74 lines
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74 lines
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<div class="titlepage"><div><div><h3 class="title">
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<a name="math_toolkit.float128.exp_function"></a><a class="link" href="exp_function.html" title="Exponential function">Exponential function</a>
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</h3></div></div></div>
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<p>
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There was a bug when using any quadmath <code class="computeroutput"><span class="identifier">expq</span></code>
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function on GCC : <a href="http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60349" target="_top">GCC
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bug #60349</a> caused by <a href="http://sourceforge.net/p/mingw-w64/bugs/368/" target="_top">mingw-64
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bug #368</a>.
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</p>
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<p>
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To work round this defect, an alternative implementation of 128-bit exp was
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temporarily provided by <code class="computeroutput"><span class="identifier">boost</span><span class="special">/</span><span class="identifier">cstdfloat</span><span class="special">.</span><span class="identifier">hpp</span></code>.
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</p>
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The mingw bug was fixed at 2014-03-12 and GCC 6.1.1 now works as expected.
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<th align="left">Tip</th>
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It is essential to <span class="bold"><strong>link</strong></span> to the quadmath
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library, for example, in a b2/bjam file: <code class="computeroutput"><span class="special"><</span><span class="identifier">linkflags</span><span class="special">>-</span><span class="identifier">lquadmath</span></code>
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<td align="right"><div class="copyright-footer">Copyright © 2006-2019 Nikhar
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Agrawal, Anton Bikineev, Paul A. Bristow, Marco Guazzone, Christopher Kormanyos,
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Hubert Holin, Bruno Lalande, John Maddock, Jeremy Murphy, Matthew Pulver, Johan
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Råde, Gautam Sewani, Benjamin Sobotta, Nicholas Thompson, Thijs van den Berg,
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Daryle Walker and Xiaogang Zhang<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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