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<li>Building Android binary</li>
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<div class="section" id="building-android-binary">
<h1>Building Android binary<a class="headerlink" href="#building-android-binary" title="Permalink to this headline"></a></h1>
<p>In this article, we briefly describe how to build Android binary using
<a class="reference external" href="http://developer.android.com/tools/sdk/ndk/index.html">Android NDK</a>
cross-compiler on Debian Linux.</p>
<p>We offer <tt class="docutils literal"><span class="pre">android-config</span></tt> and <tt class="docutils literal"><span class="pre">android-make</span></tt> scripts to make the
build easier. To make these script work, NDK toolchain must be
installed in the following way. First, let us introduce
<tt class="docutils literal"><span class="pre">ANDROID_HOME</span></tt> environment variable. We need to install toolchain
under <tt class="docutils literal"><span class="pre">$ANDROID_HOME/toolchain</span></tt>. An user can freely choose the path
for <tt class="docutils literal"><span class="pre">ANDROID_HOME</span></tt>. For example, to install toolchain under
<tt class="docutils literal"><span class="pre">$ANDROID_HOME/toolchain</span></tt>, do this in the the directory where NDK is
unpacked:</p>
<div class="highlight-c"><div class="highlight"><pre>$ build/tools/make-standalone-toolchain.sh \
--install-dir=$ANDROID_HOME/toolchain \
--toolchain=arm-linux-androideabi-4.8 \
--llvm-version=3.4
</pre></div>
</div>
<p>The additional flag <tt class="docutils literal"><span class="pre">--system=linux-x86_64</span></tt> may be required if you
are using x86_64 system.</p>
<p>The platform level is not important here because we don&#8217;t use Android
specific C/C++ API.</p>
<p>The dependent libraries, such as OpenSSL and libevent should be built
with the toolchain and installed under <tt class="docutils literal"><span class="pre">$ANDROID_HOME/usr/local</span></tt>.
We recommend to build these libraries as static library to make the
deployment easier. libxml2 support is currently disabled.</p>
<p>We use zlib which comes with Android NDK, so we don&#8217;t have to build it
by ourselves.</p>
<p>If SPDY support is required for nghttpx and h2load, build and install
spdylay as well.</p>
<p>Before running <tt class="docutils literal"><span class="pre">android-config</span></tt> and <tt class="docutils literal"><span class="pre">android-make</span></tt>,
<tt class="docutils literal"><span class="pre">ANDROID_HOME</span></tt> environment variable must be set to point to the
correct path. Also add <tt class="docutils literal"><span class="pre">$ANDROID_HOME/toolchain/bin</span></tt> to <tt class="docutils literal"><span class="pre">PATH</span></tt>:</p>
<div class="highlight-c"><div class="highlight"><pre>$ export PATH=$PATH:$ANDROID_HOME/toolchain/bin
</pre></div>
</div>
<p>To configure OpenSSL, use the following script:</p>
<div class="highlight-c"><div class="highlight"><pre>#!/bin/sh
if [ -z &quot;$ANDROID_HOME&quot; ]; then
echo &#39;No $ANDROID_HOME specified.&#39;
exit 1
fi
PREFIX=$ANDROID_HOME/usr/local
TOOLCHAIN=$ANDROID_HOME/toolchain
PATH=$TOOLCHAIN/bin:$PATH
export CROSS_COMPILE=$TOOLCHAIN/bin/arm-linux-androideabi-
./Configure --prefix=$PREFIX android
</pre></div>
</div>
<p>And run <tt class="docutils literal"><span class="pre">make</span> <span class="pre">install</span></tt> to build and install.</p>
<p>To configure libevent, use the following script:</p>
<div class="highlight-c"><div class="highlight"><pre>#!/bin/sh
if [ -z &quot;$ANDROID_HOME&quot; ]; then
echo &#39;No $ANDROID_HOME specified.&#39;
exit 1
fi
PREFIX=$ANDROID_HOME/usr/local
TOOLCHAIN=$ANDROID_HOME/toolchain
PATH=$TOOLCHAIN/bin:$PATH
./configure \
--host=arm-linux-androideabi \
--build=`dpkg-architecture -qDEB_BUILD_GNU_TYPE` \
--prefix=$PREFIX \
--disable-shared \
--enable-static \
CPPFLAGS=-I$PREFIX/include \
LDFLAGS=-L$PREFIX/lib
</pre></div>
</div>
<p>And run <tt class="docutils literal"><span class="pre">make</span> <span class="pre">install</span></tt> to build and install.</p>
<p>To configure spdylay, use the following script:</p>
<div class="highlight-c"><div class="highlight"><pre>if [ -z &quot;$ANDROID_HOME&quot; ]; then
echo &#39;No $ANDROID_HOME specified.&#39;
exit 1
fi
PREFIX=$ANDROID_HOME/usr/local
TOOLCHAIN=$ANDROID_HOME/toolchain
PATH=$TOOLCHAIN/bin:$PATH
./configure \
--disable-shared \
--host=arm-linux-androideabi \
--build=`dpkg-architecture -qDEB_BUILD_GNU_TYPE` \
--prefix=$PREFIX \
--without-libxml2 \
--disable-src \
--disable-examples \
CPPFLAGS=&quot;-I$PREFIX/include&quot; \
PKG_CONFIG_LIBDIR=&quot;$PREFIX/lib/pkgconfig&quot; \
LDFLAGS=&quot;-L$PREFIX/lib&quot;
</pre></div>
</div>
<p>And run <tt class="docutils literal"><span class="pre">make</span> <span class="pre">install</span></tt> to build and install. After spdylay
installation, edit $ANDROID_HOME/usr/local/lib/pkgconfig/libspdylay.pc
and remove the following line:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="n">Requires</span><span class="p">.</span><span class="n">private</span><span class="o">:</span> <span class="n">zlib</span>
</pre></div>
</div>
<p>After prerequisite libraries are prepared, run <tt class="docutils literal"><span class="pre">android-config</span></tt> and
then <tt class="docutils literal"><span class="pre">android-make</span></tt> to compile nghttp2 source files.</p>
<p>If all went well, application binaries, such as nghttpx, are created
under src directory. Strip debugging information from the binary
using the following command:</p>
<div class="highlight-c"><div class="highlight"><pre>$ arm-linux-androideabi-strip src/nghttpx
</pre></div>
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