For future reference

cmake -DCMAKE_BUILD_TYPE=PROFILE ..




egel -e "import \"prelude.eg\";; using System;; using List;; foldl (+) 0 (from_to 0 1000000)"

/opt/homebrew/Cellar/llvm@12/12.0.1_1/bin/llvm-profdata merge -sparse default.profraw -o default.profdata

/opt/homebrew/Cellar/llvm@12/12.0.1_1/bin/llvm-profdata show -all-functions default.profraw