Detecting most recent Clang tools (Bash)

detect-clang.sh

function detect_newest # Function to detect newest clang-based tool (they have a numeric suffix -<version>)
{
    local PFX=${1:-clang++}
    for v in "" -{32..1}; do test -n "$(which -- $PFX$v)" && { echo "$PFX$v"; break; }; done
}

[[ -z "$CXX" ]] && CXX=$(detect_newest clang++)
[[ -z "$CC"  ]] && CC=$(detect_newest clang)
[[ -n "$CXX" ]] || { echo -e "${cR}FATAL:${cZ} ${cW}CXX${cZ} not detected."; }
[[ -n "$CC"  ]] || { echo -e "${cR}FATAL:${cZ} ${cW}CC${cZ} not detected."; }