Merge "Change notes for NDK r10d, to publish to DAC" into lmp-docs

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 <p>

   <a href="#" onclick="return toggleContent(this)"> <img

     src="/assets/images/triangle-opened.png" class="toggle-content-img" alt=""

   >Android NDK, Revision 10d</a> <em>(December 2014)</em>

 </p>

 <div class="toggle-content-toggleme">

    <dl>

      <dt>Important changes:</dt>

      <dd>

      <ul>

        <li>Made GCC 4.8 the default for all 32-bit ABIs.  Deprecated GCC 4.6, and

            will remove it next release. To restore previous behavior, either add

            <code>NDK_TOOLCHAIN_VERSION=4.6</code> to ndk-build, or

            add <code>--toolchain=arm-linux-androideabi-4.6</code> when executing

            <code>make-standalone-toolchain.sh</code> on the command line. GCC 4.9 remains the

            default for 64-bit ABIs.</li>

         <li>Stopped all x86[_64] toolchains from adding <code>-mstackrealign</code> by default. The

             NDK toolchain assumes a 16-byte stack alignment. The tools and options used by default

             enforce this rule. A user writing assembly code must make sure to preserve stack

             alignment, and ensure that other compilers also comply with this rule.

             (GCC bug <a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38496">38496</a>)</li>

         <li>Added Address Sanitizer functionality to Clang 3.5 support to the ARM and x86 ABIs.

             For more information on this change, see the

             <a href="https://code.google.com/p/address-sanitizer/wiki/Android">Address

             Sanitizer</a> project.</li>

         <li>Introduced the requirement, starting from API level 21, to use <code>-fPIE -pie

             </code> when building. In API levels 16 and higher, ndk-build uses <code>PIE</code>

             when building. This change has a number of implications, which are discussed in

             <a href="https://code.google.com/p/android-developer-preview/issues/detail?id=888">

             Developer Preview Issue 888</a>.

             These implications do not apply to shared libraries.</li>

      </ul>

      </dd>

   <dl>

     <dt>Important bug fixes:</dt>

     <dd>

     <ul>

        <li>Made more fixes related to

            <a href="https://gcc.gnu.org/ml/gcc-patches/2014-10/msg00906.html">

            A53 Errata #835769</a> in the aarch64-linux-android-4.9 linker. As part of this, GCC

            passes a new option, <code>--fix-cortex-a53-835769</code>, when

            <code>-mfix-cortex-a53-835769</code> (enabled by default) is specified.

            For more information, see this

            <a href="https://sourceware.org/ml/binutils/2014-10/msg00198.html">binutils message</a>

            and this

            <a href="https://sourceware.org/ml/binutils/2014-11/msg00287.html">binutils message</a>.

            </li>

        <li>Documented a fix to a libc++ <code>sscanf/vsscanf</code> hang that occurred in API level

            21. The fix itself had been implemented in r10c.

            (Issue <a href="http://b.android.com/77988">77988</a>)</li>

        <li>Fixed an AutoFDO (<code>-fauto-profile</code>) crash that occurred with GCC 4.9 when

            <code>-Os</code> was specified. (Issue <a href="http://b.android.com/77571">77571</a>)</li>

     </ul>

     </dd>

     <dt>Other bug fixes:</dt>

     <dd>

     <ul>

        <li>Made the following header and library fixes:</li>

           <ul>

        <li>Added <code>posix_memalign</code> to API level 16. Also, added a prototype in

            <code>stdlib.h</code> to API levels 16 to 19.

            (Issue <a href="http://b.android.com/77861">77861</a>)</li>

        <li>Fixed <code>stdatomic.h</code> so that it includes <code>&lt;atomic&gt;</code> only for

            C++11.</li>

        <li>Modified the following headers for standalone use: <code>sys/user.h</code>, and

            <code>gl2ext.h</code>, <code>dlext.h</code>, <code>fts.h</code>, <code>sgidefs.h</code>

            for API level 21.</li>

        <li>Modified <code>sys/user.h</code> to rename <code>mxcsr_mask</code> as <code>mxcr_mask</code>,

            and to change the data type for <code>u_ar0</code></li> from <code>unsigned long</code>

            to </code>struct user_regs_struct*</code>.

        <li>Changed <code>sysconf()</code> return value type from <code>int</code> to

            <code>long</code>.</li>

           </ul>

        <li>Fixed ndk-build's handling of <code>thumb</code> for <code>LOCAL_ARM_MODE</code>: In

            r10d, ndk-build adds <code>LOCAL_LDFLAGS+=-mthumb</code> by default, unless one of the

            following conditions applies:</li>

          <ul>

            <li>You have set <code>LOCAL_ARM_MODE</code> equal to <code>arm</code>.</li>

            <li>You are doing a debug build (with settings such as <code>APP_OPTIM=debug</code> and

            <code>AndroidManifest.xml</code> containing <code>android:debuggable="true"</code>),

            where ARM mode is the default in order to retain compatibility with earlier toolchains.

            (Issue <a href="http://b.android.com/74040">74040</a>)</li>

          </ul>

        <li>Fixed <code>LOCAL_SRC_FILES</code> in ndk-build to use Windows absolute paths.

            (Issue <a href="http://b.android.com/74333">74333</a>)</li>

        <li>Removed bash-specific code from ndk-gdb. (Issue <a href="http://b.android.com/73338">73338</a>)</li>

        <li>Removed bash-specific code from <code>make-standalone-toolchain.sh</code>.

            (Issue <a href="http://b.android.com/74145">74145)</a></li>

        <li>Revised documentation concerning a fix for <code>System.loadLibrary()</code> transitive

            dependencies. (Issue <a href="http://b.android.com/41790">41790</a>)</li>

        <li>Fixed a problem that was preventing 64-bit packages from extracting on Ubuntu 14.04 and

            OS X 10.10 (Yosemite). (Issue <a href="http://b.android.com/78148">78148</a>)</li>

        <li>Fixed an issue with <code>LOCAL_PCH</code> to improve Clang support. (Issue

            <a href="http://b.android.com/77575">77575</a>)</li>

        <li>Clarified "requires executable stack" warning from ld.gold. (Issue

            <a href="http://b.android.com/79115">79115</a>)</li>

     </ul>

     </dd>

   </dl>

 </div>

</div>

<div class="toggle-content closed">

 <p>

   <a href="#" onclick="return toggleContent(this)"> <img

     src="/assets/images/triangle-closed.png" class="toggle-content-img" alt=""

   >Android NDK, Revision 10c</a> <em>(October 2014)</em>

 </p>

 <div class="toggle-content-toggleme">

 </div>

</div>

<div class="toggle-content closed">

 <p>

   <a href="#" onclick="return toggleContent(this)"> <img