armv7 by nomeata: https://ghc.haskell.org/trac/ghc/ticket/8976#comment:12
arm64 backport of https://ghc.haskell.org/trac/ghc/ticket/9673#comment:28 (erikd)

--- ghc-7.8.4/aclocal.m4.24~	2015-04-01 04:48:39.961193022 -0400
+++ ghc-7.8.4/aclocal.m4	2015-04-01 04:50:19.708203082 -0400
@@ -553,6 +553,14 @@
         $3="$$3 -D_HPUX_SOURCE"
         $5="$$5 -D_HPUX_SOURCE"
         ;;
+    arm*)
+        # On arm, link using gold
+        $3="$$3 -fuse-ld=gold"
+        ;;
+    aarch64*)
+        # On arm, link using gold
+        $3="$$3 -fuse-ld=gold"
+        ;;
     esac
 
     # If gcc knows about the stack protector, turn it off.
--- ghc-7.8.4/configure.ac~	2014-12-22 14:08:24.000000000 -0500
+++ ghc-7.8.4/configure.ac	2015-04-22 00:08:54.646110535 -0400
@@ -587,7 +587,18 @@
 dnl ** Which ld to use?
 dnl --------------------------------------------------------------
 FP_ARG_WITH_PATH_GNU_PROG([LD], [ld], [ld])
-LdCmd="$LD"
+case $target in
+arm*linux* | aarch64*linux*)
+	# Arm requires use of the binutils ld.gold linker.
+	# This case should catch at least arm-unknown-linux-gnueabihf and
+	# arm-linux-androideabi.
+	FP_ARG_WITH_PATH_GNU_PROG([LD_GOLD], [ld.gold], [ld.gold])
+	LdCmd="$LD_GOLD"
+	;;
+*)
+	LdCmd="$LD"
+	;;
+esac
 AC_SUBST([LdCmd])
 
 dnl ** Which nm to use?