# compile foobar.hs
# creates "foobar" executable in .
ghc foobar.hs

# high optimization
ghc -O2 foobar.hs
# no optimization, good for debugging
ghc -O0 foobar.hs

# profiling
ghc -prof -caf-all -auto-all foobar.hs
# create a profile report! (foobar.prof)
./foobar +RTS -p -RTS
# show all exception stack traces!
./foobar +RTS -xc -RTS

# force recompilation (even if foobar.o exists already)
ghc -fforce-recomp foobar.hs