When compiling your tool against llvm5.0-devel , force the old ABI:
llvm5.0-devel allows you to keep that legacy analysis pass alive without rewriting it for modern LLVM. You won't find this in apt default repos for Ubuntu 22.04+. You need specific EPEL or Legacy repos. On RHEL 7 / CentOS 7 (EPEL): sudo yum install epel-release sudo yum install llvm5.0-devel # Installs to: /usr/lib64/llvm5.0/ On Ubuntu 18.04 (Bionic) - Old repos: sudo apt install llvm-5.0-dev On Modern Systems (Manual Install): You likely need to build from source or use a Docker container: llvm5.0-devel
In the fast-paced world of compilers, LLVM 18 and 19 are currently making headlines. So, why on earth would anyone write a blog post about llvm5.0-devel in 2026? When compiling your tool against llvm5