xc-bela-cmake

This repository (should) contain all you need to cross compile on Ubuntu for the bela plaftorm with the following toolchain

Linaro 7 for C++17 support
cmake >= 3.6
qemu-arm-static for local emulation & testing
VSCode integration
clangd integration

This is a first really quick draft to start sharing it. If you notice anything please don't hesitate to open an issue, I'd like to help as much as possible.

Setup

Prerequisites

On Ubuntu you'll probably requires this packages :

apt-get install build-essentials cmake git qemu-user-static clangd gdb-multiarch

Then clone the repo :

git clone --recurse-submodules git@github.com:maxmarsc/xc-bela-cmake.git

Linaro

# Linaro
mkdir /usr/local/linaro
sudo chmod 777 /usr/local/linaro/
cd /usr/local/linaro
wget https://releases.linaro.org/components/toolchain/binaries/7.5-2019.12/arm-linux-gnueabihf/gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf.tar.xz
tar xf gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf.tar.xz
mv gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf arm-bela-linux-gnueabihf
rm -r gcc-linaro-7.5.0-2019.12.02-x86_64_arm-linux-gnueabihf.tar.xz

Bela librairies and headers

Warning : this could delete the projects located on your board, in doubt make a backup

# Build the libraries -- needs the Bela board to be connected
scp BelaExtras/CustomMakefile* root@bela.local:~/Bela
ssh root@bela.local "cd Bela && rm lib/*"
ssh root@bela.local "cd Bela && make -f Makefile.libraries cleanall && make -f Makefile.libraries all"
ssh root@bela.local "cd Bela && make lib && make libbelafull"

# Bela Sysroot -- needs the Bela board to be connected
./BelaExtras/SyncBelaSysroot.sh

# Additional step to install gdbserver on the board for remote debugging
ssh root@bela.local "apt-get install -y gdbserver"

Build & testing

To build with cmake on the command line run :

cmake -B build -DCMAKE_TOOLCHAIN_FILE:FILEPATH=Toolchain.cmake .
cmake --build build -j$(nproc) --target bela_executable

Testing

CMake is preconfigured to call qemu-arm-static to run any Bela executable on your machine. If you want to do it manually you can do it this way :

qemu-arm-static -L /usr/local/linaro/arm-bela-linux-gnueabihf/arm-linux-gnueabihf/libc <your_executable>

VSCode integration

I try to integrate as much as I could into VSCode workflow. I suggest the following extensions :

Once the toolchain is selected for cmake you can use the CMake integration quite easily

Debugging targets

I provided two debugging targets (using the native-debugger extension):

[Tests] Attach to local gdbserver : localy run tests using qemu, default to build/bin/tests
[Belacid] Attach to gdbserver : remotly start the exectuable with gdbserver on the Bela board and connect to it with gdb-multiarch

Kudos

Thanks to these repos for hints & tips,