[patch] Document __STDCPP_WANT_MATH_SPEC_FUNCS__ macro

[Jonathan Wakely]

Committed to trunk.


commit 6da32ab58d56e2909ed39e5fc2170717ad26e895
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Tue Feb 23 20:01:35 2016 +0000

    Document __STDCPP_WANT_MATH_SPEC_FUNCS__ macro
    
    	* doc/xml/manual/using.xml: Document __STDCPP_WANT_MATH_SPEC_FUNCS__.
    	* doc/html/*: Regenerate.

diff --git a/libstdc++-v3/doc/html/manual/using_macros.html b/libstdc++-v3/doc/html/manual/using_macros.html
index 6b1fc1e..2ef05af 100644
--- a/libstdc++-v3/doc/html/manual/using_macros.html
+++ b/libstdc++-v3/doc/html/manual/using_macros.html
@@ -89,4 +89,6 @@
       </p></dd><dt><span class="term"><code class="code">_GLIBCXX_PROFILE</code></span></dt><dd><p>Undefined by default. When defined, compiles user code
 	using the <a class="link" href="profile_mode.html" title="Chapter??19.??Profile Mode">profile
 	mode</a>.
+      </p></dd><dt><span class="term"><code class="code">__STDCPP_WANT_MATH_SPEC_FUNCS__</code></span></dt><dd><p>Undefined by default. When defined to a non-zero integer constant,
+	enables support for ISO/IEC 29124 Special Math Functions.
       </p></dd></dl></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="using_headers.html">Prev</a>??</td><td width="20%" align="center"><a accesskey="u" href="using.html">Up</a></td><td width="40%" align="right">??<a accesskey="n" href="using_dual_abi.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Headers??</td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top">??Dual ABI</td></tr></table></div></body></html>
\ No newline at end of file
diff --git a/libstdc++-v3/doc/xml/manual/using.xml b/libstdc++-v3/doc/xml/manual/using.xml
index 96ae686..6e022d5 100644
--- a/libstdc++-v3/doc/xml/manual/using.xml
+++ b/libstdc++-v3/doc/xml/manual/using.xml
@@ -955,6 +955,13 @@ g++ -Winvalid-pch -I. -include stdc++.h -H -g -O2 hello.cc -o test.exe
 	mode</link>.
       </para>
     </listitem></varlistentry>
+
+    <varlistentry><term><code>__STDCPP_WANT_MATH_SPEC_FUNCS__</code></term>
+    <listitem>
+      <para>Undefined by default. When defined to a non-zero integer constant,
+	enables support for ISO/IEC 29124 Special Math Functions.
+      </para>
+    </listitem></varlistentry>
     </variablelist>
 
   </section>