Install clang-21

install-clang-21.sh

# TON is moving to clang-21 for very pragmatic reasons — not because it's fashionable, 
# but because it materially improves what we ship.

# We use clang-21 because we want the best C++ the language currently offers, 
# stronger safety guarantees, better diagnostics, better generated code, and a toolchain that won't rot under us.

# Important! Remember, at this time no TON fullnodes or validators should be running on Ubuntu 20.04.
# This guide shows how to install clang-21 on Ubuntu 22.04 and 24.04 only.

# Ubuntu 22.04
sudo apt install lsb-release wget software-properties-common gnupg
wget https://apt.llvm.org/llvm.sh
chmod +x llvm.sh
sudo ./llvm.sh 21 clang

# Ubuntu 24.04
wget -qO- https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
echo "deb http://apt.llvm.org/noble/ llvm-toolchain-noble-21 main" | sudo tee /etc/apt/sources.list.d/llvm.list
sudo apt -y update
sudo apt install -y clang-21

# optionally, change default clang
sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-21 200
sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-21 200


# update TON validator using MyTonCtrl
echo update master | mytonctrl
echo upgrade master | mytonctrl

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