cannam@167: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> cannam@167: <html> cannam@167: <!-- This manual is for FFTW cannam@167: (version 3.3.8, 24 May 2018). cannam@167: cannam@167: Copyright (C) 2003 Matteo Frigo. cannam@167: cannam@167: Copyright (C) 2003 Massachusetts Institute of Technology. cannam@167: cannam@167: Permission is granted to make and distribute verbatim copies of this cannam@167: manual provided the copyright notice and this permission notice are cannam@167: preserved on all copies. cannam@167: cannam@167: Permission is granted to copy and distribute modified versions of this cannam@167: manual under the conditions for verbatim copying, provided that the cannam@167: entire resulting derived work is distributed under the terms of a cannam@167: permission notice identical to this one. cannam@167: cannam@167: Permission is granted to copy and distribute translations of this manual cannam@167: into another language, under the above conditions for modified versions, cannam@167: except that this permission notice may be stated in a translation cannam@167: approved by the Free Software Foundation. --> cannam@167: <!-- Created by GNU Texinfo 6.3, http://www.gnu.org/software/texinfo/ --> cannam@167: <head> cannam@167: <title>FFTW 3.3.8: Calling FFTW from Legacy Fortran</title> cannam@167: cannam@167: <meta name="description" content="FFTW 3.3.8: Calling FFTW from Legacy Fortran"> cannam@167: <meta name="keywords" content="FFTW 3.3.8: Calling FFTW from Legacy Fortran"> cannam@167: <meta name="resource-type" content="document"> cannam@167: <meta name="distribution" content="global"> cannam@167: <meta name="Generator" content="makeinfo"> cannam@167: <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> cannam@167: <link href="index.html#Top" rel="start" title="Top"> cannam@167: <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> cannam@167: <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> cannam@167: <link href="index.html#Top" rel="up" title="Top"> cannam@167: <link href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines" rel="next" title="Fortran-interface routines"> cannam@167: <link href="Defining-an-FFTW-module.html#Defining-an-FFTW-module" rel="prev" title="Defining an FFTW module"> cannam@167: <style type="text/css"> cannam@167: <!-- cannam@167: a.summary-letter {text-decoration: none} cannam@167: blockquote.indentedblock {margin-right: 0em} cannam@167: blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} cannam@167: blockquote.smallquotation {font-size: smaller} cannam@167: div.display {margin-left: 3.2em} cannam@167: div.example {margin-left: 3.2em} cannam@167: div.lisp {margin-left: 3.2em} cannam@167: div.smalldisplay {margin-left: 3.2em} cannam@167: div.smallexample {margin-left: 3.2em} cannam@167: div.smalllisp {margin-left: 3.2em} cannam@167: kbd {font-style: oblique} cannam@167: pre.display {font-family: inherit} cannam@167: pre.format {font-family: inherit} cannam@167: pre.menu-comment {font-family: serif} cannam@167: pre.menu-preformatted {font-family: serif} cannam@167: pre.smalldisplay {font-family: inherit; font-size: smaller} cannam@167: pre.smallexample {font-size: smaller} cannam@167: pre.smallformat {font-family: inherit; font-size: smaller} cannam@167: pre.smalllisp {font-size: smaller} cannam@167: span.nolinebreak {white-space: nowrap} cannam@167: span.roman {font-family: initial; font-weight: normal} cannam@167: span.sansserif {font-family: sans-serif; font-weight: normal} cannam@167: ul.no-bullet {list-style: none} cannam@167: --> cannam@167: </style> cannam@167: cannam@167: cannam@167: </head> cannam@167: cannam@167: <body lang="en"> cannam@167: <a name="Calling-FFTW-from-Legacy-Fortran"></a> cannam@167: <div class="header"> cannam@167: <p> cannam@167: 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> [<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> cannam@167: </div> cannam@167: <hr> cannam@167: <a name="Calling-FFTW-from-Legacy-Fortran-1"></a> cannam@167: <h2 class="chapter">8 Calling FFTW from Legacy Fortran</h2> cannam@167: <a name="index-Fortran-interface-3"></a> cannam@167: cannam@167: <p>This chapter describes the interface to FFTW callable by Fortran code cannam@167: in older compilers not supporting the Fortran 2003 C interoperability cannam@167: features (see <a href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran">Calling FFTW from Modern Fortran</a>). This interface cannam@167: has the major disadvantage that it is not type-checked, so if you cannam@167: mistake the argument types or ordering then your program will not have cannam@167: any compiler errors, and will likely crash at runtime. So, greater cannam@167: care is needed. Also, technically interfacing older Fortran versions cannam@167: to C is nonstandard, but in practice we have found that the techniques cannam@167: used in this chapter have worked with all known Fortran compilers for cannam@167: many years. cannam@167: </p> cannam@167: <p>The legacy Fortran interface differs from the C interface only in the cannam@167: prefix (‘<samp>dfftw_</samp>’ instead of ‘<samp>fftw_</samp>’ in double precision) and cannam@167: a few other minor details. This Fortran interface is included in the cannam@167: FFTW libraries by default, unless a Fortran compiler isn’t found on cannam@167: your system or <code>--disable-fortran</code> is included in the cannam@167: <code>configure</code> flags. We assume here that the reader is already cannam@167: familiar with the usage of FFTW in C, as described elsewhere in this cannam@167: manual. cannam@167: </p> cannam@167: <p>The MPI parallel interface to FFTW is <em>not</em> currently available cannam@167: to legacy Fortran. cannam@167: </p> cannam@167: <table class="menu" border="0" cellspacing="0"> cannam@167: <tr><td align="left" valign="top">• <a href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines" accesskey="1">Fortran-interface routines</a>:</td><td> </td><td align="left" valign="top"> cannam@167: </td></tr> cannam@167: <tr><td align="left" valign="top">• <a href="FFTW-Constants-in-Fortran.html#FFTW-Constants-in-Fortran" accesskey="2">FFTW Constants in Fortran</a>:</td><td> </td><td align="left" valign="top"> cannam@167: </td></tr> cannam@167: <tr><td align="left" valign="top">• <a href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran" accesskey="3">FFTW Execution in Fortran</a>:</td><td> </td><td align="left" valign="top"> cannam@167: </td></tr> cannam@167: <tr><td align="left" valign="top">• <a href="Fortran-Examples.html#Fortran-Examples" accesskey="4">Fortran Examples</a>:</td><td> </td><td align="left" valign="top"> cannam@167: </td></tr> cannam@167: <tr><td align="left" valign="top">• <a href="Wisdom-of-Fortran_003f.html#Wisdom-of-Fortran_003f" accesskey="5">Wisdom of Fortran?</a>:</td><td> </td><td align="left" valign="top"> cannam@167: </td></tr> cannam@167: </table> cannam@167: cannam@167: <hr> cannam@167: <div class="header"> cannam@167: <p> cannam@167: 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> [<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> cannam@167: </div> cannam@167: cannam@167: cannam@167: cannam@167: </body> cannam@167: </html>