1 {-# OPTIONS -#include "hschooks.h" #-}
3 -----------------------------------------------------------------------------
4 -- $Id: DriverFlags.hs,v 1.58 2001/06/14 12:50:06 simonpj Exp $
8 -- (c) Simon Marlow 2000
10 -----------------------------------------------------------------------------
13 processArgs, OptKind(..), static_flags, dynamic_flags,
15 getOpts, getVerbFlag, addCmdlineHCInclude,
20 #include "HsVersions.h"
24 import SysTools ( setTmpDir, setPgm, setDryRun, showGhcUsage )
32 import System ( exitWith, ExitCode(..) )
39 -----------------------------------------------------------------------------
42 -- Flag parsing is now done in stages:
44 -- * parse the initial list of flags and remove any flags understood
45 -- by the driver only. Determine whether we're in multi-compilation
46 -- or single-compilation mode (done in Main.main).
48 -- * gather the list of "static" hsc flags, and assign them to the global
49 -- static hsc flags variable.
51 -- * build the inital DynFlags from the remaining flags.
53 -- * complain if we've got any flags left over.
55 -- * for each source file: grab the OPTIONS, and build a new DynFlags
56 -- to pass to the compiler.
58 -----------------------------------------------------------------------------
59 -- Process command-line
62 = NoArg (IO ()) -- flag with no argument
63 | HasArg (String -> IO ()) -- flag has an argument (maybe prefix)
64 | SepArg (String -> IO ()) -- flag has a separate argument
65 | Prefix (String -> IO ()) -- flag is a prefix only
66 | OptPrefix (String -> IO ()) -- flag may be a prefix
67 | AnySuffix (String -> IO ()) -- flag is a prefix, pass whole arg to fn
68 | PassFlag (String -> IO ()) -- flag with no arg, pass flag to fn
69 | PrefixPred (String -> Bool) (String -> IO ())
70 | AnySuffixPred (String -> Bool) (String -> IO ())
72 processArgs :: [(String,OptKind)] -> [String] -> [String]
73 -> IO [String] -- returns spare args
74 processArgs _spec [] spare = return (reverse spare)
76 processArgs spec args@(('-':arg):args') spare = do
77 case findArg spec arg of
78 Just (rest,action) -> do args' <- processOneArg action rest args
79 processArgs spec args' spare
80 Nothing -> processArgs spec args' (('-':arg):spare)
82 processArgs spec (arg:args) spare =
83 processArgs spec args (arg:spare)
85 processOneArg :: OptKind -> String -> [String] -> IO [String]
86 processOneArg action rest (dash_arg@('-':arg):args) =
90 then io >> return args
91 else unknownFlagErr dash_arg
95 then fio rest >> return args
97 [] -> unknownFlagErr dash_arg
98 (arg1:args1) -> fio arg1 >> return args1
102 [] -> unknownFlagErr dash_arg
103 (arg1:args1) -> fio arg1 >> return args1
107 then fio rest >> return args
108 else unknownFlagErr dash_arg
112 then fio rest >> return args
113 else unknownFlagErr dash_arg
115 OptPrefix fio -> fio rest >> return args
117 AnySuffix fio -> fio dash_arg >> return args
119 AnySuffixPred p fio -> fio dash_arg >> return args
123 then unknownFlagErr dash_arg
124 else fio dash_arg >> return args
126 findArg :: [(String,OptKind)] -> String -> Maybe (String,OptKind)
128 = case [ (remove_spaces rest, k)
130 Just rest <- [my_prefix_match pat arg],
136 arg_ok (NoArg _) rest arg = null rest
137 arg_ok (HasArg _) rest arg = True
138 arg_ok (SepArg _) rest arg = null rest
139 arg_ok (Prefix _) rest arg = not (null rest)
140 arg_ok (PrefixPred p _) rest arg = not (null rest) && p rest
141 arg_ok (OptPrefix _) rest arg = True
142 arg_ok (PassFlag _) rest arg = null rest
143 arg_ok (AnySuffix _) rest arg = True
144 arg_ok (AnySuffixPred p _) rest arg = p arg
146 -----------------------------------------------------------------------------
149 -- note that ordering is important in the following list: any flag which
150 -- is a prefix flag (i.e. HasArg, Prefix, OptPrefix, AnySuffix) will override
151 -- flags further down the list with the same prefix.
154 [ ------- help -------------------------------------------------------
155 ( "?" , NoArg showGhcUsage)
156 , ( "-help" , NoArg showGhcUsage)
159 ------- version ----------------------------------------------------
160 , ( "-version" , NoArg (do hPutStrLn stdout (cProjectName
161 ++ ", version " ++ cProjectVersion)
162 exitWith ExitSuccess))
163 , ( "-numeric-version", NoArg (do hPutStrLn stdout cProjectVersion
164 exitWith ExitSuccess))
166 ------- verbosity ----------------------------------------------------
167 , ( "n" , NoArg setDryRun )
169 ------- recompilation checker --------------------------------------
170 , ( "recomp" , NoArg (writeIORef v_Recomp True) )
171 , ( "no-recomp" , NoArg (writeIORef v_Recomp False) )
173 ------- ways --------------------------------------------------------
174 , ( "prof" , NoArg (addNoDups v_Ways WayProf) )
175 , ( "unreg" , NoArg (addNoDups v_Ways WayUnreg) )
176 , ( "ticky" , NoArg (addNoDups v_Ways WayTicky) )
177 , ( "parallel" , NoArg (addNoDups v_Ways WayPar) )
178 , ( "gransim" , NoArg (addNoDups v_Ways WayGran) )
179 , ( "smp" , NoArg (addNoDups v_Ways WaySMP) )
180 , ( "debug" , NoArg (addNoDups v_Ways WayDebug) )
183 ------ Debugging ----------------------------------------------------
184 , ( "dppr-noprags", PassFlag (add v_Opt_C) )
185 , ( "dppr-debug", PassFlag (add v_Opt_C) )
186 , ( "dppr-user-length", AnySuffix (add v_Opt_C) )
187 -- rest of the debugging flags are dynamic
189 --------- Profiling --------------------------------------------------
190 , ( "auto-dicts" , NoArg (add v_Opt_C "-fauto-sccs-on-dicts") )
191 , ( "auto-all" , NoArg (add v_Opt_C "-fauto-sccs-on-all-toplevs") )
192 , ( "auto" , NoArg (add v_Opt_C "-fauto-sccs-on-exported-toplevs") )
193 , ( "caf-all" , NoArg (add v_Opt_C "-fauto-sccs-on-individual-cafs") )
194 -- "ignore-sccs" doesn't work (ToDo)
196 , ( "no-auto-dicts" , NoArg (add v_Anti_opt_C "-fauto-sccs-on-dicts") )
197 , ( "no-auto-all" , NoArg (add v_Anti_opt_C "-fauto-sccs-on-all-toplevs") )
198 , ( "no-auto" , NoArg (add v_Anti_opt_C "-fauto-sccs-on-exported-toplevs") )
199 , ( "no-caf-all" , NoArg (add v_Anti_opt_C "-fauto-sccs-on-individual-cafs") )
201 ------- Miscellaneous -----------------------------------------------
202 , ( "no-link-chk" , NoArg (return ()) ) -- ignored for backwards compat
203 , ( "no-hs-main" , NoArg (writeIORef v_NoHsMain True) )
205 ------- Output Redirection ------------------------------------------
206 , ( "odir" , HasArg (writeIORef v_Output_dir . Just) )
207 , ( "o" , SepArg (writeIORef v_Output_file . Just) )
208 , ( "osuf" , HasArg (writeIORef v_Object_suf . Just) )
209 , ( "hcsuf" , HasArg (writeIORef v_HC_suf . Just) )
210 , ( "hisuf" , HasArg (writeIORef v_Hi_suf) )
211 , ( "hidir" , HasArg (writeIORef v_Hi_dir . Just) )
212 , ( "buildtag" , HasArg (writeIORef v_Build_tag) )
213 , ( "tmpdir" , HasArg setTmpDir)
214 , ( "ohi" , HasArg (writeIORef v_Output_hi . Just) )
217 , ( "keep-hc-file" , AnySuffix (\_ -> writeIORef v_Keep_hc_files True) )
218 , ( "keep-s-file" , AnySuffix (\_ -> writeIORef v_Keep_s_files True) )
219 , ( "keep-raw-s-file", AnySuffix (\_ -> writeIORef v_Keep_raw_s_files True) )
220 , ( "keep-tmp-files" , AnySuffix (\_ -> writeIORef v_Keep_tmp_files True) )
222 , ( "split-objs" , NoArg (if can_split
223 then do writeIORef v_Split_object_files True
224 add v_Opt_C "-fglobalise-toplev-names"
225 else hPutStrLn stderr
226 "warning: don't know how to split \
227 \object files on this architecture"
230 ------- Include/Import Paths ----------------------------------------
231 , ( "i" , OptPrefix (addToDirList v_Import_paths) )
232 , ( "I" , Prefix (addToDirList v_Include_paths) )
234 ------- Libraries ---------------------------------------------------
235 , ( "L" , Prefix (addToDirList v_Library_paths) )
236 , ( "l" , Prefix (add v_Cmdline_libraries) )
238 ------- Packages ----------------------------------------------------
239 , ( "package-name" , HasArg (\s -> add v_Opt_C ("-inpackage="++s)) )
241 , ( "package" , HasArg (addPackage) )
242 , ( "syslib" , HasArg (addPackage) ) -- for compatibility w/ old vsns
244 ------- Specific phases --------------------------------------------
245 , ( "pgm" , HasArg setPgm )
247 , ( "optdep" , HasArg (add v_Opt_dep) )
248 , ( "optl" , HasArg (add v_Opt_l) )
249 , ( "optdll" , HasArg (add v_Opt_dll) )
251 ----- Linker --------------------------------------------------------
252 , ( "static" , NoArg (writeIORef v_Static True) )
253 , ( "dynamic" , NoArg (writeIORef v_Static False) )
254 , ( "rdynamic" , NoArg (return ()) ) -- ignored for compat w/ gcc
256 ----- RTS opts ------------------------------------------------------
257 , ( "H" , HasArg (setHeapSize . fromIntegral . decodeSize) )
258 , ( "Rghc-timing" , NoArg (enableTimingStats) )
260 ------ Compiler flags -----------------------------------------------
261 , ( "O2-for-C" , NoArg (writeIORef v_minus_o2_for_C True) )
262 , ( "O" , OptPrefix (setOptLevel) )
264 , ( "fno-asm-mangling" , NoArg (writeIORef v_Do_asm_mangling False) )
266 , ( "fmax-simplifier-iterations",
267 Prefix (writeIORef v_MaxSimplifierIterations . read) )
269 , ( "fusagesp" , NoArg (do writeIORef v_UsageSPInf True
270 add v_Opt_C "-fusagesp-on") )
272 , ( "fexcess-precision" , NoArg (do writeIORef v_Excess_precision True
273 add v_Opt_C "-fexcess-precision"))
275 -- Optimisation flags are treated specially, so the normal
276 -- -fno-* pattern below doesn't work. We therefore allow
277 -- certain optimisation passes to be turned off explicitly:
278 , ( "fno-strictness" , NoArg (writeIORef v_Strictness False) )
279 , ( "fno-cpr" , NoArg (writeIORef v_CPR False) )
280 , ( "fno-cse" , NoArg (writeIORef v_CSE False) )
282 -- All other "-fno-<blah>" options cancel out "-f<blah>" on the hsc cmdline
283 , ( "fno-", PrefixPred (\s -> isStaticHscFlag ("f"++s))
284 (\s -> add v_Anti_opt_C ("-f"++s)) )
286 -- Pass all remaining "-f<blah>" options to hsc
287 , ( "f", AnySuffixPred (isStaticHscFlag) (add v_Opt_C) )
292 ( "cpp", NoArg (updDynFlags (\s -> s{ cppFlag = True })) )
293 , ( "#include", HasArg (addCmdlineHCInclude) )
295 , ( "v", OptPrefix (setVerbosity) )
297 , ( "optL", HasArg (addOpt_L) )
298 , ( "optP", HasArg (addOpt_P) )
299 , ( "optc", HasArg (addOpt_c) )
300 , ( "optm", HasArg (addOpt_m) )
301 , ( "opta", HasArg (addOpt_a) )
303 ------ HsCpp opts ---------------------------------------------------
304 , ( "D", Prefix (\s -> addOpt_P ("-D'"++s++"'") ) )
305 , ( "U", Prefix (\s -> addOpt_P ("-U'"++s++"'") ) )
307 ------ Debugging ----------------------------------------------------
308 , ( "dstg-stats", NoArg (writeIORef v_StgStats True) )
310 , ( "ddump-absC", NoArg (setDynFlag Opt_D_dump_absC) )
311 , ( "ddump-asm", NoArg (setDynFlag Opt_D_dump_asm) )
312 , ( "ddump-cpranal", NoArg (setDynFlag Opt_D_dump_cpranal) )
313 , ( "ddump-deriv", NoArg (setDynFlag Opt_D_dump_deriv) )
314 , ( "ddump-ds", NoArg (setDynFlag Opt_D_dump_ds) )
315 , ( "ddump-flatC", NoArg (setDynFlag Opt_D_dump_flatC) )
316 , ( "ddump-foreign", NoArg (setDynFlag Opt_D_dump_foreign) )
317 , ( "ddump-inlinings", NoArg (setDynFlag Opt_D_dump_inlinings) )
318 , ( "ddump-occur-anal", NoArg (setDynFlag Opt_D_dump_occur_anal) )
319 , ( "ddump-parsed", NoArg (setDynFlag Opt_D_dump_parsed) )
320 , ( "ddump-realC", NoArg (setDynFlag Opt_D_dump_realC) )
321 , ( "ddump-rn", NoArg (setDynFlag Opt_D_dump_rn) )
322 , ( "ddump-simpl", NoArg (setDynFlag Opt_D_dump_simpl) )
323 , ( "ddump-simpl-iterations", NoArg (setDynFlag Opt_D_dump_simpl_iterations) )
324 , ( "ddump-spec", NoArg (setDynFlag Opt_D_dump_spec) )
325 , ( "ddump-sat", NoArg (setDynFlag Opt_D_dump_sat) )
326 , ( "ddump-stg", NoArg (setDynFlag Opt_D_dump_stg) )
327 , ( "ddump-stranal", NoArg (setDynFlag Opt_D_dump_stranal) )
328 , ( "ddump-tc", NoArg (setDynFlag Opt_D_dump_tc) )
329 , ( "ddump-types", NoArg (setDynFlag Opt_D_dump_types) )
330 , ( "ddump-rules", NoArg (setDynFlag Opt_D_dump_rules) )
331 , ( "ddump-usagesp", NoArg (setDynFlag Opt_D_dump_usagesp) )
332 , ( "ddump-cse", NoArg (setDynFlag Opt_D_dump_cse) )
333 , ( "ddump-worker-wrapper", NoArg (setDynFlag Opt_D_dump_worker_wrapper) )
334 , ( "dshow-passes", NoArg (setVerbosity "2") )
335 , ( "ddump-rn-trace", NoArg (setDynFlag Opt_D_dump_rn_trace) )
336 , ( "ddump-tc-trace", NoArg (setDynFlag Opt_D_dump_tc_trace) )
337 , ( "ddump-rn-stats", NoArg (setDynFlag Opt_D_dump_rn_stats) )
338 , ( "ddump-stix", NoArg (setDynFlag Opt_D_dump_stix) )
339 , ( "ddump-simpl-stats", NoArg (setDynFlag Opt_D_dump_simpl_stats) )
340 , ( "ddump-bcos", NoArg (setDynFlag Opt_D_dump_BCOs) )
341 , ( "dsource-stats", NoArg (setDynFlag Opt_D_source_stats) )
342 , ( "dverbose-core2core", NoArg (setDynFlag Opt_D_verbose_core2core) )
343 , ( "dverbose-stg2stg", NoArg (setDynFlag Opt_D_verbose_stg2stg) )
344 , ( "ddump-hi-diffs", NoArg (setDynFlag Opt_D_dump_hi_diffs) )
345 , ( "ddump-hi", NoArg (setDynFlag Opt_D_dump_hi) )
346 , ( "ddump-minimal-imports", NoArg (setDynFlag Opt_D_dump_minimal_imports) )
347 , ( "dcore-lint", NoArg (setDynFlag Opt_DoCoreLinting) )
348 , ( "dstg-lint", NoArg (setDynFlag Opt_DoStgLinting) )
349 , ( "dusagesp-lint", NoArg (setDynFlag Opt_DoUSPLinting) )
351 ------ Machine dependant (-m<blah>) stuff ---------------------------
353 , ( "monly-2-regs", NoArg (updDynFlags (\s -> s{stolen_x86_regs = 2}) ))
354 , ( "monly-3-regs", NoArg (updDynFlags (\s -> s{stolen_x86_regs = 3}) ))
355 , ( "monly-4-regs", NoArg (updDynFlags (\s -> s{stolen_x86_regs = 4}) ))
357 ------ Warning opts -------------------------------------------------
358 , ( "W" , NoArg (mapM_ setDynFlag minusWOpts) )
359 , ( "Wall" , NoArg (mapM_ setDynFlag minusWallOpts) )
360 , ( "Wnot" , NoArg (mapM_ unSetDynFlag minusWallOpts) ) /* DEPREC */
361 , ( "w" , NoArg (mapM_ unSetDynFlag minusWallOpts) )
363 ------ Compiler flags -----------------------------------------------
365 , ( "fasm", AnySuffix (\_ -> setLang HscAsm) )
366 , ( "fvia-c", NoArg (setLang HscC) )
367 , ( "fvia-C", NoArg (setLang HscC) )
368 , ( "filx", NoArg (setLang HscILX) )
370 -- "active negatives"
371 , ( "fno-implicit-prelude", NoArg (setDynFlag Opt_NoImplicitPrelude) )
373 -- the rest of the -f* and -fno-* flags
374 , ( "fno-", PrefixPred (\f -> isFFlag f) (\f -> unSetDynFlag (getFFlag f)) )
375 , ( "f", PrefixPred (\f -> isFFlag f) (\f -> setDynFlag (getFFlag f)) )
378 -- these -f<blah> flags can all be reversed with -fno-<blah>
381 ( "warn-duplicate-exports", Opt_WarnDuplicateExports ),
382 ( "warn-hi-shadowing", Opt_WarnHiShadows ),
383 ( "warn-incomplete-patterns", Opt_WarnIncompletePatterns ),
384 ( "warn-missing-fields", Opt_WarnMissingFields ),
385 ( "warn-missing-methods", Opt_WarnMissingMethods ),
386 ( "warn-missing-signatures", Opt_WarnMissingSigs ),
387 ( "warn-name-shadowing", Opt_WarnNameShadowing ),
388 ( "warn-overlapping-patterns", Opt_WarnOverlappingPatterns ),
389 ( "warn-simple-patterns", Opt_WarnSimplePatterns ),
390 ( "warn-type-defaults", Opt_WarnTypeDefaults ),
391 ( "warn-unused-binds", Opt_WarnUnusedBinds ),
392 ( "warn-unused-imports", Opt_WarnUnusedImports ),
393 ( "warn-unused-matches", Opt_WarnUnusedMatches ),
394 ( "warn-deprecations", Opt_WarnDeprecations ),
395 ( "glasgow-exts", Opt_GlasgowExts ),
396 ( "allow-overlapping-instances", Opt_AllowOverlappingInstances ),
397 ( "allow-undecidable-instances", Opt_AllowUndecidableInstances ),
398 ( "generics", Opt_Generics )
401 isFFlag f = f `elem` (map fst fFlags)
402 getFFlag f = fromJust (lookup f fFlags)
404 -----------------------------------------------------------------------------
405 -- convert sizes like "3.5M" into integers
407 decodeSize :: String -> Integer
409 | c == "" = truncate n
410 | c == "K" || c == "k" = truncate (n * 1000)
411 | c == "M" || c == "m" = truncate (n * 1000 * 1000)
412 | c == "G" || c == "g" = truncate (n * 1000 * 1000 * 1000)
413 | otherwise = throwDyn (CmdLineError ("can't decode size: " ++ str))
414 where (m, c) = span pred str
416 pred c = isDigit c || c == '.'
419 -----------------------------------------------------------------------------
422 foreign import "setHeapSize" unsafe setHeapSize :: Int -> IO ()
423 foreign import "enableTimingStats" unsafe enableTimingStats :: IO ()
425 -----------------------------------------------------------------------------
426 -- Build the Hsc static command line opts
428 buildStaticHscOpts :: IO [String]
429 buildStaticHscOpts = do
431 opt_C_ <- getStaticOpts v_Opt_C -- misc hsc opts from the command line
434 minus_o <- readIORef v_OptLevel
435 let optimisation_opts =
437 0 -> hsc_minusNoO_flags
438 1 -> hsc_minusO_flags
439 2 -> hsc_minusO2_flags
440 _ -> error "unknown opt level"
443 -- take into account -fno-* flags by removing the equivalent -f*
444 -- flag from our list.
445 anti_flags <- getStaticOpts v_Anti_opt_C
446 let basic_opts = opt_C_ ++ optimisation_opts
447 filtered_opts = filter (`notElem` anti_flags) basic_opts
449 static <- (do s <- readIORef v_Static; if s then return "-static"
452 return ( static : filtered_opts )
454 -----------------------------------------------------------------------------
455 -- Via-C compilation stuff
457 -- flags returned are: ( all C compilations
458 -- , registerised HC compilations
462 | prefixMatch "alpha" cTARGETPLATFORM
463 = return ( ["-static"], [] )
465 | prefixMatch "hppa" cTARGETPLATFORM
466 -- ___HPUX_SOURCE, not _HPUX_SOURCE, is #defined if -ansi!
467 -- (very nice, but too bad the HP /usr/include files don't agree.)
468 = return ( ["-static", "-D_HPUX_SOURCE"], [] )
470 | prefixMatch "m68k" cTARGETPLATFORM
471 -- -fno-defer-pop : for the .hc files, we want all the pushing/
472 -- popping of args to routines to be explicit; if we let things
473 -- be deferred 'til after an STGJUMP, imminent death is certain!
475 -- -fomit-frame-pointer : *don't*
476 -- It's better to have a6 completely tied up being a frame pointer
477 -- rather than let GCC pick random things to do with it.
478 -- (If we want to steal a6, then we would try to do things
479 -- as on iX86, where we *do* steal the frame pointer [%ebp].)
480 = return ( [], ["-fno-defer-pop", "-fno-omit-frame-pointer"] )
482 | prefixMatch "i386" cTARGETPLATFORM
483 -- -fno-defer-pop : basically the same game as for m68k
485 -- -fomit-frame-pointer : *must* in .hc files; because we're stealing
486 -- the fp (%ebp) for our register maps.
487 = do n_regs <- dynFlag stolen_x86_regs
488 sta <- readIORef v_Static
489 return ( [ if sta then "-DDONT_WANT_WIN32_DLL_SUPPORT" else "",
490 if suffixMatch "mingw32" cTARGETPLATFORM then "-mno-cygwin" else "" ],
491 [ "-fno-defer-pop", "-fomit-frame-pointer",
492 "-DSTOLEN_X86_REGS="++show n_regs ]
495 | prefixMatch "mips" cTARGETPLATFORM
496 = return ( ["static"], [] )
498 | prefixMatch "powerpc" cTARGETPLATFORM || prefixMatch "rs6000" cTARGETPLATFORM
499 = return ( ["static"], ["-finhibit-size-directive"] )
506 addOpt_L a = updDynFlags (\s -> s{opt_L = a : opt_L s})
507 addOpt_P a = updDynFlags (\s -> s{opt_P = a : opt_P s})
508 addOpt_c a = updDynFlags (\s -> s{opt_c = a : opt_c s})
509 addOpt_a a = updDynFlags (\s -> s{opt_a = a : opt_a s})
510 addOpt_m a = updDynFlags (\s -> s{opt_m = a : opt_m s})
512 addCmdlineHCInclude a = updDynFlags (\s -> s{cmdlineHcIncludes = a : cmdlineHcIncludes s})
514 getOpts :: (DynFlags -> [a]) -> IO [a]
515 -- We add to the options from the front, so we need to reverse the list
516 getOpts opts = dynFlag opts >>= return . reverse
518 -- we can only change HscC to HscAsm and vice-versa with dynamic flags
519 -- (-fvia-C and -fasm).
520 -- NB: we can also set the new lang to ILX, via -filx. I hope this is right
521 setLang l = updDynFlags (\ dfs -> case hscLang dfs of
522 HscC -> dfs{ hscLang = l }
523 HscAsm -> dfs{ hscLang = l }
524 HscILX -> dfs{ hscLang = l }
527 setVerbosity "" = updDynFlags (\dfs -> dfs{ verbosity = 3 })
529 | all isDigit n = updDynFlags (\dfs -> dfs{ verbosity = read n })
530 | otherwise = throwDyn (UsageError "can't parse verbosity flag (-v<n>)")
533 verb <- dynFlag verbosity
534 if verb >= 3 then return "-v" else return ""