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<html>
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<!-- This manual is for FFTW
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(version 3.3.10, 10 December 2020).
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Copyright (C) 2003 Matteo Frigo.
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Copyright (C) 2003 Massachusetts Institute of Technology.
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Permission is granted to make and distribute verbatim copies of this
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manual provided the copyright notice and this permission notice are
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preserved on all copies.
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Permission is granted to copy and distribute modified versions of this
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manual under the conditions for verbatim copying, provided that the
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entire resulting derived work is distributed under the terms of a
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permission notice identical to this one.
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Permission is granted to copy and distribute translations of this manual
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into another language, under the above conditions for modified versions,
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except that this permission notice may be stated in a translation
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approved by the Free Software Foundation. -->
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<title>Installation on Unix (FFTW 3.3.10)</title>
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<span id="Installation-on-Unix"></span><div class="header">
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<p>
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Next: <a href="Installation-on-non_002dUnix-systems.html" accesskey="n" rel="next">Installation on non-Unix systems</a>, Previous: <a href="Installation-and-Customization.html" accesskey="p" rel="prev">Installation and Customization</a>, Up: <a href="Installation-and-Customization.html" accesskey="u" rel="up">Installation and Customization</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<span id="Installation-on-Unix-1"></span><h3 class="section">10.1 Installation on Unix</h3>
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<p>FFTW comes with a <code>configure</code> program in the GNU style.
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Installation can be as simple as:
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<span id="index-configure-2"></span>
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</p>
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<div class="example">
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<pre class="example">./configure
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make
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make install
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</pre></div>
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<p>This will build the uniprocessor complex and real transform libraries
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along with the test programs. (We recommend that you use GNU
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<code>make</code> if it is available; on some systems it is called
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<code>gmake</code>.) The “<code>make install</code>” command installs the fftw
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and rfftw libraries in standard places, and typically requires root
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privileges (unless you specify a different install directory with the
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<code>--prefix</code> flag to <code>configure</code>). You can also type
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“<code>make check</code>” to put the FFTW test programs through their paces.
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If you have problems during configuration or compilation, you may want
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to run “<code>make distclean</code>” before trying again; this ensures that
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you don’t have any stale files left over from previous compilation
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attempts.
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</p>
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<p>The <code>configure</code> script chooses the <code>gcc</code> compiler by default,
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if it is available; you can select some other compiler with:
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</p><div class="example">
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<pre class="example">./configure CC="<span class="roman"><i><the name of your C compiler></i></span>"
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</pre></div>
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<p>The <code>configure</code> script knows good <code>CFLAGS</code> (C compiler flags)
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<span id="index-compiler-flags"></span>
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for a few systems. If your system is not known, the <code>configure</code>
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script will print out a warning. In this case, you should re-configure
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FFTW with the command
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</p><div class="example">
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<pre class="example">./configure CFLAGS="<span class="roman"><i><write your CFLAGS here></i></span>"
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</pre></div>
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<p>and then compile as usual. If you do find an optimal set of
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<code>CFLAGS</code> for your system, please let us know what they are (along
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with the output of <code>config.guess</code>) so that we can include them in
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future releases.
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</p>
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<p><code>configure</code> supports all the standard flags defined by the GNU
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Coding Standards; see the <code>INSTALL</code> file in FFTW or
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<a href="http://www.gnu.org/prep/standards/html_node/index.html">the GNU web page</a>.
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Note especially <code>--help</code> to list all flags and
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<code>--enable-shared</code> to create shared, rather than static, libraries.
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<code>configure</code> also accepts a few FFTW-specific flags, particularly:
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</p>
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<ul>
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<li> <span id="index-precision-9"></span>
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<code>--enable-float</code>: Produces a single-precision version of FFTW
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(<code>float</code>) instead of the default double-precision (<code>double</code>).
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See <a href="Precision.html">Precision</a>.
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</li><li> <span id="index-precision-10"></span>
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<code>--enable-long-double</code>: Produces a long-double precision version of
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FFTW (<code>long double</code>) instead of the default double-precision
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(<code>double</code>). The <code>configure</code> script will halt with an error
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message if <code>long double</code> is the same size as <code>double</code> on your
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machine/compiler. See <a href="Precision.html">Precision</a>.
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</li><li> <span id="index-precision-11"></span>
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<code>--enable-quad-precision</code>: Produces a quadruple-precision version
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of FFTW using the nonstandard <code>__float128</code> type provided by
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<code>gcc</code> 4.6 or later on x86, x86-64, and Itanium architectures,
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instead of the default double-precision (<code>double</code>). The
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<code>configure</code> script will halt with an error message if the
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compiler is not <code>gcc</code> version 4.6 or later or if <code>gcc</code>’s
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<code>libquadmath</code> library is not installed. See <a href="Precision.html">Precision</a>.
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</li><li> <span id="index-threads-3"></span>
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<code>--enable-threads</code>: Enables compilation and installation of the
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FFTW threads library (see <a href="Multi_002dthreaded-FFTW.html">Multi-threaded FFTW</a>), which provides a
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simple interface to parallel transforms for SMP systems. By default,
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the threads routines are not compiled.
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</li><li> <code>--enable-openmp</code>: Like <code>--enable-threads</code>, but using OpenMP
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compiler directives in order to induce parallelism rather than
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spawning its own threads directly, and installing an ‘<samp>fftw3_omp</samp>’ library
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rather than an ‘<samp>fftw3_threads</samp>’ library (see <a href="Multi_002dthreaded-FFTW.html">Multi-threaded FFTW</a>). You can use both <code>--enable-openmp</code> and <code>--enable-threads</code>
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since they compile/install libraries with different names. By default,
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the OpenMP routines are not compiled.
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</li><li> <code>--with-combined-threads</code>: By default, if <code>--enable-threads</code>
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is used, the threads support is compiled into a separate library that
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must be linked in addition to the main FFTW library. This is so that
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users of the serial library do not need to link the system threads
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libraries. If <code>--with-combined-threads</code> is specified, however,
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then no separate threads library is created, and threads are included
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in the main FFTW library. This is mainly useful under Windows, where
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no system threads library is required and inter-library dependencies
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are problematic.
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</li><li> <span id="index-MPI-1"></span>
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<code>--enable-mpi</code>: Enables compilation and installation of the FFTW
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MPI library (see <a href="Distributed_002dmemory-FFTW-with-MPI.html">Distributed-memory FFTW with MPI</a>), which provides
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parallel transforms for distributed-memory systems with MPI. (By
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default, the MPI routines are not compiled.) See <a href="FFTW-MPI-Installation.html">FFTW MPI Installation</a>.
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</li><li> <span id="index-Fortran_002dcallable-wrappers"></span>
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<code>--disable-fortran</code>: Disables inclusion of legacy-Fortran
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wrapper routines (see <a href="Calling-FFTW-from-Legacy-Fortran.html">Calling FFTW from Legacy Fortran</a>) in the standard
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FFTW libraries. These wrapper routines increase the library size by
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only a negligible amount, so they are included by default as long as
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the <code>configure</code> script finds a Fortran compiler on your system.
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(To specify a particular Fortran compiler <i>foo</i>, pass
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<code>F77=</code><i>foo</i> to <code>configure</code>.)
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</li><li> <code>--with-g77-wrappers</code>: By default, when Fortran wrappers are
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included, the wrappers employ the linking conventions of the Fortran
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compiler detected by the <code>configure</code> script. If this compiler is
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GNU <code>g77</code>, however, then <em>two</em> versions of the wrappers are
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included: one with <code>g77</code>’s idiosyncratic convention of appending
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two underscores to identifiers, and one with the more common
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convention of appending only a single underscore. This way, the same
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FFTW library will work with both <code>g77</code> and other Fortran
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compilers, such as GNU <code>gfortran</code>. However, the converse is not
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true: if you configure with a different compiler, then the
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<code>g77</code>-compatible wrappers are not included. By specifying
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<code>--with-g77-wrappers</code>, the <code>g77</code>-compatible wrappers are
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included in addition to wrappers for whatever Fortran compiler
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<code>configure</code> finds.
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<span id="index-g77"></span>
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</li><li> <code>--with-slow-timer</code>: Disables the use of hardware cycle counters,
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and falls back on <code>gettimeofday</code> or <code>clock</code>. This greatly
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worsens performance, and should generally not be used (unless you don’t
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have a cycle counter but still really want an optimized plan regardless
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of the time). See <a href="Cycle-Counters.html">Cycle Counters</a>.
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</li><li> <code>--enable-sse</code> (single precision),
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<code>--enable-sse2</code> (single, double),
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<code>--enable-avx</code> (single, double),
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<code>--enable-avx2</code> (single, double),
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<code>--enable-avx512</code> (single, double),
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<code>--enable-avx-128-fma</code>,
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<code>--enable-kcvi</code> (single),
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<code>--enable-altivec</code> (single),
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<code>--enable-vsx</code> (single, double),
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<code>--enable-neon</code> (single, double on aarch64),
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<code>--enable-generic-simd128</code>,
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and
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<code>--enable-generic-simd256</code>:
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<p>Enable various SIMD instruction sets. You need compiler that supports
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the given SIMD extensions, but FFTW will try to detect at runtime
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whether the CPU supports these extensions. That is, you can compile
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with<code>--enable-avx</code> and the code will still run on a CPU without AVX
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support.
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</p>
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<ul class="no-bullet">
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<li>- These options require a compiler supporting SIMD extensions, and
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compiler support is always a bit flaky: see the FFTW FAQ for a list of
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compiler versions that have problems compiling FFTW.
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</li><li>- Because of the large variety of ARM processors and ABIs, FFTW
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does not attempt to guess the correct <code>gcc</code> flags for generating
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NEON code. In general, you will have to provide them on the command line.
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This command line is known to have worked at least once:
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<div class="example">
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<pre class="example">./configure --with-slow-timer --host=arm-linux-gnueabi \
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--enable-single --enable-neon \
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"CC=arm-linux-gnueabi-gcc -march=armv7-a -mfloat-abi=softfp"
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</pre></div>
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</li></ul>
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</li></ul>
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<span id="index-compiler-2"></span>
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<p>To force <code>configure</code> to use a particular C compiler <i>foo</i>
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(instead of the default, usually <code>gcc</code>), pass <code>CC=</code><i>foo</i> to the
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<code>configure</code> script; you may also need to set the flags via the variable
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<code>CFLAGS</code> as described above.
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<span id="index-compiler-flags-1"></span>
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Installation-on-non_002dUnix-systems.html" accesskey="n" rel="next">Installation on non-Unix systems</a>, Previous: <a href="Installation-and-Customization.html" accesskey="p" rel="prev">Installation and Customization</a>, Up: <a href="Installation-and-Customization.html" accesskey="u" rel="up">Installation and Customization</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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