diff -r 54eb4c29ece4 -r 7ba4e17574e0 common/autoconf/build-performance.m4
--- a/common/autoconf/build-performance.m4	Wed Mar 21 09:19:00 2018 -0700
+++ b/common/autoconf/build-performance.m4	Thu Apr 05 07:59:52 2018 -0700
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -261,7 +261,7 @@
 
   if test "x$ENABLE_PRECOMPH" = xyes; then
     # Check that the compiler actually supports precomp headers.
-    if test "x$GCC" = xyes; then
+    if test "x$TOOLCHAIN_TYPE" = xgcc; then
       AC_MSG_CHECKING([that precompiled headers work])
       echo "int alfa();" > conftest.h
       $CXX -x c++-header conftest.h -o conftest.hpp.gch 2>&AS_MESSAGE_LOG_FD >&AS_MESSAGE_LOG_FD