Index: b/make/autoconf/flags.m4
===================================================================
--- a/make/autoconf/flags.m4
+++ b/make/autoconf/flags.m4
@@ -246,6 +246,7 @@ AC_DEFUN_ONCE([FLAGS_PRE_TOOLCHAIN],
         test "x$OPENJDK_TARGET_CPU_ARCH" = xppc; then
       MACHINE_FLAG="-m${OPENJDK_TARGET_CPU_BITS}"
     fi
+    case "$host" in *x32) MACHINE_FLAG=;; esac
   fi
 
   # FIXME: global flags are not used yet...
@@ -318,11 +319,8 @@ AC_DEFUN([FLAGS_SETUP_TOOLCHAIN_CONTROL]
   AC_SUBST(COMPILER_COMMAND_FILE_FLAG)
   AC_SUBST(COMPILER_BINDCMD_FILE_FLAG)
 
-  # Check that the compiler supports -mX (or -qX on AIX) flags
-  # Set COMPILER_SUPPORTS_TARGET_BITS_FLAG to 'true' if it does
-  FLAGS_COMPILER_CHECK_ARGUMENTS(ARGUMENT: [${COMPILER_TARGET_BITS_FLAG}${OPENJDK_TARGET_CPU_BITS}],
-      IF_TRUE: [COMPILER_SUPPORTS_TARGET_BITS_FLAG=true],
-      IF_FALSE: [COMPILER_SUPPORTS_TARGET_BITS_FLAG=false])
+  # Don't run the -mX check and set this always to false, or else x32 gets passed -m32
+  COMPILER_SUPPORTS_TARGET_BITS_FLAG=false
   AC_SUBST(COMPILER_SUPPORTS_TARGET_BITS_FLAG)
 
   if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then