Enable BuildOutputPrefix in GraalVmSVMNativeImageBuildTask.

Author: fniephaus

sdk/mx.sdk/mx_sdk_vm_impl.py

@@ -2180,6 +2180,7 @@ def get_build_args(self):
         build_args = [
             '--macro:' + GraalVmNativeProperties.macro_name(self.subject.native_image_config),
             '-H:NumberOfThreads=' + str(self.parallelism),
+            '-H:+BuildOutputPrefix',
         ]
         if self.subject.native_image_config.is_polyglot:
             build_args += ["--macro:truffle", "--language:all"]

substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/reporting/ProgressReporter.java

@@ -134,12 +134,7 @@ public ProgressReporter(OptionValues options) {
         if (isEnabled) {
             Timer.disablePrinting();
         }
-        if (SubstrateOptions.BuildOutputPrefix.hasBeenSet(options)) {
-            usePrefix = SubstrateOptions.BuildOutputPrefix.getValue(options);
-        } else {
-            // Drop mx detection after enabling prefix in gates (GR-35238).
-            usePrefix = IS_CI && System.getenv("MX_HOME") != null;
-        }
+        usePrefix = SubstrateOptions.BuildOutputPrefix.getValue(options);
         boolean enableColors = !IS_CI;
         if (SubstrateOptions.BuildOutputColorful.hasBeenSet(options)) {
             enableColors = SubstrateOptions.BuildOutputColorful.getValue(options);