Set LD=ld.bfd on Alpine linux during bindist configure

lib/GHCup/GHC.hs

@@ -449,13 +449,30 @@ installUnpackedGHC path inst tver forceInstall addConfArgs
            = []
 
       lift $ logInfo "Installing GHC (this may take a while)"
+      env <- case _rPlatform of
+               -- https://github.com/haskell/ghcup-hs/issues/967
+               Linux Alpine
+                 -- lets not touch LD for cross targets
+                 | Nothing <- _tvTarget tver -> do
+                     cEnv <- liftIO getEnvironment
+                     spaths <- liftIO getSearchPath
+                     has_ld_bfd <- isJust <$> liftIO (searchPath spaths "ld.bfd")
+                     let ldSet = isJust $ lookup "LD" cEnv
+                     -- only set LD if ld.bfd exists in PATH and LD is not set
+                     -- already
+                     if has_ld_bfd && not ldSet
+                     then do
+                       lift $ logInfo "Detected alpine linux... setting LD=ld.bfd"
+                       pure $ Just (("LD", "ld.bfd") : cEnv)
+                     else pure Nothing
+               _ -> pure Nothing
       lEM $ execLogged "sh"
                        ("./configure" : ("--prefix=" <> fromInstallDir inst)
                         : (maybe mempty (\x -> ["--target=" <> T.unpack x]) (_tvTarget tver) <> ldOverride <> (T.unpack <$> addConfArgs))
                        )
                        (Just $ fromGHCupPath path)
                        "ghc-configure"
-                       Nothing
+                       env
       tmpInstallDest <- lift withGHCupTmpDir
       lEM $ make ["DESTDIR=" <> fromGHCupPath tmpInstallDest, "install"] (Just $ fromGHCupPath path)
       liftE $ catchWarn $ lEM @_ @'[ProcessError] $ darwinNotarization _rPlatform (fromGHCupPath tmpInstallDest)

scripts/bootstrap/bootstrap-haskell

@@ -12,7 +12,6 @@
 #   * BOOTSTRAP_HASKELL_VERBOSE - any nonzero value for more verbose installation
 #   * BOOTSTRAP_HASKELL_GHC_VERSION - the ghc version to install
 #   * BOOTSTRAP_HASKELL_CABAL_VERSION - the cabal version to install
-#   * BOOTSTRAP_HASKELL_CABAL_XDG - don't disable the XDG logic (this doesn't force XDG though, because cabal is confusing)
 #   * BOOTSTRAP_HASKELL_INSTALL_NO_STACK - disable installation of stack
 #   * BOOTSTRAP_HASKELL_INSTALL_NO_STACK_HOOK - disable installation stack ghcup hook
 #   * BOOTSTRAP_HASKELL_INSTALL_HLS - whether to install latest hls
@@ -821,15 +820,6 @@ if [ -z "${BOOTSTRAP_HASKELL_MINIMAL}" ] ; then
 
 	do_cabal_config_init $ask_cabal_config_init_answer
 
-    if [ -z "${BOOTSTRAP_HASKELL_CABAL_XDG}" ] ; then
-        # disable XDG if we can
-        if [ -e "${XDG_CONFIG_HOME:-"$HOME/.config"}/cabal" ] || [ -n "${CABAL_DIR}" ] || [ -n "${CABAL_CONFIG}" ] ; then
-            :
-        else
-            edo mkdir -p "${HOME}/.cabal"
-        fi
-    fi
-
 	edo cabal update --ignore-project
 else # don't install ghc and cabal
 	case "${plat}" in