
Chris@10: # interface from the fftw3-mpi.h header file.
Chris@10: 
Chris@10: # This is designed so that the Fortran caller can do:
Chris@10: #   use, intrinsic :: iso_c_binding
Chris@10: #   implicit none
Chris@10: #   include 'fftw3-mpi.f03'
Chris@10: # and then call the C FFTW MPI functions directly, with type checking.
Chris@10: #
Chris@10: # One caveat: because there is no standard way to conver MPI_Comm objects
Chris@10: # from Fortran (= integer) to C (= opaque type), the Fortran interface
Chris@10: # technically calls C wrapper functions (also auto-generated) which
Chris@10: # call MPI_Comm_f2c to convert the communicators as needed.
Chris@10: 
Chris@10: echo "! Generated automatically.  DO NOT EDIT!"
Chris@10: echo
Chris@10: 
Chris@10: echo "  include 'fftw3.f03'"
Chris@10: echo
Chris@10: 
Chris@10: # Extract constants
Chris@10: perl -pe 's/#define +([A-Z0-9_]+) +\(([+-]?[0-9]+)U?\)/\n  integer\(C_INTPTR_T\), parameter :: \1 = \2\n/g' < fftw3-mpi.h | grep 'integer(C_INTPTR_T)'
Chris@10: perl -pe 'if (/#define +([A-Z0-9_]+) +\(([0-9]+)U? *<< *([0-9]+)\)/) { print "\n  integer\(C_INT\), parameter :: $1 = ",$2 << $3,"\n"; }' < fftw3-mpi.h | grep 'integer(C_INT)'
Chris@10: 
Chris@10: # Extract function declarations
Chris@10: for p in $*; do
Chris@10:     if test "$p" = "d"; then p=""; fi
Chris@10: 
Chris@10:     echo
Chris@10:     cat <<EOF
Chris@10:   type, bind(C) :: fftw${p}_mpi_ddim
Chris@10:      integer(C_INTPTR_T) n, ib, ob
Chris@10:   end type fftw${p}_mpi_ddim
Chris@10: EOF
Chris@10: 
Chris@10:     echo
Chris@10:     echo "  interface"
Chris@10:     grep -v 'mpi.h' fftw3-mpi.h | gcc -D__GNUC__=5 -D__i386__ -E - |grep "fftw${p}_mpi_init" |tr ';' '\n' | perl ../api/genf03.pl
Chris@10:     echo "  end interface"
Chris@10: 
Chris@10: done