Support more configurability in GN toolchains

tools/gn/ninja_target_writer_unittest.cc

 // Copyright 2014 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 <sstream>
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/ninja_target_writer.h"
+#include "tools/gn/target.h"
 #include "tools/gn/test_with_scope.h"
 
 namespace {
 
 class TestingNinjaTargetWriter : public NinjaTargetWriter {
  public:
   TestingNinjaTargetWriter(const Target* target,
                            const Toolchain* toolchain,
                            std::ostream& out)
-      : NinjaTargetWriter(target, toolchain, out) {
+      : NinjaTargetWriter(target, out) {
   }
 
   virtual void Run() OVERRIDE {}
 
   // Make this public so the test can call it.
   std::string WriteInputDepsStampAndGetDep(
       const std::vector<const Target*>& extra_hard_deps) {
     return NinjaTargetWriter::WriteInputDepsStampAndGetDep(extra_hard_deps);
   }
 };
 
 }  // namespace
 
 TEST(NinjaTargetWriter, WriteInputDepsStampAndGetDep) {
   TestWithScope setup;
 
   // Make a base target that's a hard dep (action).
   Target base_target(setup.settings(), Label(SourceDir("//foo/"), "base"));
   base_target.set_output_type(Target::ACTION);
+  base_target.SetToolchain(setup.toolchain());
   base_target.action_values().set_script(SourceFile("//foo/script.py"));
 
   // Dependent target that also includes a source prerequisite (should get
   // included) and a source (should not be included).
   Target target(setup.settings(), Label(SourceDir("//foo/"), "target"));
   target.set_output_type(Target::EXECUTABLE);
+  target.SetToolchain(setup.toolchain());
   target.inputs().push_back(SourceFile("//foo/input.txt"));
   target.sources().push_back(SourceFile("//foo/source.txt"));
   target.deps().push_back(LabelTargetPair(&base_target));
 
   // Dependent action to test that action sources will be treated the same as
   // inputs.
   Target action(setup.settings(), Label(SourceDir("//foo/"), "action"));
   action.set_output_type(Target::ACTION);
+  action.SetToolchain(setup.toolchain());
   action.action_values().set_script(SourceFile("//foo/script.py"));
   action.sources().push_back(SourceFile("//foo/action_source.txt"));
   action.deps().push_back(LabelTargetPair(&target));
 
   base_target.OnResolved();
   target.OnResolved();
   action.OnResolved();
 
   // Input deps for the base (should be only the script itself).
   {
@@ skipping 40 matching lines @@
 TEST(NinjaTargetWriter, WriteInputDepsStampAndGetDepWithToolchainDeps) {
   TestWithScope setup;
 
   // Toolchain dependency. Here we make a target in the same toolchain for
   // simplicity, but in real life (using the Builder) this would be rejected
   // because it would be a circular dependency (the target depends on its
   // toolchain, and the toolchain depends on this target).
   Target toolchain_dep_target(setup.settings(),
                               Label(SourceDir("//foo/"), "setup"));
   toolchain_dep_target.set_output_type(Target::ACTION);
+  toolchain_dep_target.SetToolchain(setup.toolchain());
+  toolchain_dep_target.OnResolved();
   setup.toolchain()->deps().push_back(LabelTargetPair(&toolchain_dep_target));
 
   // Make a binary target
   Target target(setup.settings(), Label(SourceDir("//foo/"), "target"));
   target.set_output_type(Target::EXECUTABLE);
+  target.SetToolchain(setup.toolchain());
+  target.OnResolved();
 
   std::ostringstream stream;
   TestingNinjaTargetWriter writer(&target, setup.toolchain(), stream);
   std::string dep =
       writer.WriteInputDepsStampAndGetDep(std::vector<const Target*>());
 
   EXPECT_EQ(" | obj/foo/target.inputdeps.stamp", dep);
   EXPECT_EQ("build obj/foo/target.inputdeps.stamp: stamp "
                 "obj/foo/setup.stamp\n",
             stream.str());
 }