cannam@127: Next: Upgrading from FFTW version 2, Previous: Calling FFTW from Modern Fortran, Up: Top [Contents][Index]
cannam@127:This chapter describes the interface to FFTW callable by Fortran code cannam@127: in older compilers not supporting the Fortran 2003 C interoperability cannam@127: features (see Calling FFTW from Modern Fortran). This interface cannam@127: has the major disadvantage that it is not type-checked, so if you cannam@127: mistake the argument types or ordering then your program will not have cannam@127: any compiler errors, and will likely crash at runtime. So, greater cannam@127: care is needed. Also, technically interfacing older Fortran versions cannam@127: to C is nonstandard, but in practice we have found that the techniques cannam@127: used in this chapter have worked with all known Fortran compilers for cannam@127: many years. cannam@127:
cannam@127:The legacy Fortran interface differs from the C interface only in the
cannam@127: prefix (‘dfftw_’ instead of ‘fftw_’ in double precision) and
cannam@127: a few other minor details. This Fortran interface is included in the
cannam@127: FFTW libraries by default, unless a Fortran compiler isn’t found on
cannam@127: your system or --disable-fortran is included in the
cannam@127: configure flags. We assume here that the reader is already
cannam@127: familiar with the usage of FFTW in C, as described elsewhere in this
cannam@127: manual.
cannam@127:
The MPI parallel interface to FFTW is not currently available cannam@127: to legacy Fortran. cannam@127:
cannam@127:| • Fortran-interface routines: | cannam@127: | |
| • FFTW Constants in Fortran: | cannam@127: | |
| • FFTW Execution in Fortran: | cannam@127: | |
| • Fortran Examples: | cannam@127: | |
| • Wisdom of Fortran?: | cannam@127: |
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