Merge pull request #3671 from ezyang/pr/handle-v0

Pass on -v0 to GHC.

Author: ezyang

Cabal/Distribution/Simple/GHC/Internal.hs

@@ -241,10 +241,11 @@ componentCcGhcOptions :: Verbosity -> GhcImplInfo -> LocalBuildInfo
                       -> BuildInfo -> ComponentLocalBuildInfo
                       -> FilePath -> FilePath
                       -> GhcOptions
-componentCcGhcOptions _verbosity _implInfo lbi bi clbi odir filename =
+componentCcGhcOptions verbosity _implInfo lbi bi clbi odir filename =
     mempty {
-      -- Use --ghc-option=-v instead!
-      ghcOptVerbosity      = NoFlag,
+      -- Respect -v0, but don't crank up verbosity on GHC if
+      -- Cabal verbosity is requested. For that, use --ghc-option=-v instead!
+      ghcOptVerbosity      = toFlag (min verbosity normal),
       ghcOptMode           = toFlag GhcModeCompile,
       ghcOptInputFiles     = toNubListR [filename],
 
@@ -270,10 +271,11 @@ componentCcGhcOptions _verbosity _implInfo lbi bi clbi odir filename =
 componentGhcOptions :: Verbosity -> LocalBuildInfo
                     -> BuildInfo -> ComponentLocalBuildInfo -> FilePath
                     -> GhcOptions
-componentGhcOptions _verbosity lbi bi clbi odir =
+componentGhcOptions verbosity lbi bi clbi odir =
     mempty {
-      -- Use --ghc-option=-v instead!
-      ghcOptVerbosity       = NoFlag,
+      -- Respect -v0, but don't crank up verbosity on GHC if
+      -- Cabal verbosity is requested. For that, use --ghc-option=-v instead!
+      ghcOptVerbosity       = toFlag (min verbosity normal),
       ghcOptHideAllPackages = toFlag True,
       ghcOptCabal           = toFlag True,
       ghcOptThisUnitId      = case clbi of

cabal-install/Distribution/Client/SetupWrapper.hs

@@ -91,7 +91,7 @@ import Distribution.Text
 import Distribution.Utils.NubList
          ( toNubListR )
 import Distribution.Verbosity
-         ( Verbosity )
+         ( Verbosity, normal )
 import Distribution.Compat.Exception
          ( catchIO )
 
@@ -624,8 +624,9 @@ externalSetupMethod verbosity options pkg bt mkargs = do
           addRenaming (ipid, _) = (ipid, defaultRenaming)
           cppMacrosFile = setupDir </> "setup_macros.h"
           ghcOptions = mempty {
-              -- Use --ghc-option=-v instead!
-              ghcOptVerbosity       = NoFlag
+              -- Respect -v0, but don't crank up verbosity on GHC if
+              -- Cabal verbosity is requested. For that, use --ghc-option=-v instead!
+              ghcOptVerbosity       = Flag (min verbosity normal)
             , ghcOptMode            = Flag GhcModeMake
             , ghcOptInputFiles      = toNubListR [setupHs]
             , ghcOptOutputFile      = Flag setupProgFile