opt_SpecialiseTrace = lookup SLIT("-ftrace-specialisation")
opt_SpecialiseUnboxed = lookup SLIT("-fspecialise-unboxed")
opt_StgDoLetNoEscapes = lookup SLIT("-flet-no-escape")
-opt_UseGetMentionedVars = lookup SLIT("-fuse-get-mentioned-vars")
opt_Verbose = lookup SLIT("-v")
opt_AsmTarget = lookup_str "-fasm="
opt_SccGroup = lookup_str "-G="