Major patch to fix reporting of unused imports

[ghc-hetmet.git] / compiler / main / Packages.lhs

diff --git a/compiler/main/Packages.lhs b/compiler/main/Packages.lhs
index 3e2c3ef..505a797 100644 (file)
--- a/compiler/main/Packages.lhs
+++ b/compiler/main/Packages.lhs
@@ -26,6 +26,7 @@ module Packages (
        getPreloadPackagesAnd,
 
         collectIncludeDirs, collectLibraryPaths, collectLinkOpts,
+        packageHsLibs,
 
        -- * Utils
        isDllName
@@ -49,9 +50,7 @@ import Outputable
 
 import System.Environment ( getEnv )
 import Distribution.InstalledPackageInfo hiding (depends)
-import Distribution.Package hiding (depends)
-import Distribution.Text
-import Distribution.Version
+import Distribution.Package hiding (depends, PackageId)
 import FastString
 import ErrUtils         ( debugTraceMsg, putMsg, Message )
 import Exception
@@ -391,8 +390,7 @@ findWiredInPackages dflags pkgs preload this_package = do
                             (haskell98PackageId, [""]),
                             (thPackageId, [""]),
                             (dphSeqPackageId, [""]),
-                            (dphParPackageId, [""]),
-                            (ndpPackageId, ["-seq", "-par"]) ]
+                            (dphParPackageId, [""])]
 
         matches :: PackageConfig -> (PackageId, [String]) -> Bool
         pc `matches` (pid, suffixes)
@@ -413,11 +411,9 @@ findWiredInPackages dflags pkgs preload this_package = do
                           -> IO (Maybe (PackageIdentifier, PackageId))
        findWiredInPackage pkgs wired_pkg =
            let all_ps = [ p | p <- pkgs, p `matches` wired_pkg ] in
-          case filter exposed all_ps of
-               [] -> case all_ps of
-                        []   -> notfound
-                        many -> pick (head (sortByVersion many))
-               many  -> pick (head (sortByVersion many))
+          case all_ps of
+               []   -> notfound
+               many -> pick (head (sortByVersion many))
           where
                 suffixes = snd wired_pkg
                 notfound = do
@@ -444,9 +440,18 @@ findWiredInPackages dflags pkgs preload this_package = do
   let 
         wired_in_ids = catMaybes mb_wired_in_ids
 
-       deleteOtherWiredInPackages pkgs = filterOut bad pkgs
-         where bad p = any (p `matches`) wired_in_pkgids
-                     && package p `notElem` map fst wired_in_ids
+        -- this is old: we used to assume that if there were
+        -- multiple versions of wired-in packages installed that
+        -- they were mutually exclusive.  Now we're assuming that
+        -- you have one "main" version of each wired-in package
+        -- (the latest version), and the others are backward-compat
+        -- wrappers that depend on this one.  e.g. base-4.0 is the
+        -- latest, base-3.0 is a compat wrapper depending on base-4.0.
+        {-
+       deleteOtherWiredInPackages pkgs = filterOut bad pkgs
+         where bad p = any (p `matches`) wired_in_pkgids
+                      && package p `notElem` map fst wired_in_ids
+        -}
 
        updateWiredInDependencies pkgs = map upd_pkg pkgs
          where upd_pkg p = p{ package = upd_pid (package p),
@@ -457,9 +462,9 @@ findWiredInPackages dflags pkgs preload this_package = do
                                ((x, y):_) -> x{ pkgName = PackageName (packageIdString y),
                                                  pkgVersion = Version [] [] }
 
-        pkgs1 = deleteOtherWiredInPackages pkgs
+        -- pkgs1 = deleteOtherWiredInPackages pkgs
 
-        pkgs2 = updateWiredInDependencies pkgs1
+        pkgs2 = updateWiredInDependencies pkgs
 
         preload1 = map upd_pid preload
 
@@ -633,14 +638,17 @@ getPackageLinkOpts dflags pkgs =
 collectLinkOpts :: DynFlags -> [PackageConfig] -> [String]
 collectLinkOpts dflags ps = concat (map all_opts ps)
   where
+       libs p     = packageHsLibs dflags p ++ extraLibraries p
+       all_opts p = map ("-l" ++) (libs p) ++ ldOptions p
+
+packageHsLibs :: DynFlags -> PackageConfig -> [String]
+packageHsLibs dflags p = map (mkDynName . addSuffix) (hsLibraries p)
+  where
         tag = buildTag dflags
         rts_tag = rtsBuildTag dflags
 
        mkDynName | opt_Static = id
                  | otherwise = (++ ("-ghc" ++ cProjectVersion))
-       libs p     = map (mkDynName . addSuffix) (hsLibraries p)
-                        ++ extraLibraries p
-       all_opts p = map ("-l" ++) (libs p) ++ ldOptions p
 
         addSuffix rts@"HSrts"    = rts       ++ (expandTag rts_tag)
         addSuffix other_lib      = other_lib ++ (expandTag tag)