Why Makefile Targets Silently Fail in Infra Repos and How to Fix Them

Infrastructure repositories that wrap tools like Terraform, Docker, or kubectl behind Makefiles often suffer from silent target failures, where a command exits with status 0 but nothing actually runs. The root cause lies in Make's original design as a C compilation tool that uses file timestamps to decide whether a target needs executing. If a directory on disk shares a name with a Makefile target and that target isn't declared .PHONY, Make skips the recipe entirely without any warning. Additional pitfalls include each recipe line running in its own subshell — meaning variables and directory changes don't persist — and CI runners using dash instead of bash, causing shell-specific syntax to fail silently. Hardening the Makefile by declaring phony targets, setting an explicit shell, and enabling strict error handling can prevent these hard-to-diagnose failures.