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Dec 10, 2018
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Update BUILD.md #140

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36 changes: 19 additions & 17 deletions BUILD.md
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Original file line number Diff line number Diff line change
Expand Up @@ -157,25 +157,27 @@ We've experimental support for Linux ARM builds. Windows on ARM is well tested.
### Cross compiling on Linux(FASTER)
1. Get the corresponding toolchain. For example, if your device is Raspberry Pi and the device os is Ubuntu 16.04, you may use gcc-linaro-6.3.1 from [https://releases.linaro.org/components/toolchain/binaries](https://releases.linaro.org/components/toolchain/binaries)
2. Setup env vars
```bash
export PATH=/opt/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin:$PATH
export CC=arm-linux-gnueabihf-gcc
export CXX=arm-linux-gnueabihf-g++
```
```bash
export PATH=/opt/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin:$PATH
export CC=arm-linux-gnueabihf-gcc
export CXX=arm-linux-gnueabihf-g++
```
3. Get a pre-compiled protoc:
You may get it from https://github.com/protocolbuffers/protobuf/releases/download/v3.6.1/protoc-3.6.1-linux-x86_64.zip . Please unzip it after downloading.
4. Save the following content as tool.cmake
```
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR arm)
set(CMAKE_CXX_COMPILER arm-linux-gnu-c++)
set(CMAKE_C_COMPILER arm-linux-gnu-gcc)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
```
5. append "-DCMAKE_TOOLCHAIN_FILE=path/to/tool.cmake" to your cmake args, run cmake and make to build it.
4. (optional) Setup sysroot for enabling python extension. (TODO: will add details later)
5. Save the following content as tool.cmake
```
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR arm)
set(CMAKE_CXX_COMPILER arm-linux-gnueabihf-c++)
set(CMAKE_C_COMPILER arm-linux-gnueabihf-gcc)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
```
6. Append "-DONNX_CUSTOM_PROTOC_EXECUTABLE=/path/to/protoc -DCMAKE_TOOLCHAIN_FILE=path/to/tool.cmake" to your cmake args, run cmake and make to build it.


### Native compiling on Linux (SLOWER)

Expand Down