Added FastR compilation on JDK9 to gate.

ci.hocon

@@ -7,6 +7,7 @@
 java7 : {name : oraclejdk, version : "7",    platformspecific: true}
 # java 8 must be a jvmci enabled variant
 java8 : {name : labsjdk, version : "8-jvmci-latest", platformspecific: true}
+java9 : {name : labsjdk, version : "9-ea+168", platformspecific: true}
 
 java8Downloads : {
   downloads : {
@@ -17,6 +18,16 @@ java8Downloads : {
   }
 }
 
+java9Downloads : {
+  downloads : {
+    EXTRA_JAVA_HOMES : { pathlist :[
+      ${java7}
+      ${java8}
+    ]}
+    JAVA_HOME : ${java9}
+  }
+}
+
 logfiles : [
     "fastr_errors.log"
     "results.json"
@@ -123,6 +134,12 @@ gateTestManagedLinux: ${common} {
   ]
 }
 
+gateTestJava9Linux : ${java9Downloads} ${gateTestCommon} {
+  downloads : {
+    JAVA_HOME : ${java9Downloads.downloads.JAVA_HOME}
+    EXTRA_JAVA_HOMES : ${java9Downloads.downloads.EXTRA_JAVA_HOMES}
+  }
+}
 
 # This performs a number of "style" checks on the code to ensure it confirms to the project standards.
 
@@ -171,4 +188,5 @@ builds = [
   ${rbcheck}                  {capabilities : [linux, amd64],  targets : [gate], name: "gate-rbcheck-linux-amd64"}
   ${internalPkgtest}          {capabilities : [linux, amd64],  targets : [gate], name: "gate-internal-pkgtest-linux-amd64"}
   ${gateTestManagedLinux}     {capabilities : [linux, amd64, fast],  targets : [gate], name: "gate-test-managed-linux-amd64"}
+  ${gateTestJava9Linux}       {capabilities : [linux, amd64, fast],  targets : [gate], name: "gate-test-java9-linux-amd64"}
 ]

com.oracle.truffle.r.test/src/com/oracle/truffle/r/test/builtins/TestBuiltin_weekdaysDate.java

@@ -4,7 +4,7 @@
  * http://www.gnu.org/licenses/gpl-2.0.html
  *
  * Copyright (c) 2014, Purdue University
- * Copyright (c) 2014, 2016, Oracle and/or its affiliates
+ * Copyright (c) 2014, 2017, Oracle and/or its affiliates
  *
  * All rights reserved.
  */
@@ -13,6 +13,7 @@ package com.oracle.truffle.r.test.builtins;
 import org.junit.Test;
 
 import com.oracle.truffle.r.test.TestBase;
+import java.util.Locale;
 
 // Checkstyle: stop line length check
 
@@ -20,6 +21,11 @@ public class TestBuiltin_weekdaysDate extends TestBase {
 
     @Test
     public void testweekdaysDate1() {
+        // Explicit locale setting is a workaround to run this test on JDK9.
+        // Otherwise the test was returning "Thu" instead of "Thursday"
+        // due to JDK bug 8130845.
+        Locale.setDefault(Locale.ENGLISH);
+
         assertEval("argv <- structure(list(x = structure(16352, class = 'Date')),     .Names = 'x');do.call('weekdays.Date', argv)");
     }
 }