Use -XDignore.symbol.file to suppress warnings about sun.misc.Unsafe usage

Author: JoshRosen

pom.xml

@@ -1162,6 +1162,8 @@
               <javacArg>${java.version}</javacArg>
               <javacArg>-target</javacArg>
               <javacArg>${java.version}</javacArg>
+              <!-- This option is needed to suppress warnings from sun.misc.Unsafe usage -->
+              <javacArg>-XDignore.symbol.file</javacArg>
             </javacArgs>
             <!-- The following plugin is required to use quasiquotes in Scala 2.10 and is used
                  by Spark SQL for code generation. -->
@@ -1184,6 +1186,10 @@
             <encoding>UTF-8</encoding>
             <maxmem>1024m</maxmem>
             <fork>true</fork>
+            <compilerArgs>
+              <!-- This option is needed to suppress warnings from sun.misc.Unsafe usage -->
+              <arg>-XDignore.symbol.file</arg>
+            </compilerArgs>
           </configuration>
         </plugin>
         <!-- Surefire runs all Java tests -->

project/SparkBuild.scala

@@ -140,7 +140,9 @@ object SparkBuild extends PomBuild {
     javacOptions in (Compile, doc) ++= {
       val Array(major, minor, _) = System.getProperty("java.version").split("\\.", 3)
       if (major.toInt >= 1 && minor.toInt >= 8) Seq("-Xdoclint:all", "-Xdoclint:-missing") else Seq.empty
-    }
+    },
+    // This option is needed to suppress warnings from sun.misc.Unsafe usage
+    javacOptions in Compile += "-XDignore.symbol.file"
   )
 
   def enable(settings: Seq[Setting[_]])(projectRef: ProjectRef) = {