Add option for native exe

Author: loic-peron-inetum-public

lib/src/standalone.dart

@@ -32,6 +32,11 @@ import 'utils.dart';
 /// This defaults to [name].
 final standaloneName = InternalConfigVariable.fn<String>(() => name.value);
 
+/// Whether to build native exe.
+///
+/// This defaults to `false`.
+final useNative = InternalConfigVariable.fn<bool>(() => false);
+
 /// For each executable entrypoint in [executables], builds a script snapshot
 /// to `build/${executable}.snapshot`.
 ///
@@ -95,6 +100,7 @@ void addStandaloneTasks() {
 
   freezeSharedVariables();
   standaloneName.freeze();
+  useNative.freeze();
 
   addTask(GrinderTask('pkg-compile-snapshot',
       taskFunction: () => _compileSnapshot(release: true),
@@ -121,7 +127,7 @@ void addStandaloneTasks() {
           taskFunction: () => _buildPackage(platform),
           description:
               'Build a standalone package for ${platform.toHumanString()}.',
-          depends: platform.useNative
+          depends: platform.useNative || useNative.value
               ? ['pkg-compile-native']
               : ['pkg-compile-snapshot'])
   };
@@ -133,7 +139,9 @@ void addStandaloneTasks() {
         for (var MapEntry(key: platform, value: task) in tasks.entries)
           // Omit Fuchsia tasks because we can't run those unless we're actually
           // running on Fuchsia ourselves.
-          if (!platform.os.isFuchsia || platform.isCurrent) task.name
+          // Omit cross-platform tasks with native exe because we can't run those
+          // unless we're actually on the target platform.
+          if (!(platform.os.isFuchsia || useNative.value) || platform.isCurrent) task.name
       ]));
 }