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Install several GCC versions on Ubuntu ​

Launch the following script to have several versions of GCC on Ubuntu alongside the default one, manage the different GCC versions using update-alternatives. This works also for Windows Subsystem for Linux.

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bash
#!/bin/bash
# add gcc 13 and gcc 14 to Ubuntu 24.04
# launch this script using "sudo"
# check for non official gcc versions on:
# https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/test?field.series_filter=

# install the default building tools
apt update
apt install -y build-essential software-properties-common

# install other GCC versions
apt install -y gcc-14 g++-14

# configure the alternatives for gcc and g++, setting a higher priority to a newer version (ymmv)
update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-13 50 --slave /usr/bin/g++ g++ /usr/bin/g++-13
update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-14 60 --slave /usr/bin/g++ g++ /usr/bin/g++-14

# check or change the alternatives configuration
update-alternatives --config gcc

Install several Clang versions on Ubuntu ​

Launch the following script to have several versions of Clang on Ubuntu alongside the default one: install some Clang versions using the LLVM Ubuntu/Debian packages and manage the different Clang versions using update-alternatives. This works also for Windows Subsystem for Linux.

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bash
#!/bin/bash
# add Clang 18 and Clang 19 to a clean Ubuntu
wget https://apt.llvm.org/llvm.sh
sudo apt update
sudo bash llvm.sh 18
sudo bash llvm.sh 19

# configure the alternatives for clang and llvm-profdata, setting a higher priority to a newer version (ymmv)
sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-19 60 --slave /usr/bin/clang++ clang++ /usr/bin/clang++-19 --slave /usr/bin/llvm-profdata llvm-profdata /usr/bin/llvm-profdata-19
sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-18 40 --slave /usr/bin/clang++ clang++ /usr/bin/clang++-18 --slave /usr/bin/llvm-profdata llvm-profdata /usr/bin/llvm-profdata-18

# check or change the alternatives configuration
sudo update-alternatives --config clang

# to uninstall a Clang version
# LLVM_VERSION=18
# sudo apt purge -y clang-$LLVM_VERSION lldb-$LLVM_VERSION lld-$LLVM_VERSION clangd-$LLVM_VERSION && sudo apt autoremove -y

Install a pull request ​

The script below fetches and checks out a pull request. Assuming the script is named pull.sh and is in the current directory, it is used as

sh
./pull.sh PULL_ID
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sh
#!/bin/sh
BRANCH_NAME=PR$1
git checkout master
git branch $BRANCH_NAME -D
git fetch origin pull/$1/head:$BRANCH_NAME
git checkout $BRANCH_NAME