🚙 GN: Add write_runtime_deps variable

tools/gn/target_unittest.cc

Index: tools/gn/target_unittest.cc
diff --git a/tools/gn/target_unittest.cc b/tools/gn/target_unittest.cc
index 876c2e3f693790e521466c92a5e45239fe497726..b3a85b75a0d824d28bff94e24065c006a8bfb911 100644
--- a/tools/gn/target_unittest.cc
+++ b/tools/gn/target_unittest.cc
@@ -627,6 +627,53 @@ TEST(Target, WriteFileGeneratedInputs) {
   EXPECT_TRUE(scheduler.GetUnknownGeneratedInputs().empty());
 }
 
+TEST(Target, WriteRuntimeDepsGeneratedInputs) {
+  Scheduler scheduler;
+  TestWithScope setup;
+  Err err;
+
+  SourceFile source_file("//out/Debug/generated.runtime_deps");
+  OutputFile output_file(setup.build_settings(), source_file);
+
+  TestTarget generator(setup, "//foo:generator", Target::EXECUTABLE);
+  generator.set_write_runtime_deps_output(output_file);
+  g_scheduler->AddWriteRuntimeDepsTarget(&generator);
+
+  TestTarget middle_data_dep(setup, "//foo:middle", Target::EXECUTABLE);
+  middle_data_dep.data_deps().push_back(LabelTargetPair(&generator));
+
+  // This target has a generated input and no dependency makes it.
+  TestTarget dep_missing(setup, "//foo:no_dep", Target::EXECUTABLE);
+  dep_missing.sources().push_back(source_file);
+  EXPECT_TRUE(dep_missing.OnResolved(&err));
+  AssertSchedulerHasOneUnknownFileMatching(&dep_missing, source_file);
+  scheduler.ClearUnknownGeneratedInputsAndWrittenFiles();
+
+  // This target has a generated file and we've directly dependended on it.
+  TestTarget dep_present(setup, "//foo:with_dep", Target::EXECUTABLE);
+  dep_present.sources().push_back(source_file);
+  dep_present.private_deps().push_back(LabelTargetPair(&generator));
+  EXPECT_TRUE(dep_present.OnResolved(&err));
+  EXPECT_TRUE(scheduler.GetUnknownGeneratedInputs().empty());
+
+  // This target has a generated file and we've indirectly dependended on it
+  // via data_deps.
+  TestTarget dep_indirect(setup, "//foo:with_dep", Target::EXECUTABLE);
+  dep_indirect.sources().push_back(source_file);
+  dep_indirect.data_deps().push_back(LabelTargetPair(&middle_data_dep));
+  EXPECT_TRUE(dep_indirect.OnResolved(&err));
+  AssertSchedulerHasOneUnknownFileMatching(&dep_indirect, source_file);
+  scheduler.ClearUnknownGeneratedInputsAndWrittenFiles();
+
+  // This target has a generated file and we've directly dependended on it
+  // via data_deps.
+  TestTarget data_dep_present(setup, "//foo:with_dep", Target::EXECUTABLE);
+  data_dep_present.sources().push_back(source_file);
+  data_dep_present.data_deps().push_back(LabelTargetPair(&generator));
+  EXPECT_TRUE(data_dep_present.OnResolved(&err));
+  EXPECT_TRUE(scheduler.GetUnknownGeneratedInputs().empty());
+}
+
 // Tests that intermediate object files generated by binary targets are also
 // considered generated for the purposes of input checking. Above, we tested
 // the failure cases for generated inputs, so here only test .o files that are