docs/html/ndk/guides/x86-64.jd

page.title=Support for 64-bit x86
@jd:body

<div id="qv-wrapper">
    <div id="qv">
      <h2>On this page</h2>

      <ol>
        <li><a href="#over">Overview</a></li>
         <li><a href="#st">Standalone Toolchain</a></li>
         <li><a href="#comp">Compatibilty</a></li>
          </ol>
        </li>
      </ol>
    </div>
  </div>

<p>The Android NDK supports the {@code x86_64} ABI. This ABI allows native code to run on
Android-based devices using CPUs that support the 64-bit x86 instruction set.</p>

<h2 id="over">Overview</h2>
<p>To generate 64-bit machine code for x86, add {@code x86_64} to the {@code APP_ABI} definition in
your {@code Application.mk} file. For example:

<pre>
APP_ABI := x86_64
</pre>

For more information on how to specify values for {@code APP_ABI}, see
<a href="{@docRoot}ndk/guides/application_mk.html">Application.mk</a>.</p>

<p>The build system places libraries generated for the {@code x86_64} ABI into
{@code $PROJECT/libs/x86_64/} on your host machine, where {@code $PROJECT} is the root directory
of your project. It also embeds them in your APK, under {@code /lib/x86_64/}.</p>

<p>The Android package manager extracts these libraries when installing your APK on a compatible
64-bit, x86-powered device, placing them under your app's private data directory.</p>

<p>In the Google Play store, the server filters applications so that a consumer sees only the native
libraries that run on the CPU powering his or her device.</p>

<h2 id="st">Standalone Toolchain</h2>

<p>You can use the 64-bit x86 toolchain in standalone mode with the NDK. For more
information about doing so, see <a href="{@docRoot}ndk/guides/standalone_toolchain.html">
Standalone Toolchain</a>, under the "Advanced method" section.

<h2 id="comp">Compatibility</h2>
<p>The NDK provides native versions of Android APIs for 64-bit x86 machine code starting from
Android 5.0 (Android API level 21). If your project files target an older API level, but include
{@code x86_64} as a targeted platform, the NDK build script automatically selects the right set of
native platform headers and libraries for you.</p>