address comments

Author: dcharkes

pkgs/native_assets_builder/lib/src/build_runner/build_runner.dart

@@ -682,10 +682,6 @@ ${e.message}
     Uri workingDirectory,
     bool includeParentEnvironment,
   ) async {
-    final dartPathFile = File.fromUri(
-      outputDirectory.resolve('../hook.dill.dart_path.txt'),
-    );
-
     final kernelFile = File.fromUri(
       outputDirectory.resolve('../hook.dill'),
     );
@@ -698,18 +694,9 @@ ${e.message}
     final dependenciesHashes = DependenciesHashFile(file: dependenciesHashFile);
     final lastModifiedCutoffTime = DateTime.now();
     var mustCompile = false;
-    if (!await dependenciesHashFile.exists() || !await dartPathFile.exists()) {
+    if (!await dependenciesHashFile.exists()) {
       mustCompile = true;
     } else {
-      final previousDartExecutable =
-          Uri.file(await dartPathFile.readAsString());
-      if (previousDartExecutable != dartExecutable) {
-        mustCompile = true;
-        logger.info(
-          'Recompiling ${scriptUri.toFilePath()}, Dart executable changed.',
-        );
-      }
-
       final outdatedFile =
           await dependenciesHashes.findOutdatedFileSystemEntity();
       if (outdatedFile != null) {
@@ -744,12 +731,11 @@ ${e.message}
         await dependenciesHashes.hashFilesAndDirectories(
       [
         ...dartSources,
-        // If the Dart executable is replaced in-place, recompile.
-        dartExecutable,
+        // If the Dart version changed, recompile.
+        dartExecutable.resolve('../version'),
       ],
       validBeforeLastModified: lastModifiedCutoffTime,
     );
-    await dartPathFile.writeAsString(dartExecutable.toFilePath());
     if (modifiedDuringBuild != null) {
       logger.severe('File modified during build. Build must be rerun.');
     }

pkgs/native_assets_builder/test/build_runner/build_runner_caching_test.dart

@@ -61,6 +61,12 @@ void main() async {
           buildValidator: validateCodeAssetBuildOutput,
           applicationAssetValidator: validateCodeAssetInApplication,
         ))!;
+        final hookUri = packageUri.resolve('hook/build.dart');
+        print(logMessages.join('\n'));
+        expect(
+          logMessages.join('\n'),
+          isNot(contains('Recompiling ${hookUri.toFilePath()}')),
+        );
         expect(
           logMessages.join('\n'),
           contains('Skipping build for native_add'),
@@ -199,7 +205,7 @@ void main() async {
             applicationAssetValidator: validateCodeAssetInApplication,
           ))!;
 
-          final hookUri = packageUri.resolve('hook/').resolve('build.dart');
+          final hookUri = packageUri.resolve('hook/build.dart');
           expect(
             logMessages.join('\n'),
             contains('Recompiling ${hookUri.toFilePath()}'),