--- a/make/autoconf/platform.m4	Thu Apr 05 11:18:39 2018 -0700
+++ b/make/autoconf/platform.m4	Fri Apr 06 03:53:28 2018 +0200
@@ -262,9 +262,12 @@
   OPENJDK_TARGET_CPU_ARCH="$VAR_CPU_ARCH"
   OPENJDK_TARGET_CPU_BITS="$VAR_CPU_BITS"
   OPENJDK_TARGET_CPU_ENDIAN="$VAR_CPU_ENDIAN"
+  OPENJDK_TARGET_OS_UPPERCASE=`$ECHO $OPENJDK_TARGET_OS | $TR 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
+
   AC_SUBST(OPENJDK_TARGET_OS)
   AC_SUBST(OPENJDK_TARGET_OS_TYPE)
   AC_SUBST(OPENJDK_TARGET_OS_ENV)
+  AC_SUBST(OPENJDK_TARGET_OS_UPPERCASE)
   AC_SUBST(OPENJDK_TARGET_CPU)
   AC_SUBST(OPENJDK_TARGET_CPU_ARCH)
   AC_SUBST(OPENJDK_TARGET_CPU_BITS)