make/autoconf/basic.m4

8248238: Adding Windows support to OpenJDK on AArch64

Summary: Adding Windows support for AArch64

Contributed-by: Ludovic Henry <luhenry@microsoft.com>, Monica Beckwith <monica.beckwith@microsoft.com>
Reviewed-by:

@@ -298,10 +298,20 @@
   AC_MSG_CHECKING([for extra path])
   AC_MSG_RESULT([$EXTRA_PATH])
 ])
 
 ###############################################################################
+# Evaluates platform specific overrides for build devkit variables.
+# $1: Name of variable
+AC_DEFUN([BASIC_EVAL_BUILD_DEVKIT_VARIABLE],
+[
+  if test "x[$]$1" = x; then
+    eval $1="\${$1_${OPENJDK_BUILD_CPU}}"
+  fi
+])
+
+###############################################################################
 AC_DEFUN_ONCE([BASIC_SETUP_OUTPUT_DIR],
 [
 
   AC_ARG_WITH(conf-name, [AS_HELP_STRING([--with-conf-name],
       [use this as the name of the configuration @<:@generated from important configuration options@:>@])],