Add --silent option to silence the build output.

Author: fniephaus

docs/reference-manual/native-image/BuildOutput.md

@@ -220,6 +220,7 @@ Run `native-image --expert-options-all | grep "BuildOutput"` to see all build ou
 -H:±BuildOutputLinks         Show links in build output. Default: + (enabled).
 -H:±BuildOutputPrefix        Prefix build output with '<pid>:<name of binary>'. Default: - (disabled).
 -H:±BuildOutputProgress      Report progress in build output. Default: + (enabled).
+-H:±BuildOutputSilent        Silence build output. Default: - (disabled).
 ```
 
 ### Related Documentation

substratevm/CHANGELOG.md

@@ -6,6 +6,7 @@ This changelog summarizes major changes to GraalVM Native Image.
 * (GR-35721) Remove old build output style and the `-H:±BuildOutputUseNewStyle` option.
 * (GR-39390) (GR-39649) (GR-40033) Red Hat added support for the JFR events `JavaMonitorEnter`, `JavaMonitorWait`, and `ThreadSleep`.
 * (GR-39497) Add `-H:BuildOutputJSONFile=<file.json>` option for [JSON build output](https://github.com/oracle/graal/edit/master/docs/reference-manual/native-image/BuildOutput.md#machine-readable-build-output). Please feel free to provide feedback so that we can stabilize the schema/API.
+* (GR-40170) Add `--silent` option to silence the build output.
 
 ## Version 22.2.0
 * (GR-20653) Re-enable the usage of all CPU features for JIT compilation on AMD64.

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/SubstrateOptions.java

@@ -408,6 +408,10 @@ public Boolean getValue(OptionValues values) {
     /*
      * Build output options.
      */
+    @APIOption(name = "--silent")//
+    @Option(help = "Silence build output", type = OptionType.User)//
+    public static final HostedOptionKey<Boolean> BuildOutputSilent = new HostedOptionKey<>(false);
+
     @Option(help = "Prefix build output with '<pid>:<image name>'", type = OptionType.User)//
     public static final HostedOptionKey<Boolean> BuildOutputPrefix = new HostedOptionKey<>(false);
 

substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/NativeImageSystemIOWrappers.java

@@ -25,6 +25,7 @@
 
 package com.oracle.svm.hosted;
 
+import java.io.OutputStream;
 import java.io.PrintStream;
 import java.util.Objects;
 
@@ -57,6 +58,10 @@ public static NativeImageSystemIOWrappers singleton() {
         return NativeImageSystemClassLoader.singleton().systemIOWrappers;
     }
 
+    public static NativeImageSystemIOWrappers disabled() {
+        return new NativeImageSystemIOWrappersDisabled();
+    }
+
     public PrintStream getOut() {
         return outWrapper.delegate;
     }
@@ -103,4 +108,18 @@ private void maybeInformProgressReporterOnce() {
             }
         }
     }
+
+    private static class NativeImageSystemIOWrappersDisabled extends NativeImageSystemIOWrappers {
+        private static final PrintStream NULL_PRINT_STREAM = new PrintStream(OutputStream.nullOutputStream());
+
+        @Override
+        public PrintStream getOut() {
+            return NULL_PRINT_STREAM;
+        }
+
+        @Override
+        public PrintStream getErr() {
+            return NULL_PRINT_STREAM;
+        }
+    }
 }

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

@@ -174,7 +174,11 @@ public static ProgressReporter singleton() {
     }
 
     public ProgressReporter(OptionValues options) {
-        builderIO = NativeImageSystemIOWrappers.singleton();
+        if (SubstrateOptions.BuildOutputSilent.getValue(options)) {
+            builderIO = NativeImageSystemIOWrappers.disabled();
+        } else {
+            builderIO = NativeImageSystemIOWrappers.singleton();
+        }
 
         if (SubstrateOptions.BuildOutputJSONFile.hasBeenSet(options)) {
             jsonHelper = new ProgressReporterJsonHelper(SubstrateOptions.BuildOutputJSONFile.getValue(options));