Simple sanity check of cross compilation build and compiler execution.

backend.native/tests/build.gradle

@@ -1766,6 +1766,20 @@ task driver_opt(type: RunDriverKonanTest) {
     flags = ["-opt"]
 }
 
+// Check that cross-compilation completes successfully. We can't run such 
+// binaries, but we verify that the compiler has been built, operational 
+// and accepts the -target flag, resulting in a successful compilation.
+task driver_cross(type: RunDriverKonanTest) {
+    goldValue = "Hello, world!\n"
+    source = "runtime/basic/hello0.kt"
+    run = false
+    if (isLinux()) {
+        flags = ["-target", "raspberrypi"]
+    } else if (isMac()) {
+        flags = ["-target", "iphone"]
+    }
+}
+
 // Enable when deserialization for default arguments is fixed.
 task inline_defaultArgs_linkTest(type: LinkKonanTest) {
     goldValue = "122\n47\n"

buildSrc/src/main/groovy/org/jetbrains/kotlin/KonanTest.groovy

@@ -262,6 +262,12 @@ class RunKonanTest extends KonanTest {
 // from IDEA. Use the RunKonanTest instead.
 @ParallelizableTask
 class RunDriverKonanTest extends KonanTest {
+
+    RunDriverKonanTest() {
+        super()
+        dependsOn(project.rootProject.tasks['cross_dist'])
+    }
+
     void compileTest(List<String> filesToCompile, String exe) {
         runCompiler(filesToCompile, exe, flags?:[])
     }