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cannam@167: <title>FFTW 3.3.8: Calling FFTW from Legacy Fortran</title>
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cannam@167: <a name="Calling-FFTW-from-Legacy-Fortran"></a>
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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> &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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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 (&lsquo;<samp>dfftw_</samp>&rsquo; instead of &lsquo;<samp>fftw_</samp>&rsquo; 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&rsquo;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">&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">
cannam@167: </td></tr>
cannam@167: <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">
cannam@167: </td></tr>
cannam@167: <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">
cannam@167: </td></tr>
cannam@167: <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">
cannam@167: </td></tr>
cannam@167: <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">
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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> &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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