🚙 GN: Add write_runtime_deps variable

tools/gn/target_generator.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "tools/gn/target_generator.h"
 
 #include <stddef.h>
 
 #include "tools/gn/action_target_generator.h"
 #include "tools/gn/binary_target_generator.h"
@@ skipping 40 matching lines @@
 
   if (!FillTestonly())
     return;
 
   if (!FillAssertNoDeps())
     return;
 
   if (!Visibility::FillItemVisibility(target_, scope_, err_))
     return;
 
+  if (!FillWriteRuntimeDeps())
+    return;
+
   // Do type-specific generation.
   DoRun();
 }
 
 // static
 void TargetGenerator::GenerateTarget(Scope* scope,
                                      const FunctionCallNode* function_call,
                                      const std::vector<Value>& args,
                                      const std::string& output_type,
                                      Err* err) {
@@ skipping 305 matching lines @@
 
 bool TargetGenerator::FillGenericDeps(const char* var_name,
                                       LabelTargetVector* dest) {
   const Value* value = scope_->GetValue(var_name, true);
   if (value) {
     ExtractListOfLabels(*value, scope_->GetSourceDir(),
                         ToolchainLabelForScope(scope_), dest, err_);
   }
   return !err_->has_error();
 }
+
+bool TargetGenerator::FillWriteRuntimeDeps() {
+  const Value* value = scope_->GetValue(variables::kWriteRuntimeDeps, true);
+  if (!value)
+    return true;
+
+  // Compute the file name and make sure it's in the output dir.
+  SourceFile source_file = scope_->GetSourceDir().ResolveRelativeFile(
+      *value, err_, GetBuildSettings()->root_path_utf8());
+  if (err_->has_error())
+    return false;
+  if (!EnsureStringIsInOutputDir(GetBuildSettings()->build_dir(),
+          source_file.value(), value->origin(), err_))
+    return false;
+  OutputFile output_file(GetBuildSettings(), source_file);
+  target_->set_write_runtime_deps_output(output_file);
+
+  g_scheduler->AddWriteRuntimeDepsTarget(target_);
+  return true;
+}