Install build environment on RedHat CentOS

Follow these commands to install a Casper node on a RedHat / CentOS dev machine (without npm).

Install the pre-requisite tools.

sudo yum install gcc cmake git pkg-config make openssl-devel gcc-c++

Ensure the cmake version is higher than 3.4.

cmake --version

Install the Rust toolchain (from https://www.rust-lang.org/tools/install)

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

As indicated after install, load your cargo environment:

source $HOME/.cargo/env

Or exit the shell and re-enter to load cargo in your PATH.

Then build wabt for drastically reducing the size of the wasm.

BRANCH=1.0.23
git clone --branch ${BRANCH} https://github.com/WebAssembly/wabt.git "wabt-${BRANCH}"
cd "wabt-${BRANCH}" 
git submodule update --init 
cd - 
cmake -S "wabt-${BRANCH}" -B "wabt-${BRANCH}/build" 
cmake --build "wabt-${BRANCH}/build" --parallel 8 
sudo cmake --install "wabt-${BRANCH}/build" --prefix /usr --strip -v 
rm -rf "wabt-${BRANCH}"