Only apply -XDignore.symbol.file flag in unsafe project.

Author: JoshRosen

pom.xml

@@ -1162,8 +1162,6 @@
               <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. -->
@@ -1186,10 +1184,6 @@
             <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

@@ -140,9 +140,7 @@ 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) = {
@@ -165,6 +163,9 @@ object SparkBuild extends PomBuild {
       x => enable(MimaBuild.mimaSettings(sparkHome, x))(x)
     }
 
+  /* Unsafe settings */
+  enable(Unsafe.settings)(unsafe)
+
   /* Enable Assembly for all assembly projects */
   assemblyProjects.foreach(enable(Assembly.settings))
 
@@ -218,6 +219,13 @@ object SparkBuild extends PomBuild {
 
 }
 
+object Unsafe {
+  lazy val settings = Seq(
+    // This option is needed to suppress warnings from sun.misc.Unsafe usage
+    javacOptions in Compile += "-XDignore.symbol.file"
+  )
+}
+
 object Flume {
   lazy val settings = sbtavro.SbtAvro.avroSettings
 }

unsafe/pom.xml

@@ -65,5 +65,29 @@
   <build>
     <outputDirectory>target/scala-${scala.binary.version}/classes</outputDirectory>
     <testOutputDirectory>target/scala-${scala.binary.version}/test-classes</testOutputDirectory>
+    <pluginManagement>
+      <plugins>
+        <plugin>
+          <groupId>net.alchim31.maven</groupId>
+          <artifactId>scala-maven-plugin</artifactId>
+          <configuration>
+            <javacArgs>
+              <!-- This option is needed to suppress warnings from sun.misc.Unsafe usage -->
+              <javacArg>-XDignore.symbol.file</javacArg>
+            </javacArgs>
+          </configuration>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-compiler-plugin</artifactId>
+          <configuration>
+            <compilerArgs>
+              <!-- This option is needed to suppress warnings from sun.misc.Unsafe usage -->
+              <arg>-XDignore.symbol.file</arg>
+            </compilerArgs>
+          </configuration>
+        </plugin>
+      </plugins>
+    </pluginManagement>
   </build>
 </project>