1 {-# OPTIONS -#include "hschooks.h" #-}
3 -----------------------------------------------------------------------------
4 -- $Id: DriverFlags.hs,v 1.59 2001/06/15 08:29:58 simonpj Exp $
8 -- (c) Simon Marlow 2000
10 -----------------------------------------------------------------------------
13 processArgs, OptKind(..), static_flags, dynamic_flags,
15 getOpts, getVerbFlag, addCmdlineHCInclude,
20 #include "HsVersions.h"
21 #include "../includes/config.h"
25 import SysTools ( setTmpDir, setPgm, setDryRun, showGhcUsage )
33 import System ( exitWith, ExitCode(..) )
40 -----------------------------------------------------------------------------
43 -- Flag parsing is now done in stages:
45 -- * parse the initial list of flags and remove any flags understood
46 -- by the driver only. Determine whether we're in multi-compilation
47 -- or single-compilation mode (done in Main.main).
49 -- * gather the list of "static" hsc flags, and assign them to the global
50 -- static hsc flags variable.
52 -- * build the inital DynFlags from the remaining flags.
54 -- * complain if we've got any flags left over.
56 -- * for each source file: grab the OPTIONS, and build a new DynFlags
57 -- to pass to the compiler.
59 -----------------------------------------------------------------------------
60 -- Process command-line
63 = NoArg (IO ()) -- flag with no argument
64 | HasArg (String -> IO ()) -- flag has an argument (maybe prefix)
65 | SepArg (String -> IO ()) -- flag has a separate argument
66 | Prefix (String -> IO ()) -- flag is a prefix only
67 | OptPrefix (String -> IO ()) -- flag may be a prefix
68 | AnySuffix (String -> IO ()) -- flag is a prefix, pass whole arg to fn
69 | PassFlag (String -> IO ()) -- flag with no arg, pass flag to fn
70 | PrefixPred (String -> Bool) (String -> IO ())
71 | AnySuffixPred (String -> Bool) (String -> IO ())
73 processArgs :: [(String,OptKind)] -> [String] -> [String]
74 -> IO [String] -- returns spare args
75 processArgs _spec [] spare = return (reverse spare)
77 processArgs spec args@(('-':arg):args') spare = do
78 case findArg spec arg of
79 Just (rest,action) -> do args' <- processOneArg action rest args
80 processArgs spec args' spare
81 Nothing -> processArgs spec args' (('-':arg):spare)
83 processArgs spec (arg:args) spare =
84 processArgs spec args (arg:spare)
86 processOneArg :: OptKind -> String -> [String] -> IO [String]
87 processOneArg action rest (dash_arg@('-':arg):args) =
91 then io >> return args
92 else unknownFlagErr dash_arg
96 then fio rest >> return args
98 [] -> unknownFlagErr dash_arg
99 (arg1:args1) -> fio arg1 >> return args1
103 [] -> unknownFlagErr dash_arg
104 (arg1:args1) -> fio arg1 >> return args1
108 then fio rest >> return args
109 else unknownFlagErr dash_arg
113 then fio rest >> return args
114 else unknownFlagErr dash_arg
116 OptPrefix fio -> fio rest >> return args
118 AnySuffix fio -> fio dash_arg >> return args
120 AnySuffixPred p fio -> fio dash_arg >> return args
124 then unknownFlagErr dash_arg
125 else fio dash_arg >> return args
127 findArg :: [(String,OptKind)] -> String -> Maybe (String,OptKind)
129 = case [ (remove_spaces rest, k)
131 Just rest <- [my_prefix_match pat arg],
137 arg_ok (NoArg _) rest arg = null rest
138 arg_ok (HasArg _) rest arg = True
139 arg_ok (SepArg _) rest arg = null rest
140 arg_ok (Prefix _) rest arg = not (null rest)
141 arg_ok (PrefixPred p _) rest arg = not (null rest) && p rest
142 arg_ok (OptPrefix _) rest arg = True
143 arg_ok (PassFlag _) rest arg = null rest
144 arg_ok (AnySuffix _) rest arg = True
145 arg_ok (AnySuffixPred p _) rest arg = p arg
147 -----------------------------------------------------------------------------
150 -- note that ordering is important in the following list: any flag which
151 -- is a prefix flag (i.e. HasArg, Prefix, OptPrefix, AnySuffix) will override
152 -- flags further down the list with the same prefix.
155 [ ------- help -------------------------------------------------------
156 ( "?" , NoArg showGhcUsage)
157 , ( "-help" , NoArg showGhcUsage)
160 ------- version ----------------------------------------------------
161 , ( "-version" , NoArg (do hPutStrLn stdout (cProjectName
162 ++ ", version " ++ cProjectVersion)
163 exitWith ExitSuccess))
164 , ( "-numeric-version", NoArg (do hPutStrLn stdout cProjectVersion
165 exitWith ExitSuccess))
167 ------- verbosity ----------------------------------------------------
168 , ( "n" , NoArg setDryRun )
170 ------- recompilation checker --------------------------------------
171 , ( "recomp" , NoArg (writeIORef v_Recomp True) )
172 , ( "no-recomp" , NoArg (writeIORef v_Recomp False) )
174 ------- ways --------------------------------------------------------
175 , ( "prof" , NoArg (addNoDups v_Ways WayProf) )
176 , ( "unreg" , NoArg (addNoDups v_Ways WayUnreg) )
177 , ( "ticky" , NoArg (addNoDups v_Ways WayTicky) )
178 , ( "parallel" , NoArg (addNoDups v_Ways WayPar) )
179 , ( "gransim" , NoArg (addNoDups v_Ways WayGran) )
180 , ( "smp" , NoArg (addNoDups v_Ways WaySMP) )
181 , ( "debug" , NoArg (addNoDups v_Ways WayDebug) )
184 ------ Debugging ----------------------------------------------------
185 , ( "dppr-noprags", PassFlag (add v_Opt_C) )
186 , ( "dppr-debug", PassFlag (add v_Opt_C) )
187 , ( "dppr-user-length", AnySuffix (add v_Opt_C) )
188 -- rest of the debugging flags are dynamic
190 --------- Profiling --------------------------------------------------
191 , ( "auto-dicts" , NoArg (add v_Opt_C "-fauto-sccs-on-dicts") )
192 , ( "auto-all" , NoArg (add v_Opt_C "-fauto-sccs-on-all-toplevs") )
193 , ( "auto" , NoArg (add v_Opt_C "-fauto-sccs-on-exported-toplevs") )
194 , ( "caf-all" , NoArg (add v_Opt_C "-fauto-sccs-on-individual-cafs") )
195 -- "ignore-sccs" doesn't work (ToDo)
197 , ( "no-auto-dicts" , NoArg (add v_Anti_opt_C "-fauto-sccs-on-dicts") )
198 , ( "no-auto-all" , NoArg (add v_Anti_opt_C "-fauto-sccs-on-all-toplevs") )
199 , ( "no-auto" , NoArg (add v_Anti_opt_C "-fauto-sccs-on-exported-toplevs") )
200 , ( "no-caf-all" , NoArg (add v_Anti_opt_C "-fauto-sccs-on-individual-cafs") )
202 ------- Miscellaneous -----------------------------------------------
203 , ( "no-link-chk" , NoArg (return ()) ) -- ignored for backwards compat
204 , ( "no-hs-main" , NoArg (writeIORef v_NoHsMain True) )
206 ------- Output Redirection ------------------------------------------
207 , ( "odir" , HasArg (writeIORef v_Output_dir . Just) )
208 , ( "o" , SepArg (writeIORef v_Output_file . Just) )
209 , ( "osuf" , HasArg (writeIORef v_Object_suf . Just) )
210 , ( "hcsuf" , HasArg (writeIORef v_HC_suf . Just) )
211 , ( "hisuf" , HasArg (writeIORef v_Hi_suf) )
212 , ( "hidir" , HasArg (writeIORef v_Hi_dir . Just) )
213 , ( "buildtag" , HasArg (writeIORef v_Build_tag) )
214 , ( "tmpdir" , HasArg setTmpDir)
215 , ( "ohi" , HasArg (writeIORef v_Output_hi . Just) )
218 , ( "keep-hc-file" , AnySuffix (\_ -> writeIORef v_Keep_hc_files True) )
219 , ( "keep-s-file" , AnySuffix (\_ -> writeIORef v_Keep_s_files True) )
220 , ( "keep-raw-s-file", AnySuffix (\_ -> writeIORef v_Keep_raw_s_files True) )
221 , ( "keep-tmp-files" , AnySuffix (\_ -> writeIORef v_Keep_tmp_files True) )
223 , ( "split-objs" , NoArg (if can_split
224 then do writeIORef v_Split_object_files True
225 add v_Opt_C "-fglobalise-toplev-names"
226 else hPutStrLn stderr
227 "warning: don't know how to split \
228 \object files on this architecture"
231 ------- Include/Import Paths ----------------------------------------
232 , ( "i" , OptPrefix (addToDirList v_Import_paths) )
233 , ( "I" , Prefix (addToDirList v_Include_paths) )
235 ------- Libraries ---------------------------------------------------
236 , ( "L" , Prefix (addToDirList v_Library_paths) )
237 , ( "l" , Prefix (add v_Cmdline_libraries) )
239 ------- Packages ----------------------------------------------------
240 , ( "package-name" , HasArg (\s -> add v_Opt_C ("-inpackage="++s)) )
242 , ( "package" , HasArg (addPackage) )
243 , ( "syslib" , HasArg (addPackage) ) -- for compatibility w/ old vsns
245 ------- Specific phases --------------------------------------------
246 , ( "pgm" , HasArg setPgm )
248 , ( "optdep" , HasArg (add v_Opt_dep) )
249 , ( "optl" , HasArg (add v_Opt_l) )
250 , ( "optdll" , HasArg (add v_Opt_dll) )
252 ----- Linker --------------------------------------------------------
253 , ( "static" , NoArg (writeIORef v_Static True) )
254 , ( "dynamic" , NoArg (writeIORef v_Static False) )
255 , ( "rdynamic" , NoArg (return ()) ) -- ignored for compat w/ gcc
257 ----- RTS opts ------------------------------------------------------
258 , ( "H" , HasArg (setHeapSize . fromIntegral . decodeSize) )
259 , ( "Rghc-timing" , NoArg (enableTimingStats) )
261 ------ Compiler flags -----------------------------------------------
262 , ( "O2-for-C" , NoArg (writeIORef v_minus_o2_for_C True) )
263 , ( "O" , OptPrefix (setOptLevel) )
265 , ( "fno-asm-mangling" , NoArg (writeIORef v_Do_asm_mangling False) )
267 , ( "fmax-simplifier-iterations",
268 Prefix (writeIORef v_MaxSimplifierIterations . read) )
270 , ( "fusagesp" , NoArg (do writeIORef v_UsageSPInf True
271 add v_Opt_C "-fusagesp-on") )
273 , ( "fexcess-precision" , NoArg (do writeIORef v_Excess_precision True
274 add v_Opt_C "-fexcess-precision"))
276 -- Optimisation flags are treated specially, so the normal
277 -- -fno-* pattern below doesn't work. We therefore allow
278 -- certain optimisation passes to be turned off explicitly:
279 , ( "fno-strictness" , NoArg (writeIORef v_Strictness False) )
280 , ( "fno-cpr" , NoArg (writeIORef v_CPR False) )
281 , ( "fno-cse" , NoArg (writeIORef v_CSE False) )
283 -- All other "-fno-<blah>" options cancel out "-f<blah>" on the hsc cmdline
284 , ( "fno-", PrefixPred (\s -> isStaticHscFlag ("f"++s))
285 (\s -> add v_Anti_opt_C ("-f"++s)) )
287 -- Pass all remaining "-f<blah>" options to hsc
288 , ( "f", AnySuffixPred (isStaticHscFlag) (add v_Opt_C) )
293 ( "cpp", NoArg (updDynFlags (\s -> s{ cppFlag = True })) )
294 , ( "#include", HasArg (addCmdlineHCInclude) )
296 , ( "v", OptPrefix (setVerbosity) )
298 , ( "optL", HasArg (addOpt_L) )
299 , ( "optP", HasArg (addOpt_P) )
300 , ( "optc", HasArg (addOpt_c) )
301 , ( "optm", HasArg (addOpt_m) )
302 , ( "opta", HasArg (addOpt_a) )
304 ------ HsCpp opts ---------------------------------------------------
305 , ( "D", Prefix (\s -> addOpt_P ("-D'"++s++"'") ) )
306 , ( "U", Prefix (\s -> addOpt_P ("-U'"++s++"'") ) )
308 ------ Debugging ----------------------------------------------------
309 , ( "dstg-stats", NoArg (writeIORef v_StgStats True) )
311 , ( "ddump-absC", NoArg (setDynFlag Opt_D_dump_absC) )
312 , ( "ddump-asm", NoArg (setDynFlag Opt_D_dump_asm) )
313 , ( "ddump-cpranal", NoArg (setDynFlag Opt_D_dump_cpranal) )
314 , ( "ddump-deriv", NoArg (setDynFlag Opt_D_dump_deriv) )
315 , ( "ddump-ds", NoArg (setDynFlag Opt_D_dump_ds) )
316 , ( "ddump-flatC", NoArg (setDynFlag Opt_D_dump_flatC) )
317 , ( "ddump-foreign", NoArg (setDynFlag Opt_D_dump_foreign) )
318 , ( "ddump-inlinings", NoArg (setDynFlag Opt_D_dump_inlinings) )
319 , ( "ddump-occur-anal", NoArg (setDynFlag Opt_D_dump_occur_anal) )
320 , ( "ddump-parsed", NoArg (setDynFlag Opt_D_dump_parsed) )
321 , ( "ddump-realC", NoArg (setDynFlag Opt_D_dump_realC) )
322 , ( "ddump-rn", NoArg (setDynFlag Opt_D_dump_rn) )
323 , ( "ddump-simpl", NoArg (setDynFlag Opt_D_dump_simpl) )
324 , ( "ddump-simpl-iterations", NoArg (setDynFlag Opt_D_dump_simpl_iterations) )
325 , ( "ddump-spec", NoArg (setDynFlag Opt_D_dump_spec) )
326 , ( "ddump-sat", NoArg (setDynFlag Opt_D_dump_sat) )
327 , ( "ddump-stg", NoArg (setDynFlag Opt_D_dump_stg) )
328 , ( "ddump-stranal", NoArg (setDynFlag Opt_D_dump_stranal) )
329 , ( "ddump-tc", NoArg (setDynFlag Opt_D_dump_tc) )
330 , ( "ddump-types", NoArg (setDynFlag Opt_D_dump_types) )
331 , ( "ddump-rules", NoArg (setDynFlag Opt_D_dump_rules) )
332 , ( "ddump-usagesp", NoArg (setDynFlag Opt_D_dump_usagesp) )
333 , ( "ddump-cse", NoArg (setDynFlag Opt_D_dump_cse) )
334 , ( "ddump-worker-wrapper", NoArg (setDynFlag Opt_D_dump_worker_wrapper) )
335 , ( "dshow-passes", NoArg (setVerbosity "2") )
336 , ( "ddump-rn-trace", NoArg (setDynFlag Opt_D_dump_rn_trace) )
337 , ( "ddump-tc-trace", NoArg (setDynFlag Opt_D_dump_tc_trace) )
338 , ( "ddump-rn-stats", NoArg (setDynFlag Opt_D_dump_rn_stats) )
339 , ( "ddump-stix", NoArg (setDynFlag Opt_D_dump_stix) )
340 , ( "ddump-simpl-stats", NoArg (setDynFlag Opt_D_dump_simpl_stats) )
341 , ( "ddump-bcos", NoArg (setDynFlag Opt_D_dump_BCOs) )
342 , ( "dsource-stats", NoArg (setDynFlag Opt_D_source_stats) )
343 , ( "dverbose-core2core", NoArg (setDynFlag Opt_D_verbose_core2core) )
344 , ( "dverbose-stg2stg", NoArg (setDynFlag Opt_D_verbose_stg2stg) )
345 , ( "ddump-hi-diffs", NoArg (setDynFlag Opt_D_dump_hi_diffs) )
346 , ( "ddump-hi", NoArg (setDynFlag Opt_D_dump_hi) )
347 , ( "ddump-minimal-imports", NoArg (setDynFlag Opt_D_dump_minimal_imports) )
348 , ( "dcore-lint", NoArg (setDynFlag Opt_DoCoreLinting) )
349 , ( "dstg-lint", NoArg (setDynFlag Opt_DoStgLinting) )
350 , ( "dusagesp-lint", NoArg (setDynFlag Opt_DoUSPLinting) )
352 ------ Machine dependant (-m<blah>) stuff ---------------------------
354 , ( "monly-2-regs", NoArg (updDynFlags (\s -> s{stolen_x86_regs = 2}) ))
355 , ( "monly-3-regs", NoArg (updDynFlags (\s -> s{stolen_x86_regs = 3}) ))
356 , ( "monly-4-regs", NoArg (updDynFlags (\s -> s{stolen_x86_regs = 4}) ))
358 ------ Warning opts -------------------------------------------------
359 , ( "W" , NoArg (mapM_ setDynFlag minusWOpts) )
360 , ( "Wall" , NoArg (mapM_ setDynFlag minusWallOpts) )
361 , ( "Wnot" , NoArg (mapM_ unSetDynFlag minusWallOpts) ) /* DEPREC */
362 , ( "w" , NoArg (mapM_ unSetDynFlag minusWallOpts) )
364 ------ Compiler flags -----------------------------------------------
366 , ( "fasm", AnySuffix (\_ -> setLang HscAsm) )
367 , ( "fvia-c", NoArg (setLang HscC) )
368 , ( "fvia-C", NoArg (setLang HscC) )
369 , ( "filx", NoArg (setLang HscILX) )
371 -- "active negatives"
372 , ( "fno-implicit-prelude", NoArg (setDynFlag Opt_NoImplicitPrelude) )
374 -- the rest of the -f* and -fno-* flags
375 , ( "fno-", PrefixPred (\f -> isFFlag f) (\f -> unSetDynFlag (getFFlag f)) )
376 , ( "f", PrefixPred (\f -> isFFlag f) (\f -> setDynFlag (getFFlag f)) )
379 -- these -f<blah> flags can all be reversed with -fno-<blah>
382 ( "warn-duplicate-exports", Opt_WarnDuplicateExports ),
383 ( "warn-hi-shadowing", Opt_WarnHiShadows ),
384 ( "warn-incomplete-patterns", Opt_WarnIncompletePatterns ),
385 ( "warn-missing-fields", Opt_WarnMissingFields ),
386 ( "warn-missing-methods", Opt_WarnMissingMethods ),
387 ( "warn-missing-signatures", Opt_WarnMissingSigs ),
388 ( "warn-name-shadowing", Opt_WarnNameShadowing ),
389 ( "warn-overlapping-patterns", Opt_WarnOverlappingPatterns ),
390 ( "warn-simple-patterns", Opt_WarnSimplePatterns ),
391 ( "warn-type-defaults", Opt_WarnTypeDefaults ),
392 ( "warn-unused-binds", Opt_WarnUnusedBinds ),
393 ( "warn-unused-imports", Opt_WarnUnusedImports ),
394 ( "warn-unused-matches", Opt_WarnUnusedMatches ),
395 ( "warn-deprecations", Opt_WarnDeprecations ),
396 ( "glasgow-exts", Opt_GlasgowExts ),
397 ( "allow-overlapping-instances", Opt_AllowOverlappingInstances ),
398 ( "allow-undecidable-instances", Opt_AllowUndecidableInstances ),
399 ( "generics", Opt_Generics )
402 isFFlag f = f `elem` (map fst fFlags)
403 getFFlag f = fromJust (lookup f fFlags)
405 -----------------------------------------------------------------------------
406 -- convert sizes like "3.5M" into integers
408 decodeSize :: String -> Integer
410 | c == "" = truncate n
411 | c == "K" || c == "k" = truncate (n * 1000)
412 | c == "M" || c == "m" = truncate (n * 1000 * 1000)
413 | c == "G" || c == "g" = truncate (n * 1000 * 1000 * 1000)
414 | otherwise = throwDyn (CmdLineError ("can't decode size: " ++ str))
415 where (m, c) = span pred str
417 pred c = isDigit c || c == '.'
420 -----------------------------------------------------------------------------
423 foreign import "setHeapSize" unsafe setHeapSize :: Int -> IO ()
424 foreign import "enableTimingStats" unsafe enableTimingStats :: IO ()
426 -----------------------------------------------------------------------------
427 -- Build the Hsc static command line opts
429 buildStaticHscOpts :: IO [String]
430 buildStaticHscOpts = do
432 opt_C_ <- getStaticOpts v_Opt_C -- misc hsc opts from the command line
435 minus_o <- readIORef v_OptLevel
436 let optimisation_opts =
438 0 -> hsc_minusNoO_flags
439 1 -> hsc_minusO_flags
440 2 -> hsc_minusO2_flags
441 _ -> error "unknown opt level"
444 -- take into account -fno-* flags by removing the equivalent -f*
445 -- flag from our list.
446 anti_flags <- getStaticOpts v_Anti_opt_C
447 let basic_opts = opt_C_ ++ optimisation_opts
448 filtered_opts = filter (`notElem` anti_flags) basic_opts
450 static <- (do s <- readIORef v_Static; if s then return "-static"
453 return ( static : filtered_opts )
455 -----------------------------------------------------------------------------
456 -- Via-C compilation stuff
458 -- flags returned are: ( all C compilations
459 -- , registerised HC compilations
463 | prefixMatch "alpha" cTARGETPLATFORM
464 = return ( ["-static"], [] )
466 | prefixMatch "hppa" cTARGETPLATFORM
467 -- ___HPUX_SOURCE, not _HPUX_SOURCE, is #defined if -ansi!
468 -- (very nice, but too bad the HP /usr/include files don't agree.)
469 = return ( ["-static", "-D_HPUX_SOURCE"], [] )
471 | prefixMatch "m68k" cTARGETPLATFORM
472 -- -fno-defer-pop : for the .hc files, we want all the pushing/
473 -- popping of args to routines to be explicit; if we let things
474 -- be deferred 'til after an STGJUMP, imminent death is certain!
476 -- -fomit-frame-pointer : *don't*
477 -- It's better to have a6 completely tied up being a frame pointer
478 -- rather than let GCC pick random things to do with it.
479 -- (If we want to steal a6, then we would try to do things
480 -- as on iX86, where we *do* steal the frame pointer [%ebp].)
481 = return ( [], ["-fno-defer-pop", "-fno-omit-frame-pointer"] )
483 | prefixMatch "i386" cTARGETPLATFORM
484 -- -fno-defer-pop : basically the same game as for m68k
486 -- -fomit-frame-pointer : *must* in .hc files; because we're stealing
487 -- the fp (%ebp) for our register maps.
488 = do n_regs <- dynFlag stolen_x86_regs
489 sta <- readIORef v_Static
490 return ( [ if sta then "-DDONT_WANT_WIN32_DLL_SUPPORT" else "",
491 if suffixMatch "mingw32" cTARGETPLATFORM then "-mno-cygwin" else "" ],
492 [ "-fno-defer-pop", "-fomit-frame-pointer",
493 "-DSTOLEN_X86_REGS="++show n_regs ]
496 | prefixMatch "mips" cTARGETPLATFORM
497 = return ( ["static"], [] )
499 | prefixMatch "powerpc" cTARGETPLATFORM || prefixMatch "rs6000" cTARGETPLATFORM
500 = return ( ["static"], ["-finhibit-size-directive"] )
507 addOpt_L a = updDynFlags (\s -> s{opt_L = a : opt_L s})
508 addOpt_P a = updDynFlags (\s -> s{opt_P = a : opt_P s})
509 addOpt_c a = updDynFlags (\s -> s{opt_c = a : opt_c s})
510 addOpt_a a = updDynFlags (\s -> s{opt_a = a : opt_a s})
511 addOpt_m a = updDynFlags (\s -> s{opt_m = a : opt_m s})
513 addCmdlineHCInclude a = updDynFlags (\s -> s{cmdlineHcIncludes = a : cmdlineHcIncludes s})
515 getOpts :: (DynFlags -> [a]) -> IO [a]
516 -- We add to the options from the front, so we need to reverse the list
517 getOpts opts = dynFlag opts >>= return . reverse
519 -- we can only change HscC to HscAsm and vice-versa with dynamic flags
520 -- (-fvia-C and -fasm).
521 -- NB: we can also set the new lang to ILX, via -filx. I hope this is right
522 setLang l = updDynFlags (\ dfs -> case hscLang dfs of
523 HscC -> dfs{ hscLang = l }
524 HscAsm -> dfs{ hscLang = l }
525 HscILX -> dfs{ hscLang = l }
528 setVerbosity "" = updDynFlags (\dfs -> dfs{ verbosity = 3 })
530 | all isDigit n = updDynFlags (\dfs -> dfs{ verbosity = read n })
531 | otherwise = throwDyn (UsageError "can't parse verbosity flag (-v<n>)")
534 verb <- dynFlag verbosity
535 if verb >= 3 then return "-v" else return ""