[flutter_tools] add --dart-define option for fuchsia build (#55715)

AUTHORS

@@ -52,3 +52,4 @@ Alek Åström <alek.astrom@gmail.com>
 Efthymios Sarpmpanis <e.sarbanis@gmail.com>
 Cédric Wyss <cedi.wyss@gmail.com>
 Michel Feinstein <michel@feinstein.com.br>
+Michael Lee <ckmichael8@gmail.com>

packages/flutter_tools/lib/src/commands/build_fuchsia.dart

@@ -19,6 +19,7 @@ class BuildFuchsiaCommand extends BuildSubCommand {
   BuildFuchsiaCommand({bool verboseHelp = false}) {
     addTreeShakeIconsFlag();
     usesTargetOption();
+    usesDartDefineOption();
     addBuildModeFlags(verboseHelp: verboseHelp);
     argParser.addOption(
       'runner-source',

packages/flutter_tools/lib/src/fuchsia/fuchsia_kernel_compiler.dart

@@ -56,28 +56,7 @@ class FuchsiaKernelCompiler {
       '--packages', '$multiRootScheme:///$relativePackagesFile',
       '--output', globals.fs.path.join(outDir, '$appName.dil'),
       '--component-name', appName,
-
-      // AOT/JIT:
-      if (buildInfo.usesAot) ...<String>['--aot', '--tfa']
-      else ...<String>[
-        '--no-link-platform',
-        '--split-output-by-packages',
-        '--manifest', manifestPath
-      ],
-
-      // debug, profile, jit release, release:
-      if (buildInfo.isDebug) '--embed-sources'
-      else '--no-embed-sources',
-
-      if (buildInfo.isProfile) '-Ddart.vm.profile=true',
-      if (buildInfo.mode.isRelease) '-Ddart.vm.release=true',
-      '-Ddart.developer.causal_async_stacks=${buildInfo.isDebug}',
-
-      // Use bytecode and drop the ast in JIT release mode.
-      if (buildInfo.isJitRelease) ...<String>[
-        '--gen-bytecode',
-        '--drop-ast',
-      ],
+      ...getBuildInfoFlags(buildInfo: buildInfo, manifestPath: manifestPath)
     ];
 
     flags += <String>[
@@ -103,4 +82,50 @@ class FuchsiaKernelCompiler {
       throwToolExit('Build process failed');
     }
   }
+
+  /// Provide flags that are affected by [BuildInfo]
+  @visibleForTesting
+  static List<String> getBuildInfoFlags({
+    @required BuildInfo buildInfo,
+    @required String manifestPath,
+  }) {
+    return <String>[
+      // AOT/JIT:
+      if (buildInfo.usesAot) ...<String>[
+        '--aot',
+        '--tfa'
+      ] else ...<String>[
+        '--no-link-platform',
+        '--split-output-by-packages',
+        '--manifest',
+        manifestPath
+      ],
+
+      // debug, profile, jit release, release:
+      if (buildInfo.isDebug)
+        '--embed-sources'
+      else
+        '--no-embed-sources',
+
+      if (buildInfo.isProfile) ...<String>[
+        '-Ddart.vm.profile=true',
+        '-Ddart.vm.product=false',
+      ],
+
+      if (buildInfo.mode.isRelease) ...<String>[
+        '-Ddart.vm.profile=false',
+        '-Ddart.vm.product=true',
+      ],
+      '-Ddart.developer.causal_async_stacks=${buildInfo.isDebug}',
+
+      // Use bytecode and drop the ast in JIT release mode.
+      if (buildInfo.isJitRelease) ...<String>[
+        '--gen-bytecode',
+        '--drop-ast',
+      ],
+
+      for (final String dartDefine in buildInfo.dartDefines)
+        '-D$dartDefine',
+    ];
+  }
 }

packages/flutter_tools/test/general.shard/fuchsia/fuchsia_kernel_compiler_test.dart

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter_tools/src/build_info.dart';
+import 'package:flutter_tools/src/fuchsia/fuchsia_kernel_compiler.dart';
+
+import '../../src/common.dart';
+
+void main() {
+  group('Fuchsia Kernel Compiler', () {
+    test('provide correct flags for release mode', () {
+      expect(
+        FuchsiaKernelCompiler.getBuildInfoFlags(
+          buildInfo: BuildInfo.release,
+          manifestPath: '',
+        ),
+        allOf(<Matcher>[
+          contains('-Ddart.vm.profile=false'),
+          contains('-Ddart.vm.product=true'),
+        ]));
+    });
+
+    test('provide correct flags for profile mode', () {
+      expect(
+        FuchsiaKernelCompiler.getBuildInfoFlags(
+          buildInfo: BuildInfo.profile,
+          manifestPath: '',
+        ),
+        allOf(<Matcher>[
+          contains('-Ddart.vm.profile=true'),
+          contains('-Ddart.vm.product=false'),
+        ]),
+      );
+    });
+
+    test('provide correct flags for custom dart define', () {
+      expect(
+        FuchsiaKernelCompiler.getBuildInfoFlags(
+          buildInfo: const BuildInfo(
+            BuildMode.debug,
+            null,
+            treeShakeIcons: true,
+            dartDefines: <String>['abc=efg'],
+          ),
+          manifestPath: ''),
+          allOf(<Matcher>[
+            contains('-Dabc=efg'),
+          ]));
+    });
+  });
+}