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<a href="_build_guide_shim_support_library_8md.xhtml">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;# How to use the Android NDK to build Arm NN</div><div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;</div><div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;- [Introduction](#introduction)</div><div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;- [Prerequisites](#prerequisites)</div><div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;- [Download Arm NN](#download-arm-nn)</div><div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;- [Build Arm Compute Library](#build-arm-compute-library)</div><div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;- [Build Arm NN](#build-arm-nn)</div><div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;- [Build Arm NN Support Library](#build-arm-nn-support-library)</div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;- [Build Arm NN Shim](#build-arm-nn-shim)</div><div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;</div><div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;</div><div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;## Introduction</div><div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;These are step by step instructions for building the Arm NN shim and support library for NNAPI.</div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;This work is currently in an experimental phase.</div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;</div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;## Prerequisites</div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;</div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;The following are required to build the Arm NN support library</div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;* Android NDK r25</div><div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;  * Detailed setup can be found in [BuildGuideAndroidNDK.md](../BuildGuideAndroidNDK.md)</div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;* Flatbuffer version 2.0.6</div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;  * Detailed setup can be found in [BuildGuideCrossCompilation.md](../BuildGuideCrossCompilation.md)</div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;</div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;The following is required to build the Arm NN shim</div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;* AOSP Source (Android Open Source Project)</div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;  * Download the source from the [official website](https://source.android.com/setup/build/downloading)</div><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;  * This guide will use release tag `android12-s1-release`</div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;</div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;</div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;Set environment variables</div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;```bash</div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;export WORKING_DIR=&lt;path to where the Arm NN source code, clframework and aosp repos will be cloned&gt;</div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;export AOSP_ROOT=&lt;path to the root of Android tree where the shim will be built&gt;</div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;export AOSP_MODULES_ROOT=&lt;path to where AOSP modules will be cloned i.e. $WORKING_DIR/aosp&gt;</div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;export ARMNN_BUILD_DIR=&lt;path to the Arm NN build directory i.e. $WORKING_DIR/build&gt;</div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;export NDK=&lt;path to&gt;android-ndk-r25</div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;export NDK_TOOLCHAIN_ROOT=$NDK/toolchains/llvm/prebuilt/linux-x86_64</div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;export PATH=$NDK_TOOLCHAIN_ROOT/bin/:$PATH</div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;export FLATBUFFERS_ANDROID_BUILD=&lt;path to flatbuffers target android build&gt;</div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;export FLATBUFFERS_X86_BUILD=&lt;path to flatbuffers host build-x86_64&gt;</div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;```</div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;</div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;## Download Arm NN</div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;If the user only wishes to build the Support Library with the NDK, the Arm NN repo can be cloned into any folder.</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;If the user also wishes to build the Arm NN Shim, for this the Arm NN repo will need to reside within</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;the Android tree in order for armnn/shim/Android.bp to be picked up by the Soong (Android) build system.</div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;For example $AOSP_ROOT/vendor/arm/armnn</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;</div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;* Clone Arm NN:</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;  (Requires Git if not previously installed: `sudo apt install git`)</div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;</div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;```bash</div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;cd $WORKING_DIR</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;git clone https://github.com/ARM-software/armnn.git</div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;```</div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;## Build Arm Compute Library</div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;</div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;Arm NN provides a script that downloads the version of Arm Compute Library that Arm NN was tested with:</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;```bash</div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;${WORKING_DIR}/armnn/scripts/get_compute_library.sh</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;```</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;* Build the Arm Compute Library:</div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;  (Requires SCons if not previously installed: `sudo apt install scons`)</div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;```bash</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;cd ${WORKING_DIR}/clframework</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;scons arch=arm64-v8a \</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;toolchain_prefix=aarch64-linux-android- \</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;compiler_prefix=aarch64-linux-android29- \</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;neon=1 opencl=1 \</div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;embed_kernels=1 \</div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;build_dir=android-arm64v8a \</div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;extra_cxx_flags=&quot;-Wno-parentheses-equality -Wno-missing-braces -fPIC&quot; \</div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;Werror=0 embed_kernels=1 examples=0 \</div><div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;validation_tests=0 benchmark_tests=0 benchmark_examples=0 os=android -j16</div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;```</div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;</div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;## Build Arm NN and Serializer</div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;* Build Arm NN:</div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;  (Requires CMake if not previously installed: `sudo apt install cmake`)</div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;```bash</div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;cd $ARMNN_BUILD_DIR</div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;CXX=aarch64-linux-android29-clang++ \</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;CC=aarch64-linux-android29-clang \</div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;CXX_FLAGS=&quot;-fPIE -fPIC&quot; cmake ${WORKING_DIR}/armnn \</div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;-DCMAKE_ANDROID_NDK=$NDK \</div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;-DCMAKE_SYSTEM_NAME=Android \</div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;-DCMAKE_SYSTEM_VERSION=29 \</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;-DCMAKE_ANDROID_ARCH_ABI=arm64-v8a \</div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;-DCMAKE_EXE_LINKER_FLAGS=&quot;-pie -llog -lz&quot; \</div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;-DARMCOMPUTE_ROOT=$WORKING_DIR/clframework/ \</div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;-DARMCOMPUTE_BUILD_DIR=$WORKING_DIR/clframework/build/android-arm64v8a/ \</div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;-DARMCOMPUTENEON=1 -DARMCOMPUTECL=1 -DARMNNREF=1 \</div><div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;-DFLATBUFFERS_ROOT=$FLATBUFFERS_ANDROID_BUILD \</div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;-DFLATC_DIR=$FLATBUFFERS_X86_BUILD \</div><div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;-DBUILD_ARMNN_SERIALIZER=1 -DBUILD_GATORD_MOCK=0 -DBUILD_BASE_PIPE_SERVER=0</div><div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;```</div><div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;</div><div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160; * Run the build</div><div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;```bash</div><div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;make -j16</div><div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;```</div><div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;</div><div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;## Build Arm NN Support Library</div><div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;</div><div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;Building the support library requires building some AOSP libraries via the NDK. </div><div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;It should be possible to use $AOSP_ROOT instead of $AOSP_MODULES_ROOT.</div><div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;</div><div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;However this example will instead clone the necessary AOSP repos outside of the Android tree and apply some minor patches</div><div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;which were required to get it to build with the Android version used in this guide.</div><div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;</div><div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;```bash</div><div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;# Call a script which will clone the necessary AOSP repos (do not clone them into Android tree)</div><div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;${WORKING_DIR}/armnn/shim/sl/scripts/clone_aosp_libs.sh $AOSP_MODULES_ROOT</div><div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;</div><div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;# Modify the repos by applying patches</div><div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;${WORKING_DIR}/armnn/shim/sl/scripts/modify_aosp_libs.sh $AOSP_MODULES_ROOT</div><div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;</div><div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;# Build the Support Library</div><div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;CMARGS=&quot;$CMARGS \</div><div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;-DCMAKE_TOOLCHAIN_FILE=$NDK/build/cmake/android.toolchain.cmake \</div><div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;-DANDROID_ABI=arm64-v8a \</div><div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;-DCMAKE_ANDROID_ARCH_ABI=arm64-v8a \</div><div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;-DCMAKE_ANDROID_NDK=$NDK \</div><div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;-DANDROID_PLATFORM=android-29 \</div><div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;-DAOSP_MODULES_ROOT=$AOSP_MODULES_ROOT \</div><div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;-DARMNN_SOURCE_DIR=$WORKING_DIR/armnn \</div><div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;-DArmnn_DIR=$ARMNN_BUILD_DIR &quot;</div><div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;</div><div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;mkdir ${WORKING_DIR}/armnn/shim/sl/build</div><div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;cd ${WORKING_DIR}/armnn/shim/sl/build</div><div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;</div><div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;CXX=aarch64-linux-android29-clang++ \</div><div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;CC=aarch64-linux-android29-clang \</div><div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;cmake $CMARGS ../</div><div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;make</div><div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;```</div><div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;</div><div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;## Build Arm NN Shim</div><div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;</div><div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;By default the Arm NN shim Android.bp.off is not enabled.</div><div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;It is enabled below by renaming it to Android.bp</div><div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;</div><div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;```bash</div><div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;cd ${WORKING_DIR}/armnn/shim</div><div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;mv Android.bp.off Android.bp</div><div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;</div><div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;cd $AOSP_ROOT</div><div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;source build/envsetup.sh</div><div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;lunch &lt;device&gt;-eng</div><div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;cd vendor/arm/armnn/shim</div><div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;export ARMNN_ANDROID_MK_ENABLE=0</div><div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;mm</div><div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;```</div><div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;</div><div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;The built libraries and manifest file can be found here:</div><div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;$AOSP_ROOT/out/target/product/&lt;device&gt;/vendor/lib64/libarmnn_support_library.so</div><div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;$AOSP_ROOT/out/target/product/&lt;device&gt;/vendor/bin/hw/android.hardware.neuralnetworks-shim-service-armnn</div><div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;$AOSP_ROOT/out/target/product/&lt;device&gt;/vendor/etc/vintf/manifest/android.hardware.neuralnetworks-shim-service-armnn.xml</div><div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;</div><div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;Currently the Arm NN libraries are shared libraries and therefore will need to be pushed to the device:</div><div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;$ARMNN_BUILD_DIR/libarmnn.so</div></div><!-- fragment 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