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Current fftw source
author Chris Cannam
date Tue, 18 Oct 2016 13:40:26 +0100
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3 <!-- This manual is for FFTW
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72 <a name="Calling-FFTW-from-Legacy-Fortran"></a>
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74 <p>
75 Next: <a href="Upgrading-from-FFTW-version-2.html#Upgrading-from-FFTW-version-2" accesskey="n" rel="next">Upgrading from FFTW version 2</a>, Previous: <a href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran" accesskey="p" rel="prev">Calling FFTW from Modern Fortran</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
76 </div>
77 <hr>
78 <a name="Calling-FFTW-from-Legacy-Fortran-1"></a>
79 <h2 class="chapter">8 Calling FFTW from Legacy Fortran</h2>
80 <a name="index-Fortran-interface-3"></a>
81
82 <p>This chapter describes the interface to FFTW callable by Fortran code
83 in older compilers not supporting the Fortran 2003 C interoperability
84 features (see <a href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran">Calling FFTW from Modern Fortran</a>). This interface
85 has the major disadvantage that it is not type-checked, so if you
86 mistake the argument types or ordering then your program will not have
87 any compiler errors, and will likely crash at runtime. So, greater
88 care is needed. Also, technically interfacing older Fortran versions
89 to C is nonstandard, but in practice we have found that the techniques
90 used in this chapter have worked with all known Fortran compilers for
91 many years.
92 </p>
93 <p>The legacy Fortran interface differs from the C interface only in the
94 prefix (&lsquo;<samp>dfftw_</samp>&rsquo; instead of &lsquo;<samp>fftw_</samp>&rsquo; in double precision) and
95 a few other minor details. This Fortran interface is included in the
96 FFTW libraries by default, unless a Fortran compiler isn&rsquo;t found on
97 your system or <code>--disable-fortran</code> is included in the
98 <code>configure</code> flags. We assume here that the reader is already
99 familiar with the usage of FFTW in C, as described elsewhere in this
100 manual.
101 </p>
102 <p>The MPI parallel interface to FFTW is <em>not</em> currently available
103 to legacy Fortran.
104 </p>
105 <table class="menu" border="0" cellspacing="0">
106 <tr><td align="left" valign="top">&bull; <a href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines" accesskey="1">Fortran-interface routines</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
107 </td></tr>
108 <tr><td align="left" valign="top">&bull; <a href="FFTW-Constants-in-Fortran.html#FFTW-Constants-in-Fortran" accesskey="2">FFTW Constants in Fortran</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
109 </td></tr>
110 <tr><td align="left" valign="top">&bull; <a href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran" accesskey="3">FFTW Execution in Fortran</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
111 </td></tr>
112 <tr><td align="left" valign="top">&bull; <a href="Fortran-Examples.html#Fortran-Examples" accesskey="4">Fortran Examples</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
113 </td></tr>
114 <tr><td align="left" valign="top">&bull; <a href="Wisdom-of-Fortran_003f.html#Wisdom-of-Fortran_003f" accesskey="5">Wisdom of Fortran?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
115 </td></tr>
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120 <p>
121 Next: <a href="Upgrading-from-FFTW-version-2.html#Upgrading-from-FFTW-version-2" accesskey="n" rel="next">Upgrading from FFTW version 2</a>, Previous: <a href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran" accesskey="p" rel="prev">Calling FFTW from Modern Fortran</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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