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Replace these with versions built using an older toolset (so as to avoid ABI compatibilities when linking on Ubuntu 14.04 for packaging purposes)
author Chris Cannam
date Fri, 07 Feb 2020 11:51:13 +0000
parents 37bf6b4a2645
children
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Chris@10 1 <html lang="en">
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Chris@10 3 <title>Calling FFTW from Legacy Fortran - FFTW 3.3.3</title>
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Chris@10 48 <a name="Calling-FFTW-from-Legacy-Fortran"></a>
Chris@10 49 <p>
Chris@10 50 Next:&nbsp;<a rel="next" accesskey="n" href="Upgrading-from-FFTW-version-2.html#Upgrading-from-FFTW-version-2">Upgrading from FFTW version 2</a>,
Chris@10 51 Previous:&nbsp;<a rel="previous" accesskey="p" href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran">Calling FFTW from Modern Fortran</a>,
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Chris@10 55
Chris@10 56 <h2 class="chapter">8 Calling FFTW from Legacy Fortran</h2>
Chris@10 57
Chris@10 58 <p><a name="index-Fortran-interface-577"></a>
Chris@10 59 This chapter describes the interface to FFTW callable by Fortran code
Chris@10 60 in older compilers not supporting the Fortran 2003 C interoperability
Chris@10 61 features (see <a href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran">Calling FFTW from Modern Fortran</a>). This interface
Chris@10 62 has the major disadvantage that it is not type-checked, so if you
Chris@10 63 mistake the argument types or ordering then your program will not have
Chris@10 64 any compiler errors, and will likely crash at runtime. So, greater
Chris@10 65 care is needed. Also, technically interfacing older Fortran versions
Chris@10 66 to C is nonstandard, but in practice we have found that the techniques
Chris@10 67 used in this chapter have worked with all known Fortran compilers for
Chris@10 68 many years.
Chris@10 69
Chris@10 70 <p>The legacy Fortran interface differs from the C interface only in the
Chris@10 71 prefix (&lsquo;<samp><span class="samp">dfftw_</span></samp>&rsquo; instead of &lsquo;<samp><span class="samp">fftw_</span></samp>&rsquo; in double precision) and
Chris@10 72 a few other minor details. This Fortran interface is included in the
Chris@10 73 FFTW libraries by default, unless a Fortran compiler isn't found on
Chris@10 74 your system or <code>--disable-fortran</code> is included in the
Chris@10 75 <code>configure</code> flags. We assume here that the reader is already
Chris@10 76 familiar with the usage of FFTW in C, as described elsewhere in this
Chris@10 77 manual.
Chris@10 78
Chris@10 79 <p>The MPI parallel interface to FFTW is <em>not</em> currently available
Chris@10 80 to legacy Fortran.
Chris@10 81
Chris@10 82 <ul class="menu">
Chris@10 83 <li><a accesskey="1" href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines">Fortran-interface routines</a>
Chris@10 84 <li><a accesskey="2" href="FFTW-Constants-in-Fortran.html#FFTW-Constants-in-Fortran">FFTW Constants in Fortran</a>
Chris@10 85 <li><a accesskey="3" href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran">FFTW Execution in Fortran</a>
Chris@10 86 <li><a accesskey="4" href="Fortran-Examples.html#Fortran-Examples">Fortran Examples</a>
Chris@10 87 <li><a accesskey="5" href="Wisdom-of-Fortran_003f.html#Wisdom-of-Fortran_003f">Wisdom of Fortran?</a>
Chris@10 88 </ul>
Chris@10 89
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Chris@10 92