# How to Cross-Compile ArmNN on x86_64 for arm64
* [Introduction](#introduction)
+* [Cross-compiling ToolChain](#installCCT)
* [Build and install Google's Protobuf library](#buildProtobuf)
* [Build Caffe for x86_64](#buildCaffe)
-* [Cross-compiling ToolChain](#installCCT)
* [Build Boost library for arm64](#installBaarch)
* [Build Compute Library](#buildCL)
-* [Build Compute Library](#buildCL)
* [Build ArmNN](#buildANN)
* [Run Unit Tests](#unittests)
* [Troubleshooting and Errors](#troubleshooting)
These are the step by step instructions on Cross-Compiling ArmNN under an x86_64 system to target an Arm64 system. This build flow has been tested with Ubuntu 16.04.
The instructions show how to build the ArmNN core library and the Boost, Protobuf, Caffe and Compute Libraries necessary for compilation.
+#### <a name="installCCT">Cross-compiling ToolChain</a>
+* Install the standard cross-compilation libraries for arm64:
+ ```
+ sudo apt install crossbuild-essential-arm64
+ ```
+
#### <a name="buildProtobuf">Build and install Google's Protobuf library</a>
* Get protobuf-all-3.5.1.tar.gz from here: https://github.com/protocolbuffers/protobuf/releases/tag/v3.5.1
```
mkdir arm64_build
cd arm64_build
- CC=aarch64-linux-gnu-gcc \
- CXX=aarch64-linux-gnu-g++ \
+ export CC=aarch64-linux-gnu-gcc \
+ export CXX=aarch64-linux-gnu-g++ \
../configure --host=aarch64-linux \
--prefix=$HOME/armnn-devenv/google/arm64_pb_install \
--with-protoc=$HOME/armnn-devenv/google/x86_64_pb_install/bin/protoc
#Add hdf5 and protobuf include and library directories (Replace $HOME with explicit /home/username dir):
INCLUDE_DIRS := $(PYTHON_INCLUDE) /usr/local/include /usr/include/hdf5/serial/ $HOME/armnn-devenv/google/x86_64_pb_install/include/
LIBRARY_DIRS := $(PYTHON_LIB) /usr/local/lib /usr/lib /usr/lib/x86_64-linux-gnu/hdf5/serial/ $HOME/armnn-devenv/google/x86_64_pb_install/lib/
-
- #g++ needs to be version 5:
- CUSTOM_CXX := g++-5
```
* Setup environment:
```bash
These should all run without errors
* caffe.pb.h and caffe.pb.cc will be needed when building ArmNN's Caffe Parser
-#### <a name="installCCT">Cross-compiling ToolChain</a>
-* Install the standard cross-compilation libraries for arm64:
- ```
- sudo apt install crossbuild-essential-arm64
- ```
#### <a name="installBaarch">Build Boost library for arm64</a>
* Build Boost library for arm64
Download Boost version 1.64 from http://www.boost.org/doc/libs/1_64_0/more/getting_started/unix-variants.html
- Version 1.66 is not supported.
+ Using any version of Boost greater than 1.64 will fail to build ArmNN, due to different dependency issues.
```bash
tar -zxvf boost_1_64_0.tar.gz
cd boost_1_64_0
* Use CMake to configure your build environment, update the following script and run it from the armnn/build directory to set up the armNN build:
```bash
#!/bin/bash
- CXX=aarch64-linux-gnu-g++ \
- CC=aarch64-linux-gnu-gcc \
+ export CXX=aarch64-linux-gnu-g++ \
+ export CC=aarch64-linux-gnu-gcc \
cmake .. \
-DARMCOMPUTE_ROOT=$HOME/armnn-devenv/ComputeLibrary \
-DARMCOMPUTE_BUILD_DIR=$HOME/armnn-devenv/ComputeLibrary/build/ \
-DBOOST_ROOT=$HOME/armnn-devenv/boost_arm64_install/ \
- -DARMCOMPUTENEON=1 -DARMCOMPUTECL=1 \
+ -DARMCOMPUTENEON=1 -DARMCOMPUTECL=1 -DARMNNREF=1 \
-DCAFFE_GENERATED_SOURCES=$HOME/armnn-devenv/caffe/build/src \
-DBUILD_CAFFE_PARSER=1 \
-DPROTOBUF_ROOT=$HOME/armnn-devenv/google/x86_64_pb_install/ \
-DPROTOBUF_LIBRARY_DEBUG=$HOME/armnn-devenv/google/arm64_pb_install/lib/libprotobuf.so.15.0.1 \
-DPROTOBUF_LIBRARY_RELEASE=$HOME/armnn-devenv/google/arm64_pb_install/lib/libprotobuf.so.15.0.1
```
+
+* If you want to include standalone sample dynamic backend tests, add the argument to enable the tests and the dynamic backend path to the CMake command:
+ ```bash
+ -DSAMPLE_DYNAMIC_BACKEND=1 \
+ -DDYNAMIC_BACKEND_PATHS=$SAMPLE_DYNAMIC_BACKEND_PATH
+ ```
* Run the build
```bash
make -j32
```
+#### <a name="buildStandaloneBackend">Build Standalone Sample Dynamic Backend</a>
+* The sample dynamic backend is located in armnn/src/dynamic/sample
+ ```bash
+ mkdir build
+ cd build
+ ```
+
+* Use CMake to configure your build environment, update the following script and run it from the armnn/src/dynamic/sample/build directory to set up the armNN build:
+ ```bash
+ #!/bin/bash
+ export CXX=aarch64-linux-gnu-g++ \
+ export CC=aarch64-linux-gnu-gcc \
+ cmake .. \
+ -DCMAKE_CXX_FLAGS=--std=c++14 \
+ -DBOOST_ROOT=$HOME/armnn-devenv/boost_arm64_install/ \
+ -DBoost_SYSTEM_LIBRARY=$HOME/armnn-devenv/boost_arm64_install/lib/libboost_system.a \
+ -DBoost_FILESYSTEM_LIBRARY=$HOME/armnn-devenv/boost_arm64_install/lib/libboost_filesystem.a \
+ -DARMNN_PATH=$HOME/armnn-devenv/armnn/build/libarmnn.so
+ ```
+
+* Run the build
+ ```bash
+ make
+ ```
+
#### <a name="unittests">Run Unit Tests</a>
* Copy the build folder to an arm64 linux machine
* Copy the libprotobuf.so.15.0.1 library file to the build folder
+* If you enable the standalone sample dynamic tests, also copy libArm_SampleDynamic_backend.so library file to the folder specified as $SAMPLE_DYNAMIC_BACKEND_PATH when you build ArmNN
* cd to the build folder on your arm64 machine and set your LD_LIBRARY_PATH to its current location:
```
cd build/
projects / platform / upstream / armnn.git / blobdiff