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<title>GNU Scientific Library – Reference Manual: Linking programs with the library</title>
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<a name="Linking-programs-with-the-library"></a>
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<p>
Next: <a href="Linking-with-an-alternative-BLAS-library.html#Linking-with-an-alternative-BLAS-library" accesskey="n" rel="next">Linking with an alternative BLAS library</a>, Up: <a href="Compiling-and-Linking.html#Compiling-and-Linking" accesskey="u" rel="up">Compiling and Linking</a> [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Linking-programs-with-the-library-1"></a>
<h4 class="subsection">2.2.1 Linking programs with the library</h4>
<a name="index-compiling-programs_002c-library-paths"></a>
<a name="index-linking-with-GSL-libraries"></a>
<a name="index-libraries_002c-linking-with"></a>
<p>The library is installed as a single file, <samp>libgsl.a</samp>. A shared
version of the library <samp>libgsl.so</samp> is also installed on systems
that support shared libraries. The default location of these files is
<samp>/usr/local/lib</samp>. If this directory is not on the standard search
path of your linker you will also need to provide its location as a
command line flag.
</p>
<p>To link against the library you need to specify
both the main library and a supporting <small>CBLAS</small> library, which
provides standard basic linear algebra subroutines. A suitable
<small>CBLAS</small> implementation is provided in the library
<samp>libgslcblas.a</samp> if your system does not provide one. The following
example shows how to link an application with the library,
</p>
<div class="example">
<pre class="example">$ gcc -L/usr/local/lib example.o -lgsl -lgslcblas -lm
</pre></div>
<p>The default library path for <code>gcc</code> searches <samp>/usr/local/lib</samp>
automatically so the <code>-L</code> option can be omitted when GSL is
installed in its default location.
</p>
<p>The option <code>-lm</code> links with the system math library. On some
systems it is not needed.<a name="DOCF3" href="#FOOT3"><sup>3</sup></a>
</p>
<p>For a tutorial introduction to the GNU C Compiler and related programs,
see <a href="http://www.network-theory.co.uk/gcc/intro/"><cite>An Introduction to GCC</cite></a> (ISBN 0954161793).<a name="DOCF4" href="#FOOT4"><sup>4</sup></a>
</p>
<div class="footnote">
<hr>
<h4 class="footnotes-heading">Footnotes</h4>
<h3><a name="FOOT3" href="#DOCF3">(3)</a></h3>
<p>It is not needed on MacOS X.</p>
<h3><a name="FOOT4" href="#DOCF4">(4)</a></h3>
<p><a href="http://www.network-theory.co.uk/gcc/intro/">http://www.network-theory.co.uk/gcc/intro/</a></p>
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