Revert "In ghci linker, link against all previous temp sos (#10322)"

This reverts commit b0b11ad9.

It apparently made Harbormaster sad.

compiler/ghci/Linker.hs

@@ -119,9 +119,9 @@ data PersistentLinkerState
         -- that is really important
         pkgs_loaded :: ![PackageKey],
 
-        -- we need to remember the name of previous temporary DLL/.so
-        -- libraries so we can link them (see #10322)
-        temp_sos :: ![(FilePath, String)] }
+        -- we need to remember the name of the last temporary DLL/.so
+        -- so we can link it
+        last_temp_so :: !(Maybe (FilePath, String)) }
 
 
 emptyPLS :: DynFlags -> PersistentLinkerState
@@ -131,7 +131,7 @@ emptyPLS _ = PersistentLinkerState {
                         pkgs_loaded = init_pkgs,
                         bcos_loaded = [],
                         objs_loaded = [],
-                        temp_sos = [] }
+                        last_temp_so = Nothing }
 
   -- Packages that don't need loading, because the compiler
   -- shares them with the interpreted program.
@@ -841,19 +841,19 @@ dynLoadObjs dflags pls objs = do
         dflags2 = dflags1 {
                       -- We don't want the original ldInputs in
                       -- (they're already linked in), but we do want
-                      -- to link against previous dynLoadObjs
-                      -- libraries if there were any, so that the linker
+                      -- to link against the previous dynLoadObjs
+                      -- library if there was one, so that the linker
                       -- can resolve dependencies when it loads this
                       -- library.
                       ldInputs =
-                        concatMap
-                            (\(lp, l) ->
+                        case last_temp_so pls of
+                          Nothing -> []
+                          Just (lp, l)  ->
                                  [ Option ("-L" ++ lp)
                                  , Option ("-Wl,-rpath")
                                  , Option ("-Wl," ++ lp)
                                  , Option ("-l" ++  l)
-                                 ])
-                            (temp_sos pls),
+                                 ],
                       -- Even if we're e.g. profiling, we still want
                       -- the vanilla dynamic libraries, so we set the
                       -- ways / build tag to be just WayDyn.
@@ -868,7 +868,7 @@ dynLoadObjs dflags pls objs = do
     consIORef (filesToNotIntermediateClean dflags) soFile
     m <- loadDLL soFile
     case m of
-        Nothing -> return pls { temp_sos = (libPath, libName) : temp_sos pls }
+        Nothing -> return pls { last_temp_so = Just (libPath, libName) }
         Just err -> panic ("Loading temp shared object failed: " ++ err)
 
 rmDupLinkables :: [Linkable]    -- Already loaded

testsuite/tests/ghci/scripts/all.T

@@ -218,4 +218,3 @@ test('T10408B', normal, run_command,
     ['$MAKE -s --no-print-directory T10408B'])
 test('T10248', normal, ghci_script, ['T10248.script'])
 test('T10110', normal, ghci_script, ['T10110.script'])
-test('T10322', normal, ghci_script, ['T10322.script'])