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@bhaskarvk
bhaskarvk / Setup GCC and CLANG Toolchains.md
Last active July 17, 2026 14:54
Proper GCC (vers. 5/6/7) & LLVM/CLANG (vers. 4/5) Toolchain Setup on Ubuntu/Linux Mint

This approach uses update-alternatives to manage GCC and LLVM/CLANG C/C++ compiler toolchains. Although tested on Linux Mint 18.3, this approach should work on any Debian based distro or for that matter any Linux distro with update-alternatives support, provided the packages are installed correctly.

There are 3 files

  • gcc-alternatives.sh installs GCC versions 5/6/7 and sets up alternatives for gcc/g++/cpp/gfortran.
  • llvm-clang-alternatives.sh installs LLVM and CLANG versions 4/5 and sets up alternatives for various LLVM and CLANG programs including clang and clang++.
  • cc-alternatives.sh sets up alternatives for the cc, cxx, and the ld commands. This script can be used to change systemwide default compiler/linker combination to either GCC or CLANG.

Once these scripts are run you can change the system GCC/CLANG versions by running sudo update-alternatives --config gcc|clang. To change the default compiler/linker combo used by t

@alex-leonhardt
alex-leonhardt / main.go
Last active October 11, 2024 11:34
golang text/template with a map[string]interface{} populated from mixed json data
package main
import (
"encoding/json"
"os"
"reflect"
"text/template"
)
@kawsark
kawsark / vault-agent-pki
Last active February 3, 2025 23:16
Vault Agent with PKI certificate rendering
### Configure variables
These variables will be used for this snippet. Please substitute accordingly.
```bash
export RootCAName="root_ca"
export InterCAName="inter_ca"
export CommonName="hashidemos.io"
export InterCommonName="inter.hashidemos.io"
export Root_CA_ttl="730h"
export Inter_CA_ttl="350h"
export Cert_ttl="8h"
@xykong
xykong / k8sdump.sh
Last active September 23, 2025 17:20
Export Kubernetes cluster resource to yaml.
#!/usr/bin/env bash
readonly SCRIPT=$(basename "$0")
readonly VERSION='1.0.0'
readonly AUTHOR='xy.kong@gmail.com'
readonly SOURCE='https://gist.github.com/xykong/6efdb1ed57535d18cb63aa8e20da3f4b'
# For script running robust
set -o nounset # to exit when your script tries to use undeclared variables
set -o errexit # to make your script exit when a command fails
@oleduc
oleduc / isolate-cpus.sh
Last active November 2, 2025 15:32
CPU isolation bash script for KVM QEMU VFIO gpu passthrough for virtual machine performance optimizations using libvirt-hooks and cgroups
#!/bin/bash
# Cores reserved for the host machine
# Must include QEMU IO/Emulation cores if configured
# Ex: 1st Core -> reserved=0
# Ex: 1st & 2nt Cores -> reserved=0,1
# Ex: 1st Physical Core (16 Virtual Cores) -> reserved=0,8
reserved=0,8
# Host core range numbered from 0 to core count - 1
@bketelsen
bketelsen / 1-nix.sh
Created June 1, 2023 15:20
Get Going with Nix Development Environments
#!/bin/bash
curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s -- install