The preceding sections describe driver options that are mostly applicable to one particular phase. You may also force a specific option `<option>' to be passed to a particular phase `<phase-code>' by feeding the driver the option `-opt<phase-code><option>'. The codes to indicate the phases are the same as in the previous section.
So, for example, to force an `-Ewurble' option to the assembler, you would tell the driver `-opta-Ewurble' (the dash before the E is required).
Besides getting options to the Haskell compiler with `-optC<blah>', you can get options through to its runtime system with `-optCrts<blah>'.
So, for example: when I want to use my normal driver but with my profiled compiler binary, I use this script:
#! /bin/sh exec /local/grasp_tmp3/partain/ghc-BUILDS/working-alpha/ghc/driver/ghc \ -pgmC/local/grasp_tmp3/partain/ghc-BUILDS/working-hsc-prof/hsc \ -optCrts-i0.5 \ -optCrts-PT \ "$@"