Cabal submodule update.

There's a substantial bump to the haddock.Cabal allocation
stats, because we added 50% more modules, so of course allocations
are going to increase 50%. (But perhaps this is indicative of
some bad constant factor in Haddock related to modules.)

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Test Plan: validate

Reviewers: ggreif, austin, bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2442

1 files changed, 8 insertions, 4 deletions

diff --git a/utils/ghctags/Main.hs b/utils/ghctags/Main.hs
index 9a2ab2cccf..138687e5fa 100644
--- a/utils/ghctags/Main.hs
+++ b/utils/ghctags/Main.hs
@@ -23,6 +23,8 @@ import Distribution.Simple.Configure ( getPersistBuildConfig )
 import Distribution.Simple.Program.GHC ( renderGhcOptions )
 import Distribution.PackageDescription ( libBuildInfo )
 import Distribution.Simple.LocalBuildInfo
+import Distribution.Types.LocalBuildInfo ( componentNameTargets' )
+import Distribution.Types.TargetInfo
 import qualified Distribution.Verbosity as V
 
 import Control.Monad hiding (mapM)
@@ -179,14 +181,16 @@ flagsFromCabal :: FilePath -> IO [String]
 flagsFromCabal distPref = do
   lbi <- getPersistBuildConfig distPref
   let pd = localPkgDescr lbi
-  case maybeGetDefaultLibraryLocalBuildInfo lbi of
-    Just clbi ->
-      let CLib lib = getComponent pd (componentLocalName clbi)
+  case componentNameTargets' pd lbi CLibName of
+    [target] ->
+      let clbi = targetCLBI target
+          CLib lib = getComponent pd (componentLocalName clbi)
           bi = libBuildInfo lib
           odir = buildDir lbi
           opts = componentGhcOptions V.normal lbi bi clbi odir
       in return $ renderGhcOptions (compiler lbi) (hostPlatform lbi) opts
-    _ -> error "no library"
+    [] -> error "no library"
+    _ -> error "more libraries than we know how to handle"
 
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