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1 <html lang="en">
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2 <head>
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3 <title>Calling FFTW from Legacy Fortran - FFTW 3.3.3</title>
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4 <meta http-equiv="Content-Type" content="text/html">
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5 <meta name="description" content="FFTW 3.3.3">
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7 <link title="Top" rel="start" href="index.html#Top">
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8 <link rel="prev" href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran" title="Calling FFTW from Modern Fortran">
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9 <link rel="next" href="Upgrading-from-FFTW-version-2.html#Upgrading-from-FFTW-version-2" title="Upgrading from FFTW version 2">
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10 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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11 <!--
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12 This manual is for FFTW
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13 (version 3.3.3, 25 November 2012).
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14
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15 Copyright (C) 2003 Matteo Frigo.
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16
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17 Copyright (C) 2003 Massachusetts Institute of Technology.
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18
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19 Permission is granted to make and distribute verbatim copies of
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20 this manual provided the copyright notice and this permission
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21 notice are preserved on all copies.
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22
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23 Permission is granted to copy and distribute modified versions of
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24 this manual under the conditions for verbatim copying, provided
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25 that the entire resulting derived work is distributed under the
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26 terms of a permission notice identical to this one.
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27
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28 Permission is granted to copy and distribute translations of this
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29 manual into another language, under the above conditions for
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30 modified versions, except that this permission notice may be
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31 stated in a translation approved by the Free Software Foundation.
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32 -->
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44 --></style>
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45 </head>
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46 <body>
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47 <div class="node">
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48 <a name="Calling-FFTW-from-Legacy-Fortran"></a>
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49 <p>
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50 Next: <a rel="next" accesskey="n" href="Upgrading-from-FFTW-version-2.html#Upgrading-from-FFTW-version-2">Upgrading from FFTW version 2</a>,
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51 Previous: <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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52 Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
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53 <hr>
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54 </div>
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55
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56 <h2 class="chapter">8 Calling FFTW from Legacy Fortran</h2>
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57
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58 <p><a name="index-Fortran-interface-577"></a>
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59 This chapter describes the interface to FFTW callable by Fortran code
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60 in older compilers not supporting the Fortran 2003 C interoperability
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61 features (see <a href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran">Calling FFTW from Modern Fortran</a>). This interface
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62 has the major disadvantage that it is not type-checked, so if you
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63 mistake the argument types or ordering then your program will not have
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64 any compiler errors, and will likely crash at runtime. So, greater
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65 care is needed. Also, technically interfacing older Fortran versions
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66 to C is nonstandard, but in practice we have found that the techniques
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67 used in this chapter have worked with all known Fortran compilers for
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68 many years.
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69
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70 <p>The legacy Fortran interface differs from the C interface only in the
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71 prefix (‘<samp><span class="samp">dfftw_</span></samp>’ instead of ‘<samp><span class="samp">fftw_</span></samp>’ in double precision) and
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72 a few other minor details. This Fortran interface is included in the
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73 FFTW libraries by default, unless a Fortran compiler isn't found on
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74 your system or <code>--disable-fortran</code> is included in the
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75 <code>configure</code> flags. We assume here that the reader is already
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76 familiar with the usage of FFTW in C, as described elsewhere in this
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77 manual.
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78
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79 <p>The MPI parallel interface to FFTW is <em>not</em> currently available
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80 to legacy Fortran.
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81
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82 <ul class="menu">
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83 <li><a accesskey="1" href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines">Fortran-interface routines</a>
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84 <li><a accesskey="2" href="FFTW-Constants-in-Fortran.html#FFTW-Constants-in-Fortran">FFTW Constants in Fortran</a>
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85 <li><a accesskey="3" href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran">FFTW Execution in Fortran</a>
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86 <li><a accesskey="4" href="Fortran-Examples.html#Fortran-Examples">Fortran Examples</a>
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87 <li><a accesskey="5" href="Wisdom-of-Fortran_003f.html#Wisdom-of-Fortran_003f">Wisdom of Fortran?</a>
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88 </ul>
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89
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90 <!-- -->
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91 </body></html>
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92
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