[Tizen] Temporarily cherrypick 449c49e

Author: jason-simmons

ci/licenses_golden/licenses_flutter

@@ -1888,6 +1888,7 @@ FILE: ../../../flutter/shell/platform/embedder/embedder.cc
 FILE: ../../../flutter/shell/platform/embedder/embedder.h
 FILE: ../../../flutter/shell/platform/embedder/embedder_engine.cc
 FILE: ../../../flutter/shell/platform/embedder/embedder_engine.h
+FILE: ../../../flutter/shell/platform/embedder/embedder_exports.lst
 FILE: ../../../flutter/shell/platform/embedder/embedder_external_texture_gl.cc
 FILE: ../../../flutter/shell/platform/embedder/embedder_external_texture_gl.h
 FILE: ../../../flutter/shell/platform/embedder/embedder_external_texture_metal.h

shell/platform/embedder/BUILD.gn

@@ -369,8 +369,12 @@ shared_library("flutter_engine_library") {
 
   output_name = "flutter_engine"
 
+  ldflags = []
   if (is_mac && !embedder_for_target) {
-    ldflags = [ "-Wl,-install_name,@rpath/FlutterEmbedder.framework/$_framework_binary_subpath" ]
+    ldflags += [ "-Wl,-install_name,@rpath/FlutterEmbedder.framework/$_framework_binary_subpath" ]
+  }
+  if (is_linux) {
+    ldflags += [ "-Wl,--version-script=" + rebase_path("embedder_exports.lst") ]
   }
 
   deps = [ ":embedder" ]

shell/platform/embedder/embedder_exports.lst

@@ -0,0 +1,17 @@
+# Copyright 2013 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.
+
+# Linker script that exports the minimal symbols required for the embedder library
+
+{
+  global:
+    Flutter*;
+    __Flutter*;
+    kDartIsolateSnapshotData;
+    kDartIsolateSnapshotInstructions;
+    kDartVmSnapshotData;
+    kDartVmSnapshotInstructions;
+  local:
+    *;
+};

testing/symbols/verify_exported.dart

@@ -57,10 +57,15 @@ void main(List<String> arguments) {
       .where((String s) => s.startsWith('ios_'));
   final Iterable<String> androidReleaseBuilds = releaseBuilds
       .where((String s) => s.startsWith('android_'));
+  final Iterable<String> hostReleaseBuilds = releaseBuilds
+      .where((String s) => s.startsWith('host_'));
 
   int failures = 0;
   failures += _checkIos(outPath, nmPath, iosReleaseBuilds);
   failures += _checkAndroid(outPath, nmPath, androidReleaseBuilds);
+  if (Platform.isLinux) {
+    failures += _checkLinux(outPath, nmPath, hostReleaseBuilds);
+  }
   print('Failing checks: $failures');
   exit(failures);
 }
@@ -237,6 +242,40 @@ int _checkAndroid(String outPath, String nmPath, Iterable<String> builds) {
   return failures;
 }
 
+int _checkLinux(String outPath, String nmPath, Iterable<String> builds) {
+  int failures = 0;
+  for (final String build in builds) {
+    final String libFlutter = p.join(outPath, build, 'libflutter_engine.so');
+    if (!File(libFlutter).existsSync()) {
+      print('SKIPPING: $libFlutter does not exist.');
+      continue;
+    }
+    final ProcessResult nmResult = Process.runSync(nmPath, <String>['-gUD', libFlutter]);
+    if (nmResult.exitCode != 0) {
+      print('ERROR: failed to execute "nm -gUD $libFlutter":\n${nmResult.stderr}');
+      failures++;
+      continue;
+    }
+    final List<NmEntry> entries = NmEntry.parse(nmResult.stdout as String).toList();
+    for (final NmEntry entry in entries) {
+      if (entry.type != 'T' && entry.type != 'R') {
+        print('ERROR: $libFlutter exports an unexpected symbol type: ($entry)');
+        print(' Library has $entries.');
+        failures++;
+        break;
+      }
+      if (!(entry.name.startsWith('Flutter')
+            || entry.name.startsWith('__Flutter'))) {
+        print('ERROR: $libFlutter exports an unexpected symbol name: ($entry)');
+        print(' Library has $entries.');
+        failures++;
+        break;
+      }
+    }
+  }
+  return failures;
+}
+
 class NmEntry {
   NmEntry._(this.address, this.type, this.name);
 
@@ -250,4 +289,7 @@ class NmEntry {
       return NmEntry._(parts[0], parts[1], parts.last);
     });
   }
+
+  @override
+  String toString() => '$name: $type';
 }